Oki MICROLINE ML320 Maintenance Manual - page 221
of
354
Printer alarm occurs.
Internal CPU RAM error
l
Replace
P r o g r a m R O M e r r o r
l
Replace Q13.
External RAM error
The
(on pin
(on pin
(on pin
(on pin 4) of
and
and
AD O-7 and DRAM AO-7 are the same as shown in Figure
L
625 ns
1 2 5 n s 1 8 7 n s
62.5 ns
,
375 ns
5 v
ov
OE or WR
Figure 7
The signal levels of AD O-7 and DRAM AO-7 should be stable at high or low level at the
rise of
No
The RAS is the same as shown in Figure
No Replace
Yes The CAS is the same as shown in Figure
No
The output signal on pin 8 of
is the same as shown in Figure
CAS
Figure 8
No
Replace
The output signal on pin 8 is now the same as shown in
Figure
l
No Replace
1.
Yes ReplaceQ4.
Yes Replace
Yes
Replace Q8 or
(D-RAM).
1-8