I purchased a copy of my old JVC VCR Service manual from Owner-Manuals.com
The copy was complete and valuable to me.
I was able to fix my VCR - it had a bad belt.
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Good quality, the manual help me to repair the echo/reverb section
Text excerpt from page 9 (click to view)
ADJUSTMENT
<TAPE PLAYER SECTION> 1. Tape Speed (4.8cm/sec) Adjustment Settings : � Test tape : TTA - 100 (TAPE CENTER) � Test point : PHONES JACK (J101) � Adjustment location : SFR 401 � Super bass : OFF � Volume : MAX Method : Play back the test tape and adjust SFR 401 so that the frequency is 3010 Hz ± 10 Hz (FWD) and FWD SPEED ± 50 Hz (REV). Then confirm WOW is less than 0.52%.