Enjoyed the video. I have a Magnavox made in 2012 and after putting in the tape the cam motor won't stop moving and that causes the cam to make a ticking sound until the power shuts off. After turning power back on it ejects the tape. The tape won't play, rewind or fast forward. Is it the LED?
You make it look so easy! :( i cant get the plastic bit off in order to take the pinch roller off. The tape got stuck and tape is everywhere but got it under control, just need to take the tape off thats wrapped round near the pinch roller pleaseee help! Thank you
I can't say I ever saw any of those, but then the date of manufacture is almost exactly six months to the day that I left the industry - given that I had been working for a Sony Centre for the three years prior to leaving, it is entirely possible that there was a UK variant of this one. In some ways, I wish they were that simple to work on in my day - especially some of the more 'unique' machines (Philips Charly mech anyone??). Thanks for another great video :)
Yes there were some pretty strange machines on the market. I was in the biz from 1984 and threw in the towel in mid 2003 and got myself a real job. A nice cushy union job with half decent pay, medical / dental and a pension.
I have a PV-9662 and it uses this exact same mechanism. What’s odd about mine is there is a capacitor in the hifi circuit that is bulged but it doesn't seem to be affecting the operation Although mine does seem to have symptoms of being pretty worn out because obviously the previous owner (which the person I bought it from said it belonged to a papermill) seemed to have used it quite a bit and I've put many hours of use on it in the 6 months I've had it but overall it seems quite reliable. I will eventually take it completely apart and see if I can get it working a little bit better but I think I'll leave it alone for now.
Thanks for doing this teardown video. I have one of these VCR players, and it works great, except the tape door does not open when you press eject. I have to hold it open manually. Is this something I can fix easily?
@@12voltvids Is it something that can be fixed? I haven't taken it apart yet, but if it can't be fixed, I won't bother. Still works, just have to hold the door open to eject tapes.
Thanks for the video. I have a dead Mitsubishi HS-U748 which has a very similar looking mechanism, except it appears not to have the small black mode switch you showed in your video here. Problems I have are related to FF/RW, very weak, will not make it to the end of the tape, very often will not even start. I am going to take a look at the clutch and associated gears. What grease do you recommend for this area? Thanks very much
I have Fuji VCR form 2000 and it works still but only on mono sound but not Hi-Fi you just get static out of one channel and clear audio out of the other channel.
Need to scope the hifi head output from the preamp and see how it looks. Could be a number of things, work hifi heads, head preamp, or local interference.The FM carriers for VHS operate in the 1300 and 1700 KHz range.The left channel 1300 and the right 1700.Now as you can see this is right in the middle of the AM radio broadcast band for the left audio carrier. If you have an AM radio station in the 1290 to 1310 KHZ range it is totally possible for the transmitted signal to get into the head preamp, and totally swamp out the signals recovered from the tape.This would result in total noise. We used to have a radio station here in my area that broadcast on 1320, and we would get hi-fi decks in from people that lived in close proximity to that station towers that would complain of noise on their tapes, yet the machine worked flawlessly. I was sent to the house after about the 5th time back for this new machine, and I noted the broadcast tower out in a field about 1/2 mile away. I took some aluminum foil and wrapped the VCR in foil, and the noise went away. Better machines had a metal shield around the heads, cheaper machines did not, and this was a cheap plastic cabinet machine that was picking up all this interference.
I got a RCA VR622HF VCR from my mom, and I watched a tape, and something unexpectedly happened, the tape got eaten, not the mode switch, I accidentally pushed the tape in, it loaded, and now... the whole phase is stuck!!!!! I even checked the strip, it was under neath the cassette, cut it, and it still would not come out!!!! What do you think happened?
hi i have a question i have a dvd recorder lasted years done all the power supply caps but has a dvd drive fault the spindle broke in the centre and went bang the clips snapped of i found an pc lg drive to replace the motor in it but the drives no good anyway as not reading RAM disk but other disk ok or templamental I replaced the drive years back did fix the problem before but only stopped after the bang this happened with the last drive 2 did the same problem is there a supplier you can recommend as its a great machine did the power supply rebuild i got last drive of ebay but no more in stock many thanks LG RHT399H
DVD recorders are tricky, as even though many use what looks like a PC dvd recorder, they usually have specific firmware on them. I remember attempting to swap a DVD drive out on a DVD recorder that had an internal HDD that was full of personal stuff. Just the act of unplugging DVD drive from the IDE cable triggered a tamper detect routine (the board had a battery backup that kept this running when unplugged) that once the power was reconnected proceeded to wipe all the content from the drive. My boss had to worm his way out of that one. I do remember that we never accepted another DVD recorder with HDD in again. All future units coming in were referred to Panasonic and Sony service, so they could deal with upset clients that learned that their recordings were trashed.
