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2.3.2
Reset Circuit
This section describes the hardware reset circuit. When the hardware reset signal is input, all
in
the control circuit are reset, and the CPU executes the program from the starting address. Figure
2-20 shows the reset
block diagram.
The printer is equipped with two reset
is used for resetting the + 5
line and
is used for resetting the +35
line. These reset
are described below.
+5
reset
Reset
monitors the +5
line on the
MAIN board assembly. If it drops to 42
the reset outputs a LOW signal to the CPU, gate array, and optional interface board.
gate array outputs the RESET signal to the reset port of the CPU and
also to the
gate array itself, via
the delay control
(CR circuit). The delay
circuit
of
and C72 and
the reset timing for the CPU and Type B interface card.
+35
reset circuit
Reset
monitors the +35
line. Normally, the dividing resistors (R27 and
input
approximately 1.7
to pin 2. When the detection
is 1.7
the +35
line drops into
the 22.9 V to 30.0 V range.
If this voltage
drops to
the RESET signal (LOW level) is output to the CPU’s
port. When the printer is turned off, this circuit operates and manages writing to the
-r
I
i
2
’
I
CPU
(ICI)
Figure 2-20. Reset Circuit
Diagram
i
Rev.
2-21
Содержание C117001-N - DFX 5000+ B/W Dot-matrix Printer
Страница 1: ...EPSON TERM NAL PR DFX 5000 NTER SERVICE MANUAL EPSON ...
Страница 152: ...DFX 5000 Service Manual Troubleshooting Table 5 5 C117 PSB PSE Board Assembly Component Repair continued Rev A 5 15 ...
Страница 153: ...Ttvublestmting mx 60 Serv ce Ahmu8J Table 5 5 C117 PSBIPSE Board Assembly Component Repair continued 6 16 Rev A ...
Страница 155: ...Troubleshooting DlW50 Service Wnual Table 5 6 C117 MAIN Board Assembly Component Repair continued u 5 18 Rev A ...
Страница 158: ...DFX 5000 Service Manual Troubleshooting Table 5 6 C117 MAIN Board Assembly Component Repair continued Rev A S 21 ...
Страница 159: ...Troubleshooting DF 50tM Service Manual Table 5 6 C117 MAIN Board Assembly Component Repair continued k f L J s 22 Rev A ...
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Страница 170: ...DFX 5000 Sewice Manual Maintenance and Lubrication In Figure 6 4 Lubrication and Adhesive Diagram 3 Rev A S 5 ...
Страница 180: ...DFX 5000 Service Manual Appendix O I 1 T I I J I Figure A 3 C117 PSB Board Assembly Circuit Diagram Rev A A 1 1 ...
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