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.
Text excerpt from page 8 (click to view)
2. Insert a MD (either record/playback or playback only type) 3. After TOC reading, press [MD / ] button.
4. Press [STOP ] button. If an error is found, a self-diagnostic key appears on the display. If several errors are found, the display shows these keys when [STOP ] button is pressed repeatedly. (Ex.: MD F15 - MD F26 F22). If no error is found, only the message, "TEST" appears on the display.