Repaired a power supply on a TNC150 today (same PS as 145). Changed all electrolytic capacitor. The machine had to be switched on/off several times to start up correct and the parameters was lost (even with fresh batteries). Now it is working.
Hey Connor, great video and glad you got it working. I have the exact same machine and my CRT only has a Horizontal line, would you know how i go about correcting it?
I'm a bit confused, am I missing something ?..... Expensive DAC's ? They can be produced with a simple R2R ladder......... ADC's on the other hand require some opamps and a resistor network, they would be the expensive ones.... correct me if I'm wrong please.
I think you are fortunate that those PFD's are so bright after all this time. They look great, I wonder if the machine hasn't been off for quite a bit of time.
The batteries stop the parameters being lost on switch off. On the TNC355 there is a ni-cad on the board which will hold all the parameters good while you change the batteries..not sure on the 145..
That CRT whining is probably due windings knocked loose, so they can vibrate in deflection field. Usually putting some coating over them helps to reduce noise. And as other have said, those old ROMs are in the end of their road, you should read them in case they start to corrupt. Worst thing is to lose all ROM data in machine, as getting copy of that would be nearly impossible. All other parts are easily replaceable. Otherwise, really nice old-school unit. CNC machines have some serious lifecycle, in some cases from father to son :)
Connor. Would greatly appreciate a run through the workings of the TNC 145 SMPS power supply. I have 2nr that are proving a devil to bring back to life. Thanks
You have to press CE to enable the servo drives..then press start to home each axis. The power interupted message is standard on all Heidenhains after switch on..it just means power stop mode. The TNC145 doesn't close the servo loop until each axis is homed.
I'm loving this video Connor, those waveforms across the PSU's are the worst I have seen in a long time but the scope display resolution isn't given so only a visual of the displayed waveform is what I can go on. The noise content in some of the waveforms are horrendous.... Decoupling Cap's.... get rid
Sparkgaps are very common on the neck boards of CRTs... Seeing as how the CRT driver is not on the actual neck board (due to it being just a socket) but on the main board, those spark gaps are likely part of the CRT drive circuit. Also, could that funky looking AC Sine wave be due to bad power factor?
Dear, I have the same problem as you with tnc 135. My idea is to use it only as coordinate reader, do you have any idea to disconnect function to override NC? Sincerely Adrian Iacovelli of Argentina
LOL... around 50 minutes, you test some voltages at double video speed.... I thought back to the film Crimson Tide when the engineer had to work at double time to fix the communication device... It seemed like you were up against the clock to get the fault......
You are correct, but in truth that hardly ever presents it self as a problem because physical dimensions forces us to use the closer value anyway. but yes you are correct.
Looks like the whine is probably due to bad compensation, from shitty caps being the wrong value and dangerously high ESR. Shotgun them all and it's probably good.
+Tim Williams The ripple on those rails is almost as bad as cheap Chinese ATX supplies I have seen where the no-name caps have all but given up the ghost.
All old Heidenhain controllers boots a display a message saying "power intrupeded" . Press CE key on the controller. Then press feed button a large green colour button . Then press cycle three times for each axis. If it has no problem the the X,Y & Z value will be displayed .
+Dan Frederiksen Except for the fact that it _is_ relevant - think about the number of these still deployed and working. Reworking one of these from scratch is rather non-trivial.
Repaired a power supply on a TNC150 today (same PS as 145). Changed all electrolytic capacitor. The machine had to be switched on/off several times to start up correct and the parameters was lost (even with fresh batteries). Now it is working.
Fortunately my headphones are doing an excellent job with the high frequency noise. Helps me to appreciate your suffering :-)
Great video, thumbs up!
Hey Connor, great video and glad you got it working. I have the exact same machine and my CRT only has a Horizontal line, would you know how i go about correcting it?
I'd refresh all of those uv erasable eproms. They end to slowly erase themselves and it's just good practice refreshing them every decade or so.
I'm a bit confused, am I missing something ?..... Expensive DAC's ?
They can be produced with a simple R2R ladder.........
ADC's on the other hand require some opamps and a resistor network, they would be the expensive ones.... correct me if I'm wrong please.
I think you are fortunate that those PFD's are so bright after all this time.
They look great, I wonder if the machine hasn't been off for quite a bit of time.
The batteries stop the parameters being lost on switch off. On the TNC355 there is a ni-cad on the board which will hold all the parameters good while you change the batteries..not sure on the 145..
Looking forward to Part 2..
