Verifying Print Engine Operation By Using Its Test Print; Verifying Power Supply Operation; Measuring Power Supply Voltages - Tektronix Phaser 340 Service Manual

Verifying print engine operation by using its test print

Verifying power supply operation

1.
If not already on, turn on the printer. If the printer does not begin
initializing, go to the topic, "Verifying power supply operation"
below.
2. Once the Power light is on (not blinking) and the front panel displays
Ready , press the Menu button and scroll to the Startup page . menu
item and then press Print . The printer should print out a test print.
If the printer prints a test page, then the print engine is working correctly. If the
printer does not print a test print, then a problem exists with the print engine.
Proceed with the topic, "PC-based diagnostics" on page 6-27.
Required tools
TORX T-20 screwdriver
Volt-ohm-meter (VOM)
The power supply is divided into two sections: the AC section used for heaters
and the DC section for control logic, printhead drivers and motors. Verifying the
power supply involves five steps:
Checking for proper AC voltage.
Inspecting the power supply fuses.
Testing DC output voltages.
Testing for a shorted DC output supply which shut down the power
supply.
Testing for a shorted motor which shuts down the power supply.

Measuring power supply voltages

Warning AC line voltages are present on the power supply and possibly in
the printer, via the heaters, while the printer is plugged into an AC
outlet, even if the power switch is off.
1. Turn off the printer and unplug it from its power outlet.
2. AC Input: With the VOM set to measure AC voltages, measure the
power being supplied to the printer. It should measure between 87 to
128 VAC (115 VAC nominal) or 174 to 250 VAC (220 VAC nominal).
Ensure that the switch is correctly set.
3.
Remove the right side cabinet panel to access the wiring harnesses
plugged into the print engine control board.
Troubleshooting
Service Manual 6-5
6