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4. TROUBLESHOOTING GUIDE
POWER LOSS INOPERTIVE
MAIN SW
MAIN SW ON
NORMAL
IC301-4 (SCAN IN 0)
PULSE INPUT
CHECK
S3062, R3021
IC302-7 (UNREG)
CHECK PW1, CA2
IC301-81
(VDD)
IC301-84
(RESET)
CHECK IC302
CHECK IC302, R3051
IC301-85
(BAT OFF)
CHECK R3052
IC301-80
OSCILLATION
CHECK X3001
IC301-82
OSCILLATION
CHECK X3002
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
NO OPERATION IF ABSENT
CHECK X1101 OSCILLATOR, L1106 AND IC111
CLK (114MHz)
OSCILLATION
CHECK IC111-9, L1106
SD CLK (57 MHz)
OSCILLATION
IC106, 107-38
SD RAM (IC106, IC107) MOVEMENT CLOCK
NO READ PROGRAM FROM IC121 IF ABSENT
CHECK IC102, IC106, IC107
IC102-140, 141
IC301-75, 76
CHECK SOLDERING OF
MEMORY PIN
INCORRECT HANDSHAKING BETWEEN 8-BIT
CPU AND RS-232C
CHECK EACH INTERFACE
PUSH SUTTER
BUTTON
IC301-2, 3
(SCAN IN 4, 5)
PULSE INPUT
CHECK R3025,
R3026, D3067, D3068
CN301-7, 8
(P ON, P(A) ON)
CHECK IC301,
R3005, R3006, PW1
IC301-6, 21, 25
HIGH
CHECK
IC301, CA1, PW1
SERIAL
COMMUNICATION
CHECK
IC301, CA1
CHECK CA1
TAKING INOPERATIVE
LOW
OFF
NO
LOW
LOW
LOW
NO
NO
ON
YES
HIGH
HIGH
HIGH
HIGH
YES
YES
NO
OK
OK
NG
NG
YES
YES
HIGH
YES
OK
NO
LOW
NO
NG