many thanks for your help again scary the frmware is diffrent on the drives and plug to pc connection i ordered a second drive by part no. i was hoping to purchase a new RAM drive and swap out the motors to the pc drive motor as they are the same drives but diffrent as you say firmware and board because the motor was built better surprisingly metal because 2 drives i got stopped working after they went bang with a disk in them i was all grounded with mat and wrist strap as i do pc and know about ESD discharge but noticed both drives suffer with a rubbish platter made out of cheap plastic and the clips broke and the disk shot up with the platter on the magnet but i noticed the pc ones were built alot better ever since this happened they got funny on disks it happened 2 the first then the second one did the same so not sure how it crashed the board to stop it reading disks properly strange i changed the motor and the laser as it was the same part no. aswell so it spins ok just ejects out verious disks any type dvd ram dvdr or rw this happend the first drive replaced and worked fine even did a firmware upgrade so defintely know its that just need another drive thanks for your help i love the vids keep them coming great info i will stop fixing newer ones i stick with PC and laptops and mac know alot more about them lolll and got the tools
We never saw EP in Europe, indeed it took quite a while before LP machines (1/2 speed) started filtering through. The Beta machines were similar, single-speed units were still commonplace in 1985.
That is because PAL machines were already bandwidth compromised.The head drum was already running slower, as was the tape speed. The same tape that in SP delivered 2 hours on the faster NTSC machines ran for 3 hours on PAL. (E-180 was the exact same tape as a T-120 on NTSC)Sl when they went to an LP speed, that was the exact same tape speed as the SLP/EP speed on our machines as far as tape speed goes but the drum is still running slower, and needing to record more information to boot.
One general question (not regarding PAL or NTSC standard): when you record at slower speed (LP) does the speed of the drum is also slower or it remains constant on both SP and LP ?
That's a great question. The drum speed is constant regardless of tape speed. The video tracks are just recorded closer together. Narrower heads are used for the slower speeds. That is why better machines have 4 video heads. 2 are cut to the 68 micron track width of SP and 2 for 22 microns for the EP speed. LP track width is 34 microns, but is recorded by the narrower 22 micron heads. Now 2 head machines that had the EP speed were fitted only with 22 micron heads, and they would actually perform with no better video quality in SP than EP, and actually worse quality when the SP recording was played on a 4 head machine because there would be a skinny little video track laid down, and a bunch of blank space and then the next track. This black space resulted in more noise when a 3 head SP recording was played on a 4 head VCR.
Thank you for detailed response, I appreciate that! I have few more questions: 1 - What is the actual purpose of the control track? 2 - Is control track used for capstan speed control or for the drum "phase control" to align the heads to the video tracks? 3 - Can a vcr play correctly if control track is missing? I also know that modern vcrs use control track for linear tape counter, but old ones, I see no point, because we have manual tracking control. Even my vcr which has "automatic tracking control" also offer the "manual" adjusting.
The control track is very important. It tells the capstan and drum servos where the frame is. There are 2 fields that make up each frame video. On NTSC there are 60 fields, and on PAL there are 50. There are 30 frames and 25 frames respectively. At the beginning of each even field the control track pulses positive. On the start of each odd field it pluses negative These positive and negative pulses on playback are used to syncronize the servos so the video heads start at the correct track. It is also used to determine the tape speed as it will be exactly 30 Hz or 25 Hz depending on the system, and the real time counter also keys off this by counting the pulses. If you have no control track, tracking will be impossible. I plan to do a video demonstrating the control track, and what happens when there is no control track. Stay tuned. I have many more VCR and Analog TV videos planned, as these ones seem to draw the most interest.
VCR parts. Good luck with that! I have no idea where one could get any parts for a VCR these days unless someone is sitting on old stock, like me. I have a brand new upper cylinder for an AG1980. That head was worth 200 new, and someone some day will want it.
