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Late to the party - I did use an RC88 with my TSR8 - some of the buttons are different, but I don't remember which ones. Basically, you have to remember which button does what... More frustrating than worthwhile.

R103-R106 are Trimmer 4.7KB. Anyone know if those are log or linear taper?

TP3 and TP4 are 4.8v with tension arms at rest, 2.something when they are lifted, so there's nothing wrong with then tension arm detector things. I looked more closely at the tension trimmers, and it appears that R104 might be damaged as well as R106 (which is damaged, although apparently...

with no reels at all, left spool spins backward, right spool continues its misbehavior.

I wonder... The right tensioner has two opto-detectors. The one on the bottom is on-off, and the one on top is graduated (the bit of plastic or metal which blocks the beam is shaped such that it blocks more of the beam as the arm gets progressively higher). We've been presuming the tension...

If anyone is still interested, the video is here: YouTube

I think I'm going to go back to the 1st machine and try to get it running for now. I'll leave this for another day. Thank you both for your help, I appreciate it very much!

Hmm, I thought I hit reply. So I re-visited the circuit board. R106 looks like it got damaged - the black plastic top which should be attached to the rotor is missing, and possibly the whole thing is not functioning. What does R106 do?

It appears R106 is damaged. The black cap which presumably is connected to the rotor, and allows a screwdriver to turn it, is missing/broken/something. I have no idea if the resistor is functioning, but it is a good bet it is doing something wrong. What does 106 control?

sry - yeah, still messed up, and it stops as soon as the tension arm goes slack. is the back-tension one of those things that is very fussy to adjust? re posting video... hmmm, let me figure something out. I don't have an account for youtube, but I do have a facebook account.

Nothing seems amiss with the control board. Still being weird - what is very strange is that the takeup actually does spin for a second, then slows to a stop. I wonder if there's a bad capacitor somewhere. <sigh>.

Update: Edit and dump work as they should. If you let the right tenion arm down, it stops the machine (and the capstan stops). The brake solenoid and bands are doing what they should. The lifters are working properly. (I'm doing all this with the front panel off). ... ongoing...

Not that I recall - I've been pretty careful handling this thing. EDIT mode works fine, but that's not much help. :-(

I got a TSR-8 from ebay (my second one), and the capstan belt was slippy. So I ordered a new one, and just now replaced it, and that seems to be going well. However, the takeup is acting weird. FF and REW are fine, capstan/pinch is fine, but when I go into play mode, the takeup reel starts to...