RJ-901C/RJ-900C Maintenance Manual 9 Troubleshooting
9-33
9.3 Troubleshooting Without Error Messages
This section describes the symptoms of errors without an error message as well as the check items and
recovery actions.
9.3.1 Initial Operation Problems
Table 9-9 Symptoms, Check Items and Actions for Initial Operation Problems
No. Symptom Check item Action Reference
1 Machine power
cannot be turned ON
1. Is operation panel
unit assembly cable
broken or shorted?
Replace panel cable. "4.2.2
Removing
Operation
Panel Unit"
p.4-8
2. Panel unit assembly
may be damaged.
Replace panel unit
assembly.
"4.2.2
Removing
Operation
Panel Unit"
p.4-8
3. Inlet assembly may
be defective.
Replace inlet assembly. "4.3.5
Replacing
Inlet
Assembly"
p.4-24
4. Power board
assembly may be
defective.
Replace power board
assembly.
"4.3.4
Replacing
Power Board
Assembly"
p.4-22
2 Abnormal LCD
operation (no
displays/garbled
characters)
1. Check power supply
voltage (AC100V).
Replace power board
assembly.
"4.3.4
Replacing
Power Board
Assembly"
p.4-22
2. Check power supply
voltage (DC5V).
Replace power board
assembly.
"4.3.4
Replacing
Power Board
Assembly"
p.4-22
3. Check power supply
voltage (DC24V,
DC42V).
Replace power board
assembly.
"4.3.4
Replacing
Power Board
Assembly"
p.4-22
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