@@12voltvids Hi, I took the mode switch off the board to clean it instead of just taking the cover off, is it repairable before i throw out my VCR? Its the same one as this video. thanks.
i see you give a lot of love to the japan panasonic i have the not made in japan panasonic . i had it since 2001 4 head hifi sound and it still works like new with no issues so i guess i dont understand the diff between the two beside the outside look the same with only a few diff parts in the inside of the unite 😄😆
Dave, Not only did panasonic always have the lp speed on their machines, the 1990s funai vcrs would be capable of recording in the lp speed. I have a 1997 or 98 symphonic SL2840 and it can record in lp mode.
Panasonic developed the lp speed. Jvc never used it they went to ep. Jvc never considered the lp speed an official speed. In fact when svhs was developed anyone making svhs could not include lp record on it.
i have allot of vhs tape from 1990 to 2003..when i play back the tape now i get jitters and noisy picture ..but.. in beta from 1989 to 1990 i get better from it picture...why this happen?1
Beta had a larger head drum, and the transports were generally more refined as they had fewer moving parts as far as the tape threading mechanism goes, and that generally resulted in better time base from the tape than VHS.Time base errors result in jitter, and if the TV monitor can't correct them, you get an unstable picture. Of course it could be capacitors drying up in the power supply. Many VHS machines uses switching power supplies that once the caps dry up you get high frequency ripple. Most Beta machines uses a big linear power supply.
My DVD recorder has tons of different speeds. HQ+ HQ HSP SP LP SLP EP SEP and then it has a bunch of modes that let you manually set the bit rate to make custom time so example say you use a 4GB disc instead of using the bit rate of SP witch is roughly 2 hours give or take 5 minutes usually can get 2 hours 5 minutes out of SP but you can set the bit rate to match the size of the disc so example you have something that's 1 hour 45 minutes instead of using SP you can manually adjust the bit rate to fill the disc it's kinda cool. The recorder also lets you record in PCM Audio about 1 MB in size or stick with the Dolby Digital 2.0 stereo.
I have several DVD recorders, and a few of my Panasonic units I can set variable bit rate. If say I need to record 2:47, I can set the start and stop tomes to equal the time I need to get on the disk, and it will pick a data rate between the SP and LP speed to completely fill the disk. Quality is better than recording it in the 4 hour LP speed, almost as good as the SP speed. Same goes for say I need to squeeze 1 hour and 10 minutes. It will be almost in the XP quality, better than the SP speed as far as bit rate goes,Oh the fun and games of DVD recording.
@12voltvids Thanks for this thorough tear down! I have an RCA VR624HF and the internals are identical to the Panasonic PV9450. The only difference is the front plate, where the RCA has LED indicators instead of an LCD display, and an extra daughterboard for a composite input at the front. At ruclips.net/video/4tVtHUjRGTM/видео.html on the pendulum gear assembly, is the gear on the right supposed to be a bit stiff to turn? The one on the left spins freely, but the one on the right is spring loaded axially, but I notice the end of the spring is dragging and skipping on the circumference of the gear, adding resistance and making some noise. I tried spraying a bit of lubricant in there as the gear doesn't look like it can be disassembled, but it doesn't change much. Other than that, my VCR is now working again after cleaning the mode switch! I also cleaned the unit (I think someone sprayed the internals with WD40...) and lubricating gears and shafts.
I TRIED REMOVING THE HEAD TOP TO GET THE JUNK UNDERNEATH OUT OF IT AND NOW IT SHOWS STATIC:( WHAT DID I DO WRONG I AM SO MAD I JUST WANTED TO CLEAN IT AND NOW LOOK I TRIED CLEANING THE VIDEO HEAD, NOTHING!!!!!!!!!! GRRRRRRRRRRRRR:( ALTHOUGH IT SHOWS THE PICTURE A LITTLE WHEN I PUT IT ON PAUSE. ALSO REMOVED HEAD CLEANING WHEEL. MODEL NO. PV 8661. HAD IT SINCE HALLOWEEN 2013 OVER 6 YEARS SORRY ABOUT THE ANGRY COMMENT I AM SO TRIGGERED I JUST WANT TO CRY BUT I WILL TRY NOT TO. PLEASE I HOPE I CAN FIX IT:(
Smashing teardown :-D Yes it does look simple to repair, i never saw that type ;-( Im afraid im a bit too much of a stick in the mud, i like the older machines with a seperate hinged board and a chassis that never needs to be removed to do repairs. Lsi chips seem good untill it goes wrong, then the video is scrap!, not clever at all :-(. Its possible i saw all the cheap nasty ones, they were just a waste of video heads.
