is part of the manual is very useful for repairing
Here are circuit diagrams
if there is damage, I recommend using this part of the
a complete list of circuit boards and components
Notes: 1. Column numbers match the physical arrangement of the columns on the print wheels. 2. Column numbers are assigned from 1 to 18 from the frame motor side. 3. Pin numbers are assigned from 1 to 27 from the frame motor side. 4. The spark arrestor diode is connected as shown below.
7
9
M
23
Motor power supply (+) Detector power supply (+) Timing signal Detector power supply (�)
8
10
24
Electromagnet (+)
Driver
9
11
25 26
10
12
(Example of compatible diode: 1S2075K or equivalent)
11
13
27
Motor power supply (�)
12
14
Motor power ON/OFF
*1
0.2ms max.
Timing signal
*2 8.0ms min.
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10 T11 T12
TS
T(0)
0.7ms max. 8 0.7ms max. 0.7ms max.
0.7ms max.
80.0ms min.
2.0ms min.
Character selective magnet No.n Ribbon shift magnet
(Print operation) (Normal paper feeding operation)
Typ. 285.7ms
Notes: 1. The signals in must be prepared by the user. 2. The pulse is indicated by a dot-dash line (*1) is generated for continuous printing. The next print cycle can start immediately after the leading edge of the timing signal Ts. 3. As shown by a dashed line (*2), the timing signal may go low at motor power-on or upon reception of a Print command. �9�
