IBM 6400-I15 Maintenance Manual - Page 94
Circuits on the hammer bank or in the hammer bank power cable are shorted
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Page 94 highlights
101 UPPER DRIVER SHORT 1. Hammer driver circuits on the CMX controller board are shorted to ground. Cycle power. If the message appears, press Stop. If the message does not clear, replace the hammer bank logic cable and the hammer bank power cable assemblies. 2. Power on the printer. If the message appears, replace the CMX controller board. Record the message and return it with the defective board. 3. Power on the printer. If the message appears, replace the shuttle frame assembly. 102 LOWER DRIVER SHORT 1. Circuit(s) on the hammer bank or in the hammer bank power cable are shorted to ground. Cycle power. If the message appears, press Stop. If the message does not clear, replace the hammer bank logic cable and the hammer bank power cable. 2. Power on the printer. If the message appears, replace the shuttle frame assembly. 3. Power on the printer. If the message appears, replace the CMX controller board. Record the message and return it with the defective board. 105 HAMMER COIL OPEN 1. Electrical malfunction of one or more hammer coils. Cycle power. If the message appears, replace the shuttle frame assembly. 2. Power on the printer. Run a print test. If the message appears, replace the CMX controller board. Record the message and return it with the defective board. 94 Troubleshooting
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