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This is a good quality scan of the service manual which includes an assembly diagram, block diagram, schematic, and parts list. Exactly what is needed to repair my KR-V55R receiver.
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IC DESCRIPTION IC, MC68HC05P6SCD2776
Pin No. 1 2 3 4 Pin Name SYSTEM RESET WAKE UP SYSTEM AGC CONT INPUT SEL 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 AUD MUTE TIME SEL
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ELECTRICAL ADJUSTMENT
I/O I I � I Initializes the system. Low input.
Description
Detects the key input and starts up the system. Low input. System selector (setting each model). High: 8RC-9. AGC control. High: OFF. Low: ON. High: TAPE. Low: MIC. Audio mute. Setting the recording time in the L/L mode. High: ON. Low: OFF. High: 10 sec. Low: 45 sec.
I/O I/O I O I/O I/O O I I/O � � I I I I I/O I I I � I I/O I/O I
RADIO/MIC DO DI SK CS ISD MOSI ISD MISO SCLK VSS VREF BAT IN PB/REC KEY STOP/REW KEY FF KEY ISD SS LED PB LED REC ISD RAC TCMP ISD INT OSC2 OSD1 VDD
System setting by selecting signal. High: RADIO (PAUSE). Low: MIC (OFF). Data input from EEPROM. Data output to EEPROM. System clock to EEPROM. System selector to EEPROM. Data output to ISD. Data input from ISD. System clock of ISD. GND. 0 V. Reference voltage to A/D converter. 3.3 V TYP. Battery voltage input. (for voltage identification). 8RC-9: BAT IN. PB/REC KEY input. 2/3 VCC PB. 1/2 VCC REC. STOP/REW KEY input. 2/3 VCC STOP. 1/2 VCC REW. FF KEY input. Low: FF. ISD system selector. PB LED. REC LED. ISD RAC input. Not used. ISD INT input. 2.0 MHz ceramic filter. 2.0 MHz ceramic filter. Power supply input.
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