Clairtone 7980 lower deck motor voltage
- Thread starter area51
- Start date
Those car stereo deck motor usually marked 13.5V-15V. You should NOT have any prolem by using a good quality 12V motor.
The lower deck's motor can take 8.4-15V. There'a a 33-ohm dropping resistor for it at R343, which, if the motor truly draws 72mA like the datasheet says, will drop it by 2.4V. That means you can't exceed 17.4V without exceeding 15V to the motor. But uh oh, the AC rectifiers on these put out 18-20V!
The reality of it is, R343 is never a 33-ohm resistor; that's only what the schematic says. What they really installed is a pair of zener diodes in series. I don't know what the zener voltage rating is and I haven't measured that spot, but I'm guessing it's very similar on batteries as it is plugged in. If those diodes fail and short out, the motor's going to get more than 15V when using a cord, which might damage it.
The reality of it is, R343 is never a 33-ohm resistor; that's only what the schematic says. What they really installed is a pair of zener diodes in series. I don't know what the zener voltage rating is and I haven't measured that spot, but I'm guessing it's very similar on batteries as it is plugged in. If those diodes fail and short out, the motor's going to get more than 15V when using a cord, which might damage it.
There is an adjustment for motor speed and if it’s not working then the motor should be replaced!!! And FYI the resistor Caution (Eric) is speaking of, tends to need replacement if never done
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Chipmonks sound can be made by a slippery pinch roller also, besides dirty record switches.
~Royce
~Royce
I have seen this before on other boxes....if there is an adjustable pot on the board linked to the motor, chances are that will need replacing, a real common issue on jumbo boxes
By the way, the original model number for the deck's motor is EG-500AD-2B. However, the EG-530AD-2B will also work
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