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Believe me everything I am about to write is totally true. My trusty 4000 was playing happily one evening and then stopped mid record. Arm returned manually, re started and played all the way normally for a while and did the same. I traced this issue to a faulty reed relay so repaired that, all well. Then after a while I pressed play and nothing, nada. Traced that to the 6V line at the fuse broken away from the board, re soldered that, put a record on, played until record end no problem, then after a few days arm lifted but no return. Just sat there with platter running. Started fault finding and general cleaning of all contacts on start/stop board and arm slider. Put all back together runs /plays until record end and lifts without returning. Now the fun starts… Tried the deck the next day to start fault finding and it starts immediately, drops at record start but at 45 RPM. I press return, arm lifts but wont return. Manually wind the arm back and try again without record, arm moves in, stops and drops at correct place but at 45 RPM. Do it again, this time it runs at 33 RPM, still won’t return after stop and return is selected. Next day WITHOUT touching a thing, try the deck it starts, arm moves 1/4 inch toward the record, before the switch under the slider is actuated, and drops to play, at 33 or 45 RPM depending on how it feels. Try again today, WITHOUT altering a thing and it now moves into the record and stops without dropping at all by half the distance than before. It will manually go FWD when selected until runout without record and not return manually or automatically. How on this gods earth can it get progressivly WORSE without me actually changing ANYTHING except cleaning all the selector switches, which I did at start and never touched or altered anything since. I blame brexit. On a more serious note these are the most elegant if most frustrating peices of equipment I have ever owned. Luckily my 4002 is still going strong with no issues, but given the history of my 4000 I daren’t even LOOK at the damn thing.
With all due respect I found the above very funny….it’s typical behaviour for one of these decks! they can be so frustrating…I have spent many hours going over and over a fault finding exercise and getting nowhere, and as you say things can seem to get worse despite your best efforts….your issue sounds like more than one problem, possibly both being intermittent which are the worst kind.
My advice, for what its worth, would be to confirm the p0wer supply levels for 6 and 24 volts at the voltage regulators….unstable supplies can wreak havoc on the logic board, a failing/leaking smoothing capacitor will cause this as will a failing voltage regulator transistor, I have suffered all of these failings. The logic board itself and the associated IC chips are very reliable and seldom fail, my experience has been most issues can be traced to power supplies dropping below the specified threshold and faults associated with the switches and the small plastic spigots that can stick and hold the leaf switch in the wrong position…and also there is the real possibility of a bad connection between the wiring loom and the control panel….I have had one case which was resolved by resoldering all the connections from the wiring loom to the control panel connection terminals….I have no idea which connection was poor or dry but on completion everything came good…..
Stick with it…..send pics and updates as there are lots of very capable members in here who will advise/help you ;¬)
Regards Craig
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