Ahh i see, i was too busy repairing vcr's to think about the name. In fact the old cheap Orion white pcb machines of the 80's were easy to access. I just like the earlier machines, not superb performance but lasted well. The single pcb machines with a switchmode psu on the same pcb marked the end of quality, junk that wasnt worth the effort of repairing. Sorry thats just my odd opinion :-(
The old heavy duty machines were great work horses for sure, but they also cost a fortune to make, and mass market means that the costs need to be brought down. Discrete components increases complexity, and reduces reliability over LSI as far as the electronics go. Remember all those composite ceramic glass modules covered in epoxy. Argh, horrible design, and very problematic. Some of the worst designs as far as reliability goes were the so called industrial AG series, with the 2 motor design, and the solenoid that controlled a clutch to load, unload and thread the tape using the capstan motor. Lots of problems, then there was the first generation of Sony mechanism, you know the one that the blue gear breaks on. Another disaster waiting to happen.If you look at this mechanism, by comparison it is really well designed, and even though it looks really cheap, the mechanism really didn't give a lot of problems. The main cam gear sometimes broke, and that is usually caused by use of wet cleaning tapes (Alsop I am looking at you) and dirty mode switches that cause the motor to fire at random when there is not tape in it.That is why I opened the switch and cleaned it up. Electronic wise these units are among the most reliable, however when an electronic problem arises and it is buried in one of the LSI chips it is a throw away.
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Enjoyed the video. I have a Magnavox made in 2012 and after putting in the tape the cam motor won't stop moving and that causes the cam to make a ticking sound until the power shuts off. After turning power back on it ejects the tape. The tape won't play, rewind or fast forward. Is it the LED?
You make it look so easy! :( i cant get the plastic bit off in order to take the pinch roller off. The tape got stuck and tape is everywhere but got it under control, just need to take the tape off thats wrapped round near the pinch roller pleaseee help! Thank you
I have one of these 9450's and curious about the size info of the reel drive belt?
Just repaired one. Would not play rewind or Fast forward. Turns out the 2 reel sensors had cracked soldering. Easy fix.
I can't say I ever saw any of those, but then the date of manufacture is almost exactly six months to the day that I left the industry - given that I had been working for a Sony Centre for the three years prior to leaving, it is entirely possible that there was a UK variant of this one. In some ways, I wish they were that simple to work on in my day - especially some of the more 'unique' machines (Philips Charly mech anyone??).
Thanks for another great video :)
Yes there were some pretty strange machines on the market. I was in the biz from 1984 and threw in the towel in mid 2003 and got myself a real job. A nice cushy union job with half decent pay, medical / dental and a pension.
I have a PV-9662 and it uses this exact same mechanism. What’s odd about mine is there is a capacitor in the hifi circuit that is bulged but it doesn't seem to be affecting the operation Although mine does seem to have symptoms of being pretty worn out because obviously the previous owner (which the person I bought it from said it belonged to a papermill) seemed to have used it quite a bit and I've put many hours of use on it in the 6 months I've had it but overall it seems quite reliable. I will eventually take it completely apart and see if I can get it working a little bit better but I think I'll leave it alone for now.
you know your stuff for sure, thank you ..
I have that exact model...still use it regularly.
Thanks for doing this teardown video. I have one of these VCR players, and it works great, except the tape door does not open when you press eject. I have to hold it open manually. Is this something I can fix easily?
Its either the lever that opens the door or the door is broken.
@@12voltvids Is it something that can be fixed? I haven't taken it apart yet, but if it can't be fixed, I won't bother. Still works, just have to hold the door open to eject tapes.
@@andbenschyes i did that to my pv 8661 vcr when i didnt open the door when putting the front cover back on.
Thanks for the video. I have a dead Mitsubishi HS-U748 which has a very similar looking mechanism,
except it appears not to have the small black mode switch you showed in your video here. Problems I have are related
to FF/RW, very weak, will not make it to the end of the tape, very often will not even start. I am going to take a look
at the clutch and associated gears. What grease do you recommend for this area?
Thanks very much
I have Fuji VCR form 2000 and it works still but only on mono sound but not Hi-Fi you just get static out of one channel and clear audio out of the other channel.
Worn heads or bad caps on the head pre-amp circuit.
