Specifications

REV.-A
2.3.2 Reset Circuit
When the power in turned on, the reset IC(MB3771 ), which monitors the + 5 VDC line, keeps outputting
RESET signals until +5
VDC is stable. This controller can also reset itself by setting RSTRG signal(160
pin of
E05A65 gate array) to LOW. The block diagram of this circuit is shown in Figure 2-39.
+5V
GA
A
MB3771
E05A65
IC21
IC12
160 6 8
RSTRG
RESET
Figure 2-39. Reset Circuit Block Diagram
2.3.3 Detection Circuit
This printer is provided with 1 sensors, but only 7 sensors are described in this section. They are Ink
Cartridge Sensor, Ink End Sensor, Platen Gap Sensor, Friction/Tractor Select Sensor, Top Edge Sensor,
Paper End Sensor (Front), and Paper End Sensor (Rear). The signals from these sensors are directly
inputted to the CPU port.
For the other sensors, refer to each circuit as follows.
●
●
●
●
Ink temperature detector (Thermistor)
---Head drive circuit
+ 35VDC under voltage detection
circuit---EEPROM control circuit
Case open sensor (interlock switch)
---Head drive circuit /Carriage
Encoder
---Carriage motor drive circuit
motor drive circuit
IE2
“3
PT7
CPU
E PT6 V25+
GAP
PT5
IC5
Ffi
PT4
EDGE
PT3
PE PT2
PE(Rear)
PT1
Figure 3-40. Detection Circuit Block Diagram
2-31