Power Supply Unit Failures - Intermec EasyCoder PF2i Service Manual

15.5 Power Supply Unit Failures

Intermec EasyCoder PF2i, PF4i, and PF4i Compact Industrial—Service Manual
Description:
The printer refuses to print.
• The message "Temperature high please wait"(FP) or "Printhead hot"
(IPL) appears in the display window.
The power supply unit contains wires and circuits with dangerous
voltages. For safety reasons, it is strictly forbidden to try to repair a
power supply unit or to replace a blown fuse. Generally, in a primary-
switched power supply, a blown fuse is an indication that components
in the power supply has been damaged or degraded. Even if you could
get the power supply working by replacing a fuse, there is a risk that it
soon will fail again and more components will be damaged. Therefore,
whenever a fuse blows, always replace the entire power supply unit.
Possible Causes and Suggested Remedies:
• Power Failure Interrupt signal activated because of a Power Supply
overload.
- Too high a temperature in the power supply unit, for example caused
by extreme ambient temperatures (possibly in connection with
large black areas in the print image, high speed printing, and media
that require a high energy level), triggers the automatic overheating
protection switch.
Leave the power on and wait for the power supply to cool down (may
take up to half an hour). When the temperature returns to normal,
the printer will automatically restart. If the error persists, examine the
power supply (also see Chapter 12).
Description:
The printer stops working or functions are unstable.
• The power LED is unstable, weak or not lit.
• Stepper motor does not run.
• No or very weak printout.
Possible Causes and Suggested Remedies:
• Wrong or missing voltages from power supply.
- Check voltages using the test points on the CPU board (see Chapter
13.4).
- Check the cable between the power supply unit and the CPU board.
If the cable is OK, replace the power supply unit.
- Blown fuse in power supply. Replace the entire power supply unit.
Do not replace a blown fuse and do not attempt to repair the power
supply unit (see "Warning" notice).
- Stepper motor driver damaged because the platen roller has been
manually rotated while power was on. Replace PSU.
Chapter 15—Troubleshooting
213