I have a Kenwood CT-203 dual deck. Tapes play noticeably slow - both units, so I am guessing it is not a belt issue. I read here that it may be the logic chip...What is that, where is it and how do I get one/replace it...please..
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Yes, the belts need to be check and idlers or whatever drive mechanism that is used in that system. Dual deck units are among the most unreliable units there are and a reason I tell people for the last 30 years not to buy those things. Almost most of the time they are not worth fixing due to their poor performance at the end. These are facts not just opinion.
Is it the same tape every time or all tapes? If it is all tapes then it's more than likely a belt issue. The tape players have little rubber belts inside they sometimes get stretched when they are used alot. And they will make a whinning sound. They can be replaced.
check your cables to the units channel that doesn't work, for breaks. Does the cassette player play back a pre-recorded tape okay? if it doesn't there might be a internal fault.
Check the wires to the tape head to see if one is off.
in most cases yes: each deck probably has a flat belt that has aged and does not offer the correct tension to the capstan drive. all parts that touch the belt must be cleaned with alcohol; the capstan pressure roller probably needs cleaning also. usually have to remove some parts/screws to be able to take out/install the belt. replacement belt must be about 1/2 inch shorter in circumference than what you remove. of course power/batteries must be removed before opening case. be gentle when replacing screws and note the types and lengths as these are removed to make sure they go back in same place - low cost belts available on internet after searching ($1 - 3$)
capstan belt may be failing. check this by removing lid and touch the capstan flywheel when running. if it is easily stalled/slow to come up to speed and or the belt slipping badly then belt will require replacement.