Need to scope the hifi head output from the preamp and see how it looks. Could be a number of things, work hifi heads, head preamp, or local interference.The FM carriers for VHS operate in the 1300 and 1700 KHz range.The left channel 1300 and the right 1700.Now as you can see this is right in the middle of the AM radio broadcast band for the left audio carrier. If you have an AM radio station in the 1290 to 1310 KHZ range it is totally possible for the transmitted signal to get into the head preamp, and totally swamp out the signals recovered from the tape.This would result in total noise. We used to have a radio station here in my area that broadcast on 1320, and we would get hi-fi decks in from people that lived in close proximity to that station towers that would complain of noise on their tapes, yet the machine worked flawlessly. I was sent to the house after about the 5th time back for this new machine, and I noted the broadcast tower out in a field about 1/2 mile away. I took some aluminum foil and wrapped the VCR in foil, and the noise went away. Better machines had a metal shield around the heads, cheaper machines did not, and this was a cheap plastic cabinet machine that was picking up all this interference.
@@12voltvids damn, you're a smart dude. I love your videos. I love the vcr. Had lots of fun in those days. But I'm amazed at how much you know!
I got a RCA VR622HF VCR from my mom, and I watched a tape, and something unexpectedly happened, the tape got eaten, not the mode switch, I accidentally pushed the tape in, it loaded, and now... the whole phase is stuck!!!!! I even checked the strip, it was under neath the cassette, cut it, and it still would not come out!!!! What do you think happened?
hi i have a question i have a dvd recorder lasted years done all the power supply caps but has a dvd drive fault the spindle broke in the centre and went bang the clips snapped of i found an pc lg drive to replace the motor in it but the drives no good anyway as not reading RAM disk but other disk ok or templamental I replaced the drive years back did fix the problem before but only stopped after the bang this happened with the last drive 2 did the same problem is there a supplier you can recommend as its a great machine did the power supply rebuild i got last drive of ebay but no more in stock many thanks LG RHT399H
DVD recorders are tricky, as even though many use what looks like a PC dvd recorder, they usually have specific firmware on them. I remember attempting to swap a DVD drive out on a DVD recorder that had an internal HDD that was full of personal stuff. Just the act of unplugging DVD drive from the IDE cable triggered a tamper detect routine (the board had a battery backup that kept this running when unplugged) that once the power was reconnected proceeded to wipe all the content from the drive. My boss had to worm his way out of that one. I do remember that we never accepted another DVD recorder with HDD in again. All future units coming in were referred to Panasonic and Sony service, so they could deal with upset clients that learned that their recordings were trashed.
many thanks for your help again scary the frmware is diffrent on the drives and plug to pc connection i ordered a second drive by part no. i was hoping to purchase a new RAM drive and swap out the motors to the pc drive motor as they are the same drives but diffrent as you say firmware and board because the motor was built better surprisingly metal because 2 drives i got stopped working after they went bang with a disk in them i was all grounded with mat and wrist strap as i do pc and know about ESD discharge but noticed both drives suffer with a rubbish platter made out of cheap plastic and the clips broke and the disk shot up with the platter on the magnet but i noticed the pc ones were built alot better ever since this happened they got funny on disks it happened 2 the first then the second one did the same so not sure how it crashed the board to stop it reading disks properly strange i changed the motor and the laser as it was the same part no. aswell so it spins ok just ejects out verious disks any type dvd ram dvdr or rw this happend the first drive replaced and worked fine even did a firmware upgrade so defintely know its that just need another drive thanks for your help i love the vids keep them coming great info i will stop fixing newer ones i stick with PC and laptops and mac know alot more about them lolll and got the tools
We never saw EP in Europe, indeed it took quite a while before LP machines (1/2 speed) started filtering through. The Beta machines were similar, single-speed units were still commonplace in 1985.
That is because PAL machines were already bandwidth compromised.The head drum was already running slower, as was the tape speed. The same tape that in SP delivered 2 hours on the faster NTSC machines ran for 3 hours on PAL. (E-180 was the exact same tape as a T-120 on NTSC)Sl when they went to an LP speed, that was the exact same tape speed as the SLP/EP speed on our machines as far as tape speed goes but the drum is still running slower, and needing to record more information to boot.
One general question (not regarding PAL or NTSC standard): when you record at slower speed (LP) does the speed of the drum is also slower or it remains constant on both SP and LP ?
That's a great question. The drum speed is constant regardless of tape speed.
