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An excellent service manual contains dismantling locations of components, electronic adjustments,worth the money.
Text excerpt from page 16 (click to view)
Pin No. 73 74 75 76 77
Pin Name VDD5V VSS CONT6 CONT7 V/*P
I/O â â I/O I/O O
Description Microprocessor interface power supply. (2000pF or more path controller to be inserted at a point nearer to the pin between this pin and GND) Digital ground pin. Must be connected to 0V. General-purpose input/output pin 6. General-pirpose input/output pin 7. Rough servo/phase control automatic switching monitor output pin. âHâ for rough servo and âLâ for phase servo. Synchronization signal detection output pin. Outputs a high level when the
synchronization signal detected from the EFM signal and the internally generated synchronization signal agree.
Defect pin. Which becomes an input pin after reset and can be controlled externally. This becomes the defect monitor pin under control by command. EFM signal output pin.