REV.-A
Power On
CPU Self Reset
t
i
Vmml
Figure 2-20. /RESET Signal Timing
2.3.3 Sensor Circuits
Figure 2-21 shows the sensor circuits in block diagram form. When the printhead temperature exceeds
the maximum allowed value, the TEMP2 signal and other signals, such as the CRHOME signal, are sent
directly to the CPU. The +35 V line signal passes through the reset circuit before it reaches the CPU.
Terminals
P50
to
P55
in the CPU are used for the A/D converter. The
Vref
circuit generates the A/D
converter reference voltage
Vref.
CPU (Ic)
P55
CRHONE 58
p’4~pE2
‘7
“2~’E’
5’
P34
GAP 50
P31
LEVER 31
RESET
PST 529C (3B)
+35V
Line 17
P50
T28
4.741 v
Vref
Vref
Circuit
Figure 2-21. Sensor Circuit Block Diagram
2-18
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