5. TROUBLESHOOTING GUIDEPOWER LOSS INOPERTIVEOFF

MAIN SW

 

MAIN SW ON

NORMAL

ON

 

 

 

IC301-4 (SCAN IN 0)

NO

CHECK

 

PULSE INPUT

 

S3062, R3021

 

YES

 

 

 

IC302-7 (UNREG)

LOW

CHECK PW1, CA2

 

 

 

HIGH

 

 

 

IC301-81

LOW

CHECK IC302

 

 

 

(VDD)

 

 

 

 

 

HIGH

 

 

 

IC301-84

LOW

CHECK IC302, R3051

 

 

 

(RESET)

 

 

 

 

 

HIGH

 

 

 

IC301-85

LOW

CHECK R3052

 

(BAT OFF)

 

 

 

 

 

HIGH

 

 

 

IC301-80

NO

CHECK X3001

 

 

 

OSCILLATION

 

 

 

 

 

YES

IC301-82 NO

TAKING INOPERATIVE

PUSH SUTTER

BUTTON

IC301-2, 3

NO

CHECK R3025,

(SCAN IN 4, 5)

 

 

R3026, D3067, D3068

PULSE INPUT

 

 

 

YES

 

 

CN301-7, 8

LOW

CHECK IC301,

 

(P ON, P(A) ON)

 

R3005, R3006, PW1

HIGH

 

 

IC301-6, 21, 25

NO

CHECK

HIGH

 

IC301, CA1, PW1

YES

 

 

SERIAL

NG

CHECK

COMMUNICATION

 

IC301, CA1

OK

 

 

CHECK CA1

 

 

OSCILLATION

YES

CHECK IC301

CHECK X3002

NO PICTURE

CLK (114MHz)

NO

MAIN CLOCK FOR SYSTEM OPERATION

OSCILLATION

 

NO OPERATION IF ABSENT

CHECK IC111-9, L1106

 

CHECK X1101 OSCILLATOR, L1106 AND IC111

YES

 

 

SD CLK (57 MHz)

NG

SD RAM (IC106, IC107) MOVEMENT CLOCK

OSCILLATION

 

NO READ PROGRAM FROM IC121 IF ABSENT

IC106, 107-38

 

CHECK IC102, IC106, IC107

OK

 

 

IC102-140, 141

NG

INCORRECT HANDSHAKING BETWEEN 8-BIT

CPU AND RS-232C

 

 

IC301-75, 76

OK

CHECK EACH INTERFACE

CHECK SOLDERING OF

MEMORY PIN

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