Canon A-200 series Service Manual page 138

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FOO or FOC failure
* Check the cable from the power supply.
* Check the cable from the main PCB.
* Check the timing clock generator circuit.
16MHz
8MHz
L
J
2MHz
L
Figure 8-3
* Check the VFO circuit.
Approx. 4Jl
.\
WINDOW
~
______
rl------~------~
READ DATA _ _ _ _ _
nL-___----InL-____---InL-_______nL-____---Ifl
Figure 8-4
* Che.ck the signals shown below.
INDEX .......................... Pin 17 of FDC
SIDE ............................. Pin 27 of FDC
TRKO ............................ Pin 33 of FDC
WG ............................... Pin 25 of FDC
DRIVE 0 .... : .................. Pin 8 of U132
DIR ............................... Pin 38 of FDC
DRIVE 1 ....................... Pin 6 of U132
STEP ............................ Pin 37 of FDC
@ PIT or PIC failure
An unexpected interrupt has been received during the interrupt mask register of PIC is
reset, or the timer 0 clock is too early or too late.
* Check IRQO-7 and INT signals.
*
Check PCLK, CLKO, CLK1 and CLK2 signals.
419n5
M
PClK
1' _
838n5
ClK2
ClK1
ClKO
Figure 8-5
135

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