REV.-A
5.3.2 Control Circuit
The control circuit can be repaired using the diagnostic tool to identify the problem. Table 5-7 lists the
main parts of the control circuit.
Table 5-7. Control Circuit Parts List
Location
Name
Description
4B
MPD78 10HG Main CPU 15 MHz
3A
E05A15HA Gate Array
7A
E05A16GA Gate Array
5A, 6A
HM6264ALSP
Static RAM 64K bit
2A
STK6722H
Hybrid
IC,
Carriage Controller
4A
27256 32K Byte P-ROM
Q1-Q9, Q16
2SC3987
60V
t
10V, 3A,
2W
Q15
2SB76SK
120V, 3A,
1.5W
Q17
2SB1318
100V, 3A,
1.2W
Q 18-Q21
2SD560(4)
120V, 5A, 1.5W
Q22, Q25, Q30
2SC1815 60V, 150mA,
400mW
Q23, Q24
2SA1015 50V, 150mA,
400mW
5.4.3 Model-3 B10/3B60 Printer Mechanism
Use the diagnostic tooI to detect malfunctions among the carriage motor, paper-feed motor, and sensor,
Table 5-8 lists the specifications for these components, use the printing test, and also inspect visually.
Table 5-8. Electric
Device List
Name Description
Carriage Motor
Type
4-phase, 200 pole stepper motor
Voltage :
Driving
+36VDC,
Holding . . .
+5VDC
Coil Resistance :
11
Q
&
7% (25
”C/phase)
Excitation : 1-2 phase, 2-2 phase
Paper Feed Type
4-phase, 48 pole stepper motor
Motor Voltage :
Driving
+36VDC,
Holding . . .
+5VDC
Coil Resistance :
78
Q
A7Q
(25
”C/phase)
Excitation :
2-2 phase
Plunger
Type
Solenoid
Voltage :
Driving . . .
+36VDC,
Holding . . .
+5VDC
No operation . . . OV
Coil Resistance :
22
f-l
*5%
(20”C)
5-20
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