Verifying Print Engine Operation By Using Its Test Print; Verifying Power Supply Operation; Measuring Ac Voltages - Tektronix Phaser 380 Service Manual

6
Troubleshooting

Verifying print engine operation by using its test print

Verifying power supply operation

6-6 Phaser 380 Color Printer
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 6-24.
Required tools
Philip #1 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 fuse.
Testing DC output voltages.
Testing for a shorted DC output supply which shuts down the power
supply.
Testing for a shorted motor which shuts down the power supply.

Measuring AC 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. 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
rear panel voltage switch is correctly set.