IBM 6400 Maintenance Information Manual page 91

Operator Panel
Message
101 UPPER DRIVER
SHORT
102 LOWER DRIVER
SHORT
105 HAMMER COIL
<number> OPEN
Table 4. Message List
Explanation
Hammer driver
circuits on the CMX
controller board are
shorted to ground.
Circuit(s) on the
hammer bank or in
the hammer bank
power cable are
shorted to ground.
Electrical malfunction
of one or more
hammer coils.
Corrective Action
1. 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.
1. 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.
1. 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.
Message List
91