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 21 (click to view)
Disassembly
C155
Removing and Replacing the Power Light
1. 2. Remove the speaker unit as described earlier. Gently pry up the power light from lower edge of the back housing then remove it.
Figure 13. 3. 4. To replace it, gently insert the power light into the slot, then press down until is sits firmly in the back housing. Restore the speaker unit and other parts.
Removing and Replacing the Antenna Module
1. 2. Remove the transceiver board as described earlier. Gently remove the antenna module from the transceiver board.
Figure 14. 3. 4. To replace it, gently snap the antenna module into place on the transceiver board. Restore the back housing and other parts.