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Complete manual with clear schematic diagrams and printed circuit board layouts of two variants of the headset and the transmitter an old and a new version.
Also shows how the headset and the transmitter is opened and how transmitter and receivers can be adjusted and where to measure.
I had no problems to repair the headset using this service manual.
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Excellent printing quality. A complete and very useful manual with all details.
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This is a great site. I placed my order and by the next am it was available for download. Had some problems with some missing copy on some pages. Once I brought the error to the OMC's attention, the issue was resolved. I'll come back again.
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Mi spiace per non poter scrivere in inglese... ma sono veramente soddisfatto del servizio offerto. Grazie..!!
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The quality of this manual is good. It has all schematics and setup information for both the MDS-B3 and the MDS-B4. The scan quality is quite good, all pages are readable, This service manual also contains scans of the operating instructions from the User manual.
5-2. Print is Too Dark or Too Light
START
Is reference voltage input to pin 2 of IC6 on MA-99 board when �CONTRAST� is set to center position? YES
NO
Peripheral circuits Q200 and Q16 on MA-99 board are defective.
Is reference voltage input to pin 5 of Q7 on MA-99 board when �BRIGHT� is set to center position? YES NO
Peripheral circuits Q16 and RV6 on MA-99 board are defective.
Is voltage (approx. 1.5 to 2.5 V) available at pin 6 of IC304 on MA-99 board when head is at the normal temperature? YES
Peripheral circuit IC401 and pins 29 and 30 of CN9 NO on MA-99 board, or the thermistor in the head are defective.
Are required voltages available at each terminal, 3 V at pin 19 of IC500 on MA-99 board, and 1 V at pin 23 of IC500? YES
Peripheral circuit Q21 on MA-99 board is defective. NO
The head voltage or CN9 on MA-99 board is defective. Is density of stair step printed in test mode properly? NO
YES
The data buses of IC500 and IC503 on MA-99 board are defective.
5-2
UP-895/(E)
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