I purchased a copy of my old JVC VCR Service manual from Owner-Manuals.com
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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 3 (click to view)
2-2. SCHEMATIC DIAGRAM
L-CH OUT AGC AUTO AGC T/C (R) F0 ADJ (L)
13 LEVEL DET.
PRE EMPHASIS Lout = L + K â¢ (LâR)
Note: â¢ All capacitors are in ÂµF unless otherwise noted. pF: ÂµÂµF 50 WV or less are not indicated except for electrolytics and tantalums. â¢ All resistors are in â¦ and 1/4 W or less unless otherwise specified. â¢ % : indicates tolerance. â¢ H : adjustment for repair.
Rout = R â K â¢ (LâR)
â¢ Power voltage is dc 9 V and fed with regulated dc power supply from external power voltage jack (J4). â¢ Voltages are dc with respect to ground under no-signal conditions. â¢ Voltages are taken with a VOM (Input impedance 10 Mâ¦). Voltage variations may be noted due to normal production tolerances. â¢ Signal path. F : AUDIO J : RF