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.
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.
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.
Text excerpt from page 66 (click to view)
DECK MECHANISM ADJUSTMENT
5. Audio/Control (A/C) Head Adjustment
Purpose: To insure that the Tape passes accurately over the Audio and Control Tracks in exact Alignment in both the Record and Playback Modes.
5-1. Preliminary Adjustment (Height and Tilt Adjustment) Perform the Preliminary Adjustment, when there is no Audio Output Signal with the Alignment Tape. Test Equipment/ Fixture
� Blank Tape � Screw Driver(+) Type 5mm
-0.05
Test Conditions (Mechanism Condition)
� Play the blank tape
Adjustment Procedure/Diagrams
1) Initially adjust the Base Assembly A/C Head as shown Fig. C-5-1 by using the Height Adjustment Screw(B). 2) Play a Blank Tape and observe if the Tape passes accurately over the A/C Head without Tape Curling or Folding. 3) If Folding or Curling is occured then adjust the Tilt Adjustment Screw(C) while the Tape is running to resemble Fig. C-5-3. 4) Reconfirm the Tape Path after Playback about 4~5 seconds.
NOTE
Ideal A/C head height occurs, when the tape runs between 0.2~0.25mm above the bottom edge of the A/C head core.