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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.
SECTION 2 TEST MODE
FL DISPLAY/KEY LED TEST MODE
Press the REPEAT, ENTER/NEXT and SURROUND buttons simultaneously. 1. All FL segments and all LEDs turn on. 2. To access the microprocessor information, press the P FILE key. Each pressing of the P FILE key advances the display on the FL tube in the following sequence. STR microprocessor version number HCD microprocessor version number VCD microprocessor version number (VCD model only)
SEC BOARD
SECTION 3 DIAGRAMS
3-1. CIRCUIT BOARDS LOCATION
AGING MODE
1. CD aging mode To execute the CD aging, set the three discs to the CD tray and set the function to CD. REPEAT, ENTER/NEXT and LOOP buttons simultaneously. The CD aging mode starts and the disc calendar starts blinking. Tape aging mode To execute the tape aging, set the two tapes to the tape A and B drives. Set the function to TAPE. Press the REPEAT, ENTER/ NEXT and LOOP buttons simultaneously. Press the A forward key to start the tape aging mode. "AGING" appears on the display.
2.
PRI BOARD ENCAPSULATED COMPONENT
Model name Destination 3. To check the encoder, press the MUSIC key. The following display appears on the FL tube. "K 0 J 0 V 0" The number after K indicates the number of times that the key is pressed. The key which was pressed in the past, is not counted. The key which is pressed hereafter is counted. Pressing any key increases the number after K. The number after J indicates the number of rotations that the JOG dial is rotated. Turning the JOG dial clockwise increases the number after J. Turning the JOG dial counter-clockwise decreases the number after J. The number after V indicates the number of rotations that the VOLUME dial is rotated. Turning the VOLUME dial clockwise increases the number after V. Turning the VOLUME dial counterclockwise decreases the number after V. To exit this mode, perform the "Cold Reset" (reset clearing memory) as described below.
CD SERVICE MODE
Turn on the main power. Press the REPEAT, ENTER/NEXT and KARAOKE PON/MPX buttons simultaneously. VACS toggles between ON and OFF.
PANEL BOARD
VACS LEVEL DISPLAY
Turn on the main power. Press the EDIT, ENTER/NEXT and KARAOKE PON/MPX buttons simultaneously. VACS level appears on the display.
AMP-A BOARD
CD SHIP MODE
Turn on the main power. Press the PLAY MODE and POWER buttons simultaneously. The main power is turned off and LOCK appears on the display.
SUR BOARD
TUNER STEP CHANGE
Turn on the main power. Set the function to TUNER. Select MW band from the present tuning. Turn off the main power. Press the ENTER/NEXT and POWER buttons simultaneously. The main power is turned on and the changed step appears on the display.
KEY-CON BOARD JOG BOARD SUPPLY POWER BOARD MAIN BOARD AVIN BOARD SURROUND AMP BOARD
GENERAL TEST MODE (INCLUDING AMPLIFIER AND TUNER)
Press the REPEAT, ENTER/NEXT and CLOCK TIMER SET buttons simultaneously while the main power is on. 1. Sound volume display segment starts blinking. 2. The tuning enters the PRESET mode. 3. Rotating the VOLUME control clockwise increases the volume level to maximum. Rotating the VOLUME control counter-clockwise decreases the volume level to minimum. 4. Pressing the MUSIC key decreases the equalizer curve to minimum and "EQ CHECK" appears on the display. Pressing the MOVIE key increases the equalizer curve to maximum. Pressing the GAME key makes the equalizer curve flat. 5. Pressing any of the DBFB, GROOVE or SURROUND key disappears "EQ CHECK" on the display. To exit this mode, perform the "Cold Reset" (reset clearing memory) as described below.
MD/VIDEO 1 FUNCTION CHANGE
Press the FUNCTION and POWER buttons simultaneously while the main power is off. When the function is set to VIDEO 1, the function is changed to MD and MD appears on the display. When the function is set to MD, the function is changed to VIDEO 1 and VIDEO 1 appears on the display.
VOLUME BOARD
MIC ECHO BOARD
COLD RESET (Reset which clears memory.)
Press the REPEAT, ENTER/NEXT and DISPLAY buttons simultaneously at any time. The system is reset while clearing memory.
HOT RESET (Reset which does not clear memory.)
Press the REPEAT, ENTER/NEXT and TIMER SELECT buttons simultaneously at any time. The system is reset without clearing memory.
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