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It paid to find this Service Manual, couldn't find it anywhere else. Exactly what I wanted. Received within 24 hours.
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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..!!
4-8 Trouble Shooting Chart Microphone not working
No voice from Microphone
GO YES
Check point: the Q503 on power board Observe: check the collector terminal voltage is over+0v7
Solution: replace the transistor
NO
Check point: Q503 on power board Observe: check the collector
YES Solution: Replace Q503
terminal is short circuit to ground
NO NO
Solution: check the +5V supply Circuit replaces any defected components
Check the +5V is presented
YES
Check point: Microphone input Observe: check if the any signal presenting at pin7 of CON601 by
YES
Solution: replace U601 on echo board if no signal output from pin 15
NO NO
Check point: VA+ and VA- on microphone board Observe: heck if the supply
Solution: check the connector between echo board and microphone
voltage is +/-10V
YES
Solution: replace the U401 on microphone board
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