2-16
4227-100
Intermittent Problem Service Check
FRU/Symptom
Action
1
The machine
sometimes fails
before POST is
complete.
Check for the following:
1. Loose connectors. Reconnect all
connectors to the main and sub logic
boards.
2. Electrical noise or static discharge.
Check the following items:
• Power supply ground.
• Machine frame ground.
• Printer interface cable is grounded and
shielded.
3. Intermittently low voltages. Check for ac and
all dc voltages and short circuits on the main
and sub logic boards.
a. Check the electrical voltage and ensure
that it is within tolerance.
b. Check the continuity of the power
cord.
c. Disconnect the power supply cable
from the connectors CN11 on the
main logic board and CN1 on the sub
logic board. Turn the printer power on
and check all dc output voltages at
CP11 and CP1.
Ensure the output voltages are:
CP11-1 (+40 ±4 V dc) & CP11-3 (GND)
CP11-2 (+40 ±4 V dc) & CP11-3 (GND)
CP11-5 (+5 ±0.5 V dc) & CP11-6 (Signal GND)
CP 1-1 (+40 ±4 V dc) & CP1-3 (GND)
CP 1-2 (+40 ±4 V dc) & CP1-3 (GND)
CP 1-5 (+5 ±0.5 V dc) & CP1-6 (Signal GND)
If the voltages are not correct, replace the
Power Supply Unit.
If the failure remains, replace the main logic
board and sub logic board.
Note: When replacing the main logic board,
always set the
“Bidirectional Print Adjustment”
and the
Summary of Contents for 4227-100
Page 10: ...x 4227 100 Korean Safety Information...
Page 101: ...Connector Locations 5 1 4227 100 5 Connector Locations...
Page 105: ...Connector Locations 5 5 4227 100 Component Location Illustrations...
Page 106: ...5 6 4227 100 Component Location Illustrations Continued...
Page 114: ...5 14 4227 100 Connector Block Diagram...
Page 119: ...Parts Catalog 7 2 Assembly 1 Covers and Operator Panel...
Page 121: ...Parts Catalog 7 4 Assembly 2 Paper Feed...
Page 123: ...Parts Catalog 7 6 Assembly 3 Carrier...
Page 125: ...Parts Catalog 7 8 Assembly 4 Base and Electronics...
Page 127: ...Parts Catalog 7 10 Assembly 5 ASF Side Frame Covers...
Page 129: ...Parts Catalog 7 12 Assembly 6 ASF Roller Support...
Page 131: ...Parts Catalog 7 14 Assembly 7 Tractor 2 Option...