Service manual

EPL-5600 /ActionLaaar 16W Send@ Manual
Opwatfng Prindp+as
2.2.1.1 Reset Circuit
The entire system (the CPU and the external devices) can be initialized if the RESET signal (CPU
pin 113) are active simultaneously. This circuit uses an
h451938 IC to monitor the supply voltage if
a voltage level less than 425 V is detected. The reset time is approximately 128 ma.
+5V
L
f
+
Vcc OUT
M51938FP
(IC27)
c
+W
L
RSTIN
RSTOUT
E05A92
(IC25)
.
L
~gure 2-38. Reset Circuit
,.
2.2.1.2 Bus Control Circuit
The MB86930 CPU outputs the R/W (read/write) signal, AS (address strobe) signal, and the B131,
BE1, BE2, and BE3 signals (byte embles) to the ASIC E05A91. The ASIC E05A91 uses these signals
to generate the RD (read strobe) signal, WR (write strobe) signal, and READY signal.
CPU
MB86930
(ICI)
Rlw—
‘1
As
BEO-3
READY
E05A91
(IC9)
Address Data ~ M
Bus Bus
Figure 2-39. Bus Control Circuit
Rev. A
2-19