Canon A-200 series Service Manual page 145

*
Check the PIT
PClK
I_
838n5
ClK2
ClK1
ClKO
Figure 8-16
* Check the system RAM.
T2
T3/TW
T4 ...--_-,
....--...,
CPU-ClK
.-J
(lC51-19P)
'­
MRD
(IC107-3P)
D-OUT
---------------------~{~---------------~)
______ ~ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ L_ _ _ _ _ _ _ _ ~ _ _ _ _ _ _ _ __ _ PARITY (U107 2Pin)
PC7
Figure 8-17
* Check the DMAC.
CPU-ClK
DMA-ClK
HRQ
~
HOLDA
AEN (8288)
RDYI (8284)
Figure 8-18
142