3-78 Phaser 6121MFP Service Manual
Error Messages and Codes
Troubleshooting Procedure Table
Step Action and Questions Yes No
1 Check the Engine Control Board
connectors P/J18 and P/J19.
Are the connectors seated properly?
Go to step 2. Reseat the
connectors. If
the problem
persists, go to
step 2.
2 On the Engine Control Board, check:
■ P/J19-1 for +24V
■ P/J18-10 and -11 for +5V
Are the voltages present?
Go to step 4. Go to step 3.
3 On the Engine Control Board, check
P/J2-2 for +5 V. Check P/J2-1, -5, and -7
for +24V.
Are the voltages present?
Go to step 4. Replace the
Power Supply
(page 8-72). If
the problem
persists, go to
step 4.
4 Replace the Laser Unit.
Does the problem persist?
Go to step 3. Complete.
5 Replace the Engine Control Board. Complete.
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