No Reaction At Power Up - Intermec EasyCoder PD4 Service Manual

14.3 No Reaction at Power Up

Intermec EasyCoder PD4—Service Manual
The electronics compartment contains high voltages wires and circuitry.
Whenever possible, disconnect the power cord to eliminate the risk of
electric shock and short circuits before removing the left-hand panel.
When is necessary to test function while the power is on, be extremely
careful to avoid electric shock and never work alone!
Description:
There is no visible reaction when the power to the printer is switched on.
• The Power LED does not light up.
• There is no text in the display window (if any).
Possible Causes and Suggested Remedies:
• No power in AC wall socket.
- Check with some other electrical device or a voltage meter.
• Power cord connectors not completely inserted in printer's power cord
receptacle or in wall socket.
- Disconnect and fi rmly connect both ends of power cord. Try again.
• Faulty power cord.
- Replace and try again.
• Power switch or cables to power module defect.
- Using a voltage meter, check voltage between black and white wire in
the connector at the power module end of the cable harness.
• Defect power module.
- Check fuse F1 on power module. If blown, replace only once with a
5A slow fuse. If it blows again, replace the entire power module.
- Check 24 VDC output on CN2 on the power module between line
and ground (there are 3 red line wires and 3 black ground wires). If
there is no +24V, replace the entire power module.
• Power Supply overload.
- Too high a temperature in the power module. Leave the power on and
wait for the power supply to cool off (may take up to half an hour).
When the temperature returns to normal, the printer will automati-
cally restart. If the error persists, examine the power module.
• Cable between main board and power module not properly connected
or damaged.
- Check that the cable between CN2 on the power module and CN28
on the main board is properly connected.
- Check 24 VDC output in the socket at the main board end of the
cable (there are 3 red line wires and 3 black ground wires). If there is
no +24V, the cable is damaged.
Chapter 14—Troubleshooting
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