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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.
PCB MAIN
TEST MODE Wave ROM check MAIN: IC12, IC18
Procedure
1. Press and hold the two E keys shown below, and then turn on the power switch. 2. Select the POP GROUND sound. 3. Reduce the MAIN VOLUME level low enough.
When set to the self-diagnostic mode, the Wave ROM outputs a sine wa The Wave ROMs correspond to the keyboard keys as shown in the diagram to the right. When a key is pressed, the corresponding sine wa sound is produced. If no sound is produced, or if the sound is distorted the Wave ROM corresponding to that key is defective. This method allo to diagnose also the output routes (L/R) from the Wave ROM. -The key number indicates the Wave ROM number.
(I-1: IC12, I-2: IC18)
CPL CPR
Control Panel buttons Press and hold the two F keys shown below, and then turn on the powe LED lighting check switch.
Control Panel LED display check
Press the buttons on the control and confirm that the corresponding LE light. Press and hold the two G keys shown below, and then turn on the powe switch.
MKB
Keyboard ROM (IC1) check
The numbers are displayed automatically and repeatedly on the display Press and hold the two A keys shown below, and then turn on the powe switch.
If the keyboard ROM (IC1) is OK, only the TOUCH SENSITIVITY LIGHT L flashes. If it is defective, the LEDs (LIGHT and NORMAL, or LIGHT, NORMAL and HEAVY) flash.
9. PRECAUTIONS BEFORE SERVICING
9.1. Precautions for measuring of the output waveforms 1. The waveform was measured with a �National Digital Storage
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