JVC TT-101 Won't Stop


The Stop button on my recently purchased QL-10 doesn't work. It worked at first after the TT warmed up, but then quit completely. I since have replaced all 37 electrolytic caps on 3 boards, but it made no difference. The power voltages are correct. The button itself is fine and shorts pins 6 and 9 of the P8 connector on the main board, but the motor doesn't stop. What could be wrong? Any particular transistor or adjustment? Please help! -Alex
safesphere
@jpjones3318


Of course ... the TT-101 is 40 years old but other turntables that have the same years as the TT-101 have few or no problems even in the joints of the welds; maybe the PCBs of other turntables are not igorscopiche? I am thinking, for example, of the usual Technics SP 10 and others of the past.

The TT-101 from what I have seen has a motherboard with tracks only at the bottom and some tracks on the upper side; There are several individual cables that pass through the pcb from one point to another in the upper side.

I consider very little reliable multi-wire connectors that move not having a clip that keeps them still, the same I think for the cables become too rigid with the passage of time.I am inclined to replace the multi-connectors with Molex or other types of mini-connectors and, only where it is possible to replace all the cables .... then we will switch to the damns solderings
Only cable issues I've seen have been due to people soldering the wire wraps, which causes a stress point and leads to very easy breakage. 

The board headers are delicate to, as pressure on the pins will delaminate the traces.  Have to be very careful with those.  I pull them to apply hot glue underneath to reinforce them.  Doesn't help much, but I helps. 
I can refurb 2.5 SP-10MK3 in the time it takes me to do a single TT-101 right.


I have no doubt .... the pcb of the TT-101 is a real curse for the time spent looking for faults.
I think we all agree that the TT101 is fussy. That’s one way in which this hobby requires a relaxed approach. For my part, I can only thank JP for the excellent work he did on my unit.

Once JP educated me on the genesis of the issue with my TT101, I put a little space heater in my basement man cave, I set it to heat the room just enough to keep the temperature above 65 and control the humidity somewhat. I want say that I have had no problem since doing that, but wouldn't I be asking for trouble?
@lewm 

Does this mean that the TT-101 if it is not placed in a heated and dehumidified environment makes the whims like children? Wowww