IBM 4247 Maintenance Information page 243

Table 29. 18-Wire Printhead Resistance Measurements (continued)
Part
Column A Shifter Coil
Thermal Sensor
Example: To measure the resistance of the coil for print wire 1A, measure between pins 1 and 2 of the 22-pin
cable connector.
Table 30. 22-Pin Printhead Connector
(18-Wire Printhead)
Pin Names Pin Names
1 Wire 1A Coil 2
3 Column A 4
Shifter Coil
5 Wire 2A Coil 6
7 Wire 3A Coil 8
9 Wire 4A Coil 10
11 Wire 5A Coil 12
13 Wire 6A Coil 14
15 Wire 7A Coil 16
17 Wire 8A Coil 18
19 Wire 9A Coil 20
21 Wire 9B Coil 22
Resistance
11.7 Ohm ±5%
1000 Ohm ±6%
Wire 1A Coil
Column B
Shifter Coil
Wire 2A Coil
Wire 3A Coil
Wire 4A Coil
Wire 5A Coil
Wire 6A Coil
Wire 7A Coil
Wire 8A Coil
Wire 9A Coil
Wire 9B Coil
Temperature
20°C (68°F)
25°C (77°F)
Chapter 3. Circuit Diagrams
243