Re: Kenwood KX-56CW Duel Cassette Deck Repair
Thanks for your reply! I'll probably have to shelve this for now, but I really appreciate your help and patience with walking me through this process....
dustfilledhobo
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Last Activity: 04-27-2021, 09:38 PM
Joined: 04-11-2021
Location: PROVO
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Re: Kenwood KX-56CW Duel Cassette Deck Repair
Thanks, that explains it.
Any ideas on why shorting R125 gave me the desired results?
Anywhere else I can look for what might be causing the issues with the motor spinning too fast?...Leave a comment:
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Re: Kenwood KX-56CW Duel Cassette Deck Repair
So, I replaced Q32 with an exact replacement (2SA933S) and nothing changed.
Since R125 was acting funny I shorted it out and now I can tune the motor to the correct speed, but the sound has a warble to it. Is this because of the shorting or should I investigate the belts? Is it dangerous to short out this resistor?
Without the short the motor spins so fast that it's hard to tell if there's a warble. Also, the cassettes play fine (correct speed and no warble in cassette deck A, so I know the issue isn't the...Leave a comment:
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Re: Kenwood KX-56CW Duel Cassette Deck Repair
When I measure the resistance of R124, VR3, and VR4 with the power on and the motor running, it measures correctly, but when I measure R125 it measures as "overload" which I'm assuming is an open circuit. This fell in line with what you thought could be the problem, so I removed R125 from the circuit. Since R125 was measuring as open I turned the circuit on again and expected it to run as it was before, but the motor was running even faster than before. So I measured R125 while it was out of the circuit and...Leave a comment:
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Re: Kenwood KX-56CW Duel Cassette Deck Repair
Thank you! I used a continuity tester to test the switch and the switch itself seems to be working properly. I'll follow the circuit from the switch and see if I can find anything that looks off....Leave a comment:
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Re: Kenwood KX-56CW Duel Cassette Deck Repair
Thank you for your help! You're right, I mixed up the B & C on all of my measurements! Also, I just realized that Q32 is a different type of transistor. Here are the correct voltages/parts list:
Q31 (2SC1740S) B=70mV, C=20mV, E=0V
Q32 (2SA933S) B=8V, C=9V, E=11V
Q33 (2SC1740S) B=0V, C=14V, E=0V
Q34 (2SD863) B=14V, C=14V, E=14V
I shorted E-C on Q31, but it didn't slow the motor down. Does this mean the transistor is bad?
I shorter E-C on Q32...Leave a comment:
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Re: Kenwood KX-56CW Duel Cassette Deck Repair
Unfortunately the motors don't have speed adjusters on the back.
Thank you for the help though!...Leave a comment:
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Kenwood KX-56CW Duel Cassette Deck Repair
Hello!
I'm trying to fix my Kenwood KX-56CW dual cassette deck (seen in the picture below).
Everything functions as it should except that the motor for tape deck B plays back extremely fast (tape deck A functions properly). I've located the two trim pots on the board that control the speed of deck B and they were only able to bring the speed down a little bit. I was able to find a schematic online (attached) with suggested voltages, so I measured the board while playing a tape in deck B (as per the instructions on the schematic). Some voltages were... -
Re: New Members - please post your introductions here
Hello!
I'm a hobby electronics enthusiast. I primarily like to take old computers and old electronic equipment and modify it into musical instruments. I found this forum because it came highly recommended by a number of reddit users for help with electronics.
Thanks!
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