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Yamaha K-320 repair advice needed

B

brucecoates

New Member
Hi All

I wonder if anyone can help and I apologise if I have put this request in the wrong place (please redirect me if so). I picked up one of the above for next to nothing at a boot sale. As predicted the belts had turned to goo, so I cleaned it up and purchased a new set. I installed the main belt and the smaller one to the manual tape counter. The latter does not turn freely and seems too stiff to be driven by the motor, but there doesn't seem to be any way to get it to turn more freely.
When I tried the machine after fitting belts, everything engaged as should but whatever function I use - play, ff, rewind, the machine runs for 1 -2 seconds and auto stops.... I get sound, everything. Thinking it may be the counter (being stiff) I disconnected this belt and the wires that run from this and tried the machine again - I'm not bothered about the counter, don't need it, but I got the same problem - just runs for a couple seconds and then auto-stops.
My questions. There are wires and what looks like a sensor at the back of the counter, is this causing my issue - i.e. is it detecting something out of sync and stopping the unit. If so can it be fixed or bypassed? Picture of counter included

The unit cleaned up really well and I am keen to use it, everything else looks good on it but I'm a bit out of my depth if it is a sensor that requires calibrating etc..

Any help gratefully appreciated
 

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It could be that the counter must turn so the system knows the tape is moving otherwise the tape transport shuts down. You may need to do further investigation to find out why the counter is not turning properly, correct that problem and then install the belt that drives it.
 
Hi brucecoats,

another possibility is the wires are for sensing 0000 on the counter. There may be a "to zero" switch on the front panel.

Maybe not applicable here but the counter on a RT707 has a zero sense which reverses the tape direction from Rev to Forward. This gives the option of continuous playback.

GPS16
 
dhnash said:
It could be that the counter must turn so the system knows the tape is moving otherwise the tape transport shuts down. You may need to do further investigation to find out why the counter is not turning properly, correct that problem and then install the belt that drives it.
Click to expand...
 
Well do you know what, I freed up the counter wheel ( and glued the mechanism back on!! after it had snapped off) and it works like a dream. Cleaned the heads and it sounds great. I think its been left unworking for years so with a bit of wd40 and a clean it scrubbed up well. Thanks for your invaluable input dhnash and GPS16. I'm over the moon.
 
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