What a coincidence. I also faced power supply issues with 2 VHS machines I bought recently and I made a video asking for advice. Of course, they are not vintage, valuable and rare like your Betamax unit!
I'll have to check your video out. The HF950 is certainly quite a machine but saving any of these machines regardless of format keeps them from eventually fading away into history.
I accidentally did this on an SLO-340 portable. Blew about a dozen diodes and probably some transistors on the main system control board. There's like 60 diodes just on the system control board and I had to check each one.
Ouch! That's a lot of damage. In the end all that blew from the incorrect polarity on the HF950 was the three N5 semicondutor fuses - I found out today that the standby issue was the original fault with it before the accidental polarity swap.
Hey there Mr. Betabyte. Been a while, but like a friend that shows up only when he has problems, you know where I am headed, I have a broken Aiwa AV-50M, that I got from EBay. Are you familiar with them? If so I need to find the spur gear that goes on the motor that drives the idler wheel. I have the service manual but the exploded views do not identify the part. Where can I find this info? From my measurements it is 6 mm in the outer diameter. There is a brass inset that it slides into on the shaft, so it does not slide onto the shaft itself. Well, I don’t know if it’s brass but metal of some kind and I have seen plastic spur gears that have that. Do I need to find one with the metal insert or willl it work just by obtaining a spur gear that fits around it? Thank you and keep on fixing.
That sounds like a very interesting machine and I don't think I've ever seen an Aiwa Betamax. Is yours a PAL unit or NTSC? You'd probably get away with an all plastic gear but I'm assuming it has some twisting movement in use. Could you take some pictures of the gear and the surround mechanism and email them to me at mrbetabyte@gmail.com and I'll see if I can help locate one?
Good day! I am your subscriber, I have been repairing SL-HF950 MK2 for 4 years.. Input 2 receives a square wave from IC301. And at input 3 there is a constant 3.4V. although there should also be a meander. As far as I understand, the summation of these meanders sets the voltage at the output of the op-amp to adjust the Dram speed. Question. Why does input 3 receive constant 3.4V when IC301 is working? What motivates her to do this? Please tell me what else can I see?
@@MrBetaByteSS-50. On error amp pin 2 1.8 VDC, on pin 3 3.4 VDC(???). Symptom- slightly slower rotating drum... It is impossible to start recording - the machine goes to stop
What a coincidence. I also faced power supply issues with 2 VHS machines I bought recently and I made a video asking for advice. Of course, they are not vintage, valuable and rare like your Betamax unit!
I'll have to check your video out. The HF950 is certainly quite a machine but saving any of these machines regardless of format keeps them from eventually fading away into history.
I accidentally did this on an SLO-340 portable. Blew about a dozen diodes and probably some transistors on the main system control board. There's like 60 diodes just on the system control board and I had to check each one.
Ouch! That's a lot of damage. In the end all that blew from the incorrect polarity on the HF950 was the three N5 semicondutor fuses - I found out today that the standby issue was the original fault with it before the accidental polarity swap.
Hey there Mr. Betabyte. Been a while, but like a friend that shows up only when he has problems, you know where I am headed, I have a broken Aiwa AV-50M, that I got from EBay. Are you familiar with them? If so I need to find the spur gear that goes on the motor that drives the idler wheel. I have the service manual but the exploded views do not identify the part. Where can I find this info? From my measurements it is 6 mm in the outer diameter. There is a brass inset that it slides into on the shaft, so it does not slide onto the shaft itself. Well, I don’t know if it’s brass but metal of some kind and I have seen plastic spur gears that have that. Do I need to find one with the metal insert or willl it work just by obtaining a spur gear that fits around it? Thank you and keep on fixing.
That sounds like a very interesting machine and I don't think I've ever seen an Aiwa Betamax. Is yours a PAL unit or NTSC? You'd probably get away with an all plastic gear but I'm assuming it has some twisting movement in use. Could you take some pictures of the gear and the surround mechanism and email them to me at mrbetabyte@gmail.com and I'll see if I can help locate one?
Lo has conseguido reparar
I did and it didn't turn out too bad a repair either.
@@MrBetaByte mi padre me lo está reparando también
Good day!
I am your subscriber, I have been repairing SL-HF950 MK2 for 4 years..
Input 2 receives a square wave from IC301. And at input 3 there is a constant 3.4V. although there should also be a meander. As far as I understand, the summation of these meanders sets the voltage at the output of the op-amp to adjust the Dram speed. Question. Why does input 3 receive constant 3.4V when IC301 is working? What motivates her to do this?
Please tell me what else can I see?
What board are you referring too? What is the symptom/ fault with the machine? Is the 3.4v measured as AC or DC?
@@MrBetaByteSS-50. On error amp pin 2 1.8 VDC, on pin 3 3.4 VDC(???). Symptom- slightly slower rotating drum... It is impossible to start recording - the machine goes to stop