Great service manual. Unfortunately on page no. 41 there are some details which i can't read.
Text excerpt from page 5 (click to view)
1. How to enter the test mode â¢ Reset the unit while holding the "FM" key and preset "6" key. â¢ All indication segments go ON at the beginning of the test mode. 2. How to release the test mode â¢ Simply reset the unit. â¢ (NOTE) The test mode is not canceled by ACC OFF, power OFF, momentary power down or the panel off. 3. Audio adjustment â¢ Set the volume level to -10dB (which is shown as "30" on the display). â¢ Loudness OFF. â¢ The BASS/TREBLE and BALANCE/FADER can be set to the full-boost/full-cut and fullfront/full-rear each by pressing the "Track UP" / "Track DOWN" keys. â¢ Sound coordination doesn't appear for the feed.