IBM 4247, Maintenance Information

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Table 29. 18-Wire Printhead Resistance Measurements (continued)
Part Resistance Temperature
Column A Shifter Coil 11.7 Ohm ±5% 20°C (68°F)
Thermal Sensor 1000 Ohm ±6% 25°C (77°F)
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 Wire 1A Coil
3 Column A
Shifter Coil 4 Column B
Shifter Coil
5 Wire 2A Coil 6 Wire 2A Coil
7 Wire 3A Coil 8 Wire 3A Coil
9 Wire 4A Coil 10 Wire 4A Coil
11 Wire 5A Coil 12 Wire 5A Coil
13 Wire 6A Coil 14 Wire 6A Coil
15 Wire 7A Coil 16 Wire 7A Coil
17 Wire 8A Coil 18 Wire 8A Coil
19 Wire 9A Coil 20 Wire 9A Coil
21 Wire 9B Coil 22 Wire 9B Coil
Chapter 3. Circuit Diagrams
243