Print Head Replacement - IBM 5150 Hardware Maintenance Manual

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Print Head Replacement
1.
2.
~3.
4.
5.
6.
7.
Insert feet
lit
on print head into opening on carriage.
Pivot lock lever
II
counterclockwise while pressing down
on print head.
Connect print head cable
II
at connector.
Replace top cover (See page 3-90).
Replace ribbon cartridge.
Replace access cover.
Replace forms rack.
Note: Broken wires may be the result ofother problems. If a print head
has been replaced because of a broken wire, perform the
following steps to prevent damaging the newly installed
print head.
1. Remove the top cover. Disconnect CN6 on the driver
control card. Check for 22 ohms resistance between pin
CN6-10 (male end) and pins CN6-1 through 9. Replace the
print mechanism assembly if there are any shorts or opens.
2. Power on. Check for +24 Vdc at pins CN6-1 through 9 on
driver card (use ground pin for common lead). If any pin has
+24 Vdc, replace the control cards. If all pins read 0 Vdc,
power off and reconnect CN6. Print head circuitry is
functional.
3-79

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