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Everything okay, thanks a lot. It was a pleasure for me to make a deal with you.
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A deal without problems, very fast and the manual is a good quality. Sorry for the my english.
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Superb service and excellent quality of the document received
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no problems with the purchase of a circuit diagram
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Scan are good quality and overall just what i was looking for. 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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