OK?..manual is complet and helpfull... for repairing such a old and rare boombox like JVC PCM it is necessary...
Text excerpt from page 282 (click to view)
SLV-LX55/LX66S/LX77S
5. Alignment and Adjustment
5-1 Reference
1) X-Point (Tracking center) adjustment and �Head switching adjustment� can be adjusted with remote control. 2) When replacing the Micom (IC601) and NVRAM (IC603 ; EEPROM) be sure to adjust the �Head switching adjustment�. 3) When replacing the cylinder ass�y, be sure to adjust the �X-Point� and �Head switching adjustment�. 4) How to adjustment. - Monmently short-circuit the test point on Main PCB with pincers to set the adjustment mode. - If the corresponding adjustment button is pressed, the adjustment is performed automatically. - If the adjustment is completed, be sure to turn the power off.
5-1-1 Location of adjustment button of remote control