− 19 −
4. TROUBLESHOOTING GUIDE
POWER LOSS INOPERTIVE
BARRIER SW
BARRIER SW ON
NORMAL
IC301-34 (SCAN IN 0)
PULSE INPUT
CHECK POWER SW,
CN303, R3020, D3014
IC302-7 (UNREG)
CHECK ST1, CA2
IC301-25
(VDD)
IC301-21
(RESET)
CHECK IC302
CHECK IC302, R3051
IC301-20
(BAT OFF)
CHECK R3052
IC301-23
OSCILLATION
CHECK X3001,
R3008, C3003, C3004
IC301-26
OSCILLATION
CHECK X3002,
R3004, C3001, C3002
CHECK IC301
NO PICTURE
MAIN CLOCK FOR SYSTEM OPERATION
NO OPERATION IF ABSENT
CHECK X1001 OSCILLATOR AND IC111
CLK (60MHz)
INPUT TO
IC102-18 (CLK IN)
CLK (30 MHz)
INPUT TO
IC101-154 (XTAL 1)
BASIC CPU BLOCK
CHECK ASIC PIN 22
IC102-113 (ZAS)
ALWAYS APPEARS WHEN CPU, ETC. IS ACCESSED
CHECK IF CPU IS READKING PROGRAM, AND
CHECK ADDRESS AND DATA BUS OF IC121
IC101-68
(ZBREQ)
REQUEST FOR USE OF DATA BUS FROM
ASIC TO CPU NO DMA TRANSMISSION IF ABSENT
CHECK IC102-110
IC102-111
(ZBGRNT)
RECEIVES ZBREQ SIGNAL AND GIVES PERMISSION
TO ASIC FOR USE OF DATA BUS
NO DMA TRANSMISSION IF ABSENT / CHECK IC101-70
IC101-141, 142
(IRL1, 2)
CHECK SOLDERING OF
EACH CPU, ASIC AND
MEMORY PIN
INCORRECT HANDSHAKING BETWEEN 4-BIT
CPU AND RS-232C
CHECK EACH INTERFACE
FOCUS INOPERATIVE
PUSH SUTTER
BUTTON
IC301-36, 37
(SCAN IN 2, 3)
PULSE INPUT
CHECK S3029,
R3022, R3023,
D3015, D3016
CN305-8, 11
(P ON, P(A) ON)
CHECK IC301,
Q3005, Q3006, ST1
IC301-6, 7, 8
HIGH
CHECK
IC301, CA2, ST1
SERIAL
COMMUNICATION
CHECK IC301,
R3015, R3032,
Q3003, CA2
CHECK CA2
AFTER LENS ADJ.
THE LENS IS IN
FOCUS
NORMAL
CHECK IC911
CHECK IC102-107
(PPCS)
CHECK CN903
CHECK IC908,
Q9072, Q9073
CHECK LENS
TAKING INOPERATIVE
LOW
CLOSED
NO
LOW
LOW
LOW
NO
NO
OPEN
YES
HIGH
HIGH
HIGH
HIGH
YES
YES
NO
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
YES
YES
HIGH
YES
OK
NG
OK
OK
NO
LOW
NO
NG
NG
NG
OK
