Re: Yamaha YST-C10 stereo capstans run for 10 min when unit is turned on

Ok, thanks. Using Pin 9 as ground, here's what I measured:

Pin 1: -14.2
Pin 2: 14.2
Pin 3: 12.2
Pin 4: 11.4
Pin 5: 5.5
Pin 6: 5.5
Pin 7: 1.4 --> 3.85
Pin 8: 0.02
Pin 9: NA
Pin 10: 0
Pin 11: 5.3
Pin 12: 4.96
Pin 13: -1.4

The voltage on Pin 7 started as 1.4 when I first turned the unit on (and the capstans were spinning continuously) and reached about 3.85 volts after 10 minutes or so (and the...

Re: Yamaha YST-C10 stereo capstans run for 10 min when unit is turned on

I found the 13-pin plug on the power supply board that goes to the deck pwb and put one multimeter probe on the brown wire (on the far right in the photo), and the second probe on each of the other wires (#1 is on the far left in the photo).

I got these values for dc voltage:

1. 13
2. 19
3. 19
4. 14
5. 14
6. 14
7. 18
8. 19
9. 19
10. 1
11. 1
12. 1

Not sure how to interpret these values....

Re: Yamaha YST-C10 stereo capstans run for 10 min when unit is turned on

I checked the voltages coming from the power transformer. I measured 20.8 volts with red/black wires (shown in picture); 42.2 red/red; 2.7 red/blue; 5.0 red/yellow; 7.3 red/blue. I'm not sure how to check the voltages coming from the power supply. I tried touching two pins on one of the connectors on the power supply board and got zero volts with it set to 200 AC (see photo). Is this the correct way to do it? I also attached photos of the power supply board....

Re: Yamaha YST-C10 stereo capstans run for 10 min when unit is turned on

Ok, thanks. Here are some pictures. The power cord can be seen exiting the unit on the left in the second picture....

I have a Yamaha YST-C10 mini-stereo that was made around 1990. It has two cassette decks, a CD player and an AM/FM tuner. When it is turned on in tuner mode, the cassette deck capstans normally run for about one second and then the radio will begin to play. Currently, however, the capstans run continuously for about five minutes followed by running intermittently in two second bursts for another five minutes. The radio will play softly when the capstans stop during the intermittent phase. After about 10 minutes of this, the capstans stop completely and all the stereo functions work fine.
...

Re: New Members - please post your introductions here

Hello,

Happy that I learned of this forum from a friend.

Cheers,
Tom