The video tracks are just recorded closer together. Narrower heads are used for the slower speeds. That is why better machines have 4 video heads. 2 are cut to the 68 micron track width of SP and 2 for 22 microns for the EP speed. LP track width is 34 microns, but is recorded by the narrower 22 micron heads. Now 2 head machines that had the EP speed were fitted only with 22 micron heads, and they would actually perform with no better video quality in SP than EP, and actually worse quality when the SP recording was played on a 4 head machine because there would be a skinny little video track laid down, and a bunch of blank space and then the next track. This black space resulted in more noise when a 3 head SP recording was played on a 4 head VCR.
Thank you for detailed response, I appreciate that!
I have few more questions:
1 - What is the actual purpose of the control track?
2 - Is control track used for capstan speed control or for the drum "phase control" to align the heads to the video tracks?
3 - Can a vcr play correctly if control track is missing?
I also know that modern vcrs use control track for linear tape counter, but old ones, I see no point, because we have manual tracking control. Even my vcr which has "automatic tracking control" also offer the "manual" adjusting.
The control track is very important. It tells the capstan and drum servos where the frame is. There are 2 fields that make up each frame video. On NTSC there are 60 fields, and on PAL there are 50.
There are 30 frames and 25 frames respectively.
At the beginning of each even field the control track pulses positive.
On the start of each odd field it pluses negative
These positive and negative pulses on playback are used to syncronize the servos so the video heads start at the correct track.
It is also used to determine the tape speed as it will be exactly 30 Hz or 25 Hz depending on the system, and the real time counter also keys off this by counting the pulses.
If you have no control track, tracking will be impossible.
I plan to do a video demonstrating the control track, and what happens when there is no control track.
Stay tuned. I have many more VCR and Analog TV videos planned, as these ones seem to draw the most interest.
Never heard of EP in the U.K., only SP and LP. Most older VCRs only had SP with most newer ones from the early 90s onwards having, LP as well.
Very nice! What if you have a noisy head on a ENG camera, lube a bearing?
If the noise is from a head bearing you are probably out of luck. Most of the motor bearings are sealed up on camcorders.
no replacement parts available for these anymore? I picked one up at a garage sale and it does work well, a nice machine.
VCR parts. Good luck with that! I have no idea where one could get any parts for a VCR these days unless someone is sitting on old stock, like me. I have a brand new upper cylinder for an AG1980. That head was worth 200 new, and someone some day will want it.
@@12voltvids Hi, I took the mode switch off the board to clean it instead of just taking the cover off, is it repairable before i throw out my VCR? Its the same one as this video. thanks.
i see you give a lot of love to the japan panasonic i have the not made in japan panasonic . i had it since 2001 4 head hifi sound and it still works like new with no issues so i guess i dont understand the diff between the two beside the outside look the same with only a few diff parts in the inside of the unite 😄😆
Dave, Not only did panasonic always have the lp speed on their machines, the 1990s funai vcrs would be capable of recording in the lp speed. I have a 1997 or 98 symphonic SL2840 and it can record in lp mode.
Panasonic developed the lp speed. Jvc never used it they went to ep. Jvc never considered the lp speed an official speed. In fact when svhs was developed anyone making svhs could not include lp record on it.
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i have allot of vhs tape from 1990 to 2003..when i play back the tape now i get jitters and noisy picture ..but.. in beta from 1989 to 1990 i get better from it picture...why this happen?1
Beta had a larger head drum, and the transports were generally more refined as they had fewer moving parts as far as the tape threading mechanism goes, and that generally resulted in better time base from the tape than VHS.Time base errors result in jitter, and if the TV monitor can't correct them, you get an unstable picture. Of course it could be capacitors drying up in the power supply. Many VHS machines uses switching power supplies that once the caps dry up you get high frequency ripple. Most Beta machines uses a big linear power supply.
My DVD recorder has tons of different speeds. HQ+ HQ HSP SP LP SLP EP SEP and then it has a bunch of modes that let you manually set the bit rate to make custom time so example say you use a 4GB disc instead of using the bit rate of SP witch is roughly 2 hours give or take 5 minutes usually can get 2 hours 5 minutes out of SP but you can set the bit rate to match the size of the disc so example you have something that's 1 hour 45 minutes instead of using SP you can manually adjust the bit rate to fill the disc it's kinda cool. The recorder also lets you record in PCM Audio about 1 MB in size or stick with the Dolby Digital 2.0 stereo.
