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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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tape deck setup question
Hey all;
I've got a Technics tape deck (RS-B18) that is about 20 years old. I had some problems with intermittent channels (rec and play) and took it apart to see what I could do. I found a cold solder joint in the signal path and resoldered it, which (so far, anyway) has fixed the problem. However, there are a few things I'm wondering about. First, the levels (as indicated on the meters) are lower in playback than record. IOW, if I record a cassette with the levels reading around 0, the tape will play back with the levels at, say -3 or so. It also varies depending on how the noise reduction and bias is set: 1. No Dolby, CrO2 - levels are pretty much the same 2. Dolby B, Cr02 - levels slightly lower on playback 3. dbx, Cr02 - levels considerably (3 - 6 db) lower on playback 4. any or no noise reduction, Metal - no playback at all (this has been a problem since I got the deck) I can post more combinations if need be, but I hope that this will give the general idea. I also cannot remember if this was the way things were going before the repair (I think it was though). Are these type of discrepencies normal, or can/should I adjust things to equal them out? I also noticed that the playback was a little dull after the repair (to be honest, I hadn't used the deck in quite a while, so it may be the way it always sounded). Would this be a bias setting that I may have inadvertently moved while repairing? or perhaps it needs some adjustment in another area? Thanks |
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