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Just need to do some adjustments following the trimmer replacements…I don’t expect them to be far away as I measured across the relevant legs of each one and set the new trimmers accordingly but doesn’t hurt to check……used Rudi’s digital tachometer I purchased for the very purpose…..seems a shame not to use it. 33rpm up first and it was a little off…
And had a dig around in my box of miscellaneous odds and ends and located some machine screws to fix the PCB in place.
Got around to replacing the skeleton trimmers today, not that they where suspect in anyway just because they probably will fail at some point.
Ok….time for a update, according to solderons training notes when FF is operated the collector of 1TR25 should go high (approx 22v) I was getting closer to 14v at this point….still good.
Also said voltage is fed to the Base of 1TR27…still good…and therafter to the Base of 1TR28 thus causing the motor to rotate in the forward direction…..the 14v was not getting out of 1TR28…..so no rotation.
Unclamped the sock and rotated it to remove the kinks…..this is much happier now, never seen this before……will re secure the clamp and look to replace the trimmers.
during testing I found that when the tone arm approached the ES position it was slowing down considerably, when moving forward slowly by nudging the tone arm by small increments to simulate a record on the deck, and more often than not actually stopping short.
I noticed that the drive motor was still running and the belt was slipping….watching this a couple of times i spotted this..the cable containment sock was all twisted and lumpy and the carriage was fouling on it at the end of its travel…
Tht
spent a little time this morning unsoldering and cleaning the transport slide switches, didnt look bad actually….I think someone may have gold plated these ;¬) but cleaned them to eliminate them from any further considerations.
Its doubtful I would have missed the absence of said screws so im suspecting a third party involvement somewhere…..Ok…..opened up and a visual inspection prior to power on reveals only one screw holding the main PCB in place….not a very encouraging start.
Hit Start and the neon lamp came on, always a good start….the 45rpm lamp also lit up and the main motor started to revolve….scale lamps also illuminated…all good stuff, however the solenoid energised straight away and the tracking motor sat motionless….a small push inboard did nothing….a small push outboard momentarily powered the tracking motor, the carriage didnt move as the belt to the pully was just slipping too much to get any traction.
So……quite a bit to sort out, I suppose the main good thing is that all the vital components, transformer/motors/solenoid and I did notice the detector arm lamp was lit/ are all healthy…they just seem to have “lost there marbles”.
I will start by examining the slider switches as they often seem to be behind a lot of issues with these decks…..as always comments and advice is welcome ;¬)
Put the PCB back and got the variac out…….with the meter in series slowly powered up, the multivibrator circuit clicked on and there was no smoke or crackle of unhappy components..current draw was around 20ma…
Quick look under shows signs of activity….looks like 1TR29 and 1TR30 have been replaced with something else…also the speed control relay has been replaced….
Well secured and packed…..platter was packed separately and stowed away under the Beogram in foam and cardboard