That CRT whining is probably due windings knocked loose, so they can vibrate in deflection field. Usually putting some coating over them helps to reduce noise. And as other have said, those old ROMs are in the end of their road, you should read them in case they start to corrupt. Worst thing is to lose all ROM data in machine, as getting copy of that would be nearly impossible. All other parts are easily replaceable. Otherwise, really nice old-school unit. CNC machines have some serious lifecycle, in some cases from father to son :)
Connor. Would greatly appreciate a run through the workings of the TNC 145 SMPS power supply. I have 2nr that are proving a devil to bring back to life. Thanks
Better read those EEPROMs before dementia sets in.
You can just vacuum pot the offending transformer if the power supply doesn't shut up.
You have to press CE to enable the servo drives..then press start to home each axis. The power interupted message is standard on all Heidenhains after switch on..it just means power stop mode. The TNC145 doesn't close the servo loop until each axis is homed.
I'm loving this video Connor, those waveforms across the PSU's are the worst I have seen in a long time but the scope display resolution isn't given so only a visual of the displayed waveform is what I can go on. The noise content in some of the waveforms are horrendous.... Decoupling Cap's.... get rid
It's been a few years since I worked on a Bridgeport with a Heidenhain TNC145.
Sparkgaps are very common on the neck boards of CRTs... Seeing as how the CRT driver is not on the actual neck board (due to it being just a socket) but on the main board, those spark gaps are likely part of the CRT drive circuit.
Also, could that funky looking AC Sine wave be due to bad power factor?
+Doom2pro Yeah, secondary side AC waveform is due to leakage (iso + power trans). That's a very typical waveform.
Dear,
I have the same problem as you with tnc 135.
My idea is to use it only as coordinate reader, do you have any idea to disconnect function to override NC?
Sincerely
Adrian Iacovelli of Argentina
Very intrusted video, thaks! Where can I find any schema for this type of controller?
Wow..... where did you find that dial gauge (1:03)...looks really old school..... Maplin can sell you a digital version for £15... I saw it today.
That TO3 on the side of the CRT PCB looks like a Line Output Transistor, -- Horizontal Oscilator and EHT generator.
The TNC 355 uses the same encoders Rod 450(10mm shaft) or Rod 456(6mm shaft) are common ones.
You ever think about livestreaming this sort of thing? I'd watch :P
MERRY CHRISTMAS M8!
Also thanks for the video!
I'm a bit of a modern power supply guy and seeing that power supply in the back of the controller made me feel ill.
It's the control voltage of 24V missing . The control voltage to PLC . Nothing wrong with the tnc 145 controller.
LOL... around 50 minutes, you test some voltages at double video speed.... I thought back to the film Crimson Tide when the engineer had to work at double time to fix the communication device... It seemed like you were up against the clock to get the fault......
The TDA 2593 chip... got to be the field generator (Vertical ) for the CRT..... 50Hz (60 Hz for US)
+Michael Hawthorne This is even weirder - It's 47 Hz. Because normal refresh rates are for chumps, or something.
A whole lot of recappint to do!
On the voltage side i never had any problems going above the original caps.
+maxsnts A good rule of thumb is to go one level higher on voltage, but no more, as higher voltage caps have higher ESR, which isn't so good.
You are correct, but in truth that hardly ever presents it self as a problem because physical dimensions forces us to use the closer value anyway. but yes you are correct.
+maxsnts Those older Capacitors likely had higher ESR brand new than an equivalent newer Capacitor.
At first I was like "WTF blue LEDs in something that old" and the you showed they are VFDs.I feel stupid.
I had a capacitor blow the cover off just like that on a Gigabyte computer motherboard once.
Looks like the whine is probably due to bad compensation, from shitty caps being the wrong value and dangerously high ESR. Shotgun them all and it's probably good.
+Tim Williams The ripple on those rails is almost as bad as cheap Chinese ATX supplies I have seen where the no-name caps have all but given up the ghost.
"2000hr 105C" my ass! (but in the present case, they're probably over 20000 hr, so death is to be expected :) )
hi I have repaired one of them
Want to assist in a TNC 150?
How do I contact you?
Kind regards / Fredrik jagakatt@gmail.com
hi I have repaired one of them systems
If you need parts of the German service manual translated send me a message.
Rebuild it to mach4.
someone know how to work with tnc 135 heidenhain pls help me
All old Heidenhain controllers boots a display a message saying "power intrupeded" . Press CE key on the controller. Then press feed button a large green colour button . Then press cycle three times for each axis. If it has no problem the the X,Y & Z value will be displayed .
u keep talking fast ?
slow down a bit
if you need anything translated from german which is too hard for ze olde google translate, gimme!
Way too many discrete parts to be a relevant design today.
+Dan Frederiksen Except for the fact that it _is_ relevant - think about the number of these still deployed and working. Reworking one of these from scratch is rather non-trivial.
hi I have repaired one of them systems