I have several DVD recorders, and a few of my Panasonic units I can set variable bit rate. If say I need to record 2:47, I can set the start and stop tomes to equal the time I need to get on the disk, and it will pick a data rate between the SP and LP speed to completely fill the disk. Quality is better than recording it in the 4 hour LP speed, almost as good as the SP speed. Same goes for say I need to squeeze 1 hour and 10 minutes. It will be almost in the XP quality, better than the SP speed as far as bit rate goes,Oh the fun and games of DVD recording.
@12voltvids Thanks for this thorough tear down! I have an RCA VR624HF and the internals are identical to the Panasonic PV9450. The only difference is the front plate, where the RCA has LED indicators instead of an LCD display, and an extra daughterboard for a composite input at the front.
At ruclips.net/video/4tVtHUjRGTM/видео.html on the pendulum gear assembly, is the gear on the right supposed to be a bit stiff to turn? The one on the left spins freely, but the one on the right is spring loaded axially, but I notice the end of the spring is dragging and skipping on the circumference of the gear, adding resistance and making some noise. I tried spraying a bit of lubricant in there as the gear doesn't look like it can be disassembled, but it doesn't change much.
Other than that, my VCR is now working again after cleaning the mode switch! I also cleaned the unit (I think someone sprayed the internals with WD40...) and lubricating gears and shafts.
Thank you just saved me $200.
great info ... oh my friend....thanks
thanks
I TRIED REMOVING THE HEAD TOP TO GET THE JUNK UNDERNEATH OUT OF IT AND NOW IT SHOWS STATIC:( WHAT DID I DO WRONG I AM SO MAD I JUST WANTED TO CLEAN IT AND NOW LOOK I TRIED CLEANING THE VIDEO HEAD, NOTHING!!!!!!!!!! GRRRRRRRRRRRRR:( ALTHOUGH IT SHOWS THE PICTURE A LITTLE WHEN I PUT IT ON PAUSE. ALSO REMOVED HEAD CLEANING WHEEL. MODEL NO. PV 8661. HAD IT SINCE HALLOWEEN 2013 OVER 6 YEARS SORRY ABOUT THE ANGRY COMMENT I AM SO TRIGGERED I JUST WANT TO CRY BUT I WILL TRY NOT TO. PLEASE I HOPE I CAN FIX IT:(
Probably i knocked the timing mark for the head drum off.
Smashing teardown :-D
Yes it does look simple to repair, i never saw that type ;-(
Im afraid im a bit too much of a stick in the mud, i like the older machines with a seperate hinged board and a chassis that never needs to be removed to do repairs.
Lsi chips seem good untill it goes wrong, then the video is scrap!, not clever at all :-(.
Its possible i saw all the cheap nasty ones, they were just a waste of video heads.
I think that's the Z chassis mechanism.
Did you mean the cheap ones?
That's the last generation of Panasonic chassis, after the very complicated G and K mechanisms
Ahh i see, i was too busy repairing vcr's to think about the name.
In fact the old cheap Orion white pcb machines of the 80's were easy to access.
I just like the earlier machines, not superb performance but lasted well.
The single pcb machines with a switchmode psu on the same pcb marked the end of quality, junk that wasnt worth the effort of repairing.
Sorry thats just my odd opinion :-(
The old heavy duty machines were great work horses for sure, but they also cost a fortune to make, and mass market means that the costs need to be brought down. Discrete components increases complexity, and reduces reliability over LSI as far as the electronics go. Remember all those composite ceramic glass modules covered in epoxy. Argh, horrible design, and very problematic. Some of the worst designs as far as reliability goes were the so called industrial AG series, with the 2 motor design, and the solenoid that controlled a clutch to load, unload and thread the tape using the capstan motor. Lots of problems, then there was the first generation of Sony mechanism, you know the one that the blue gear breaks on. Another disaster waiting to happen.If you look at this mechanism, by comparison it is really well designed, and even though it looks really cheap, the mechanism really didn't give a lot of problems. The main cam gear sometimes broke, and that is usually caused by use of wet cleaning tapes (Alsop I am looking at you) and dirty mode switches that cause the motor to fire at random when there is not tape in it.That is why I opened the switch and cleaned it up. Electronic wise these units are among the most reliable, however when an electronic problem arises and it is buried in one of the LSI chips it is a throw away.