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There are currently no product reviews.
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very helpfull
circuit diagram and sparepart list available
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Very good reproduction (copy) of original manual. Didn't have a parts list, but schematic was completely labeled with parts. Complete instructions on how to adjust mechanical functions of the 8-track deck. Well worth having and at a very reasonable cost.
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It's a full manual. All the parts are in there. I haven't found the problem yett, but I am working on it; hope I can rebuild the part myself. To make it more secure and unbreakable this time. Because the part has failed several times before and costs a lot to let it be repaired.
Thanks so much for this rich illustrated and parted manual.
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I downloaded the document. The manual was complete, well scanned and everything was legible. I could zoom in see what I needed to know. There's not much more that you can ask.
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It was complete service manual with all needed service informations. Thanks.
5-2. PRINT IS TOO DARK OR TOO LIGHT
START
Is voltage (approx. 5.7 V) at pin 4 of IC6 on MA-91 board output when "CONTRAST"is set as center value?
NO
IC203 and IC201 or peripheral circuit of Q16 on MA-91 board are defective.
YES
Is voltage (approx. 1.4 V) at pin 6 of IC6 on MA-91 board output when "BRIGHT" is set as center value?
NO
Peripheral circuits IC203 and IC201 or Q15 and Q17 on MA-91 board are defective.
YES
Is voltage (approx. 1.5 to 2.5 V) available atpin 78 of IC505 on MA-91 board when head is at the normal temperature? YES
NO
Peripheral circuit IC404 and pins 15 and 16 of CN202 line on MA-91 board, or the thermistor in the head are defective.
Are the required voltages available at each terminal, 3 V at 19 pin of IC6 and IC7 on MA-91 board, and 1 V at 23 pin of the IC's? YES
NO
Peripheral circuit Q21 on MA-91 board is defective.
Is density of stair step printed in test mode properly?
NO
The head voltage or connecetor CN202 line on MA-91 board is defective.
YES
The data buses of IC7 and IC8, data buses of IC602 and IC603, or peripheral circuit IC2 on MA-91 board are defective.
5-2
UP-980(UC) UP-980CE(CE)
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