Verifying Printer Operation By Using Its Self-Test Print; Verifying Power Supply Operation; Measuring Power Supply Voltages - Tektronix Z740/N - Phaser 740 Color Laser Printer Service Manual

Verifying printer operation by using its self-test print

1. If not already on, turn on the printer. If the printer does not power up, or
does not initialize, or the printer initializes but the motors do not run
properly, go to the next topic "Verifying power supply operation."
2. When the Ready message is displayed, press the Menu button to enter the
menu.
3.
Press the scroll buttons to navigate to the Test Prints menu item. Select any
test print.
4.
Press Print to print a test prints. The printer should print a test page from
the image processor memory.
If the printer prints a test pattern, then the print engine and image processor are
working correctly and the printer's problem resides with the network or host
interface. Refer to the appropriate topics in Chapter 3 "Verifying the Printer and Host
Connections."

Verifying power supply operation

Required tools
#1 Phillips screwdriver
Volt-ohm-meter (VOM)
Verifying the power supply involves four steps:
Measuring the input and output voltages.
Checking the power supply fuse(s).
Checking its safety interlocks.
Testing for a shorted motor which would shut down the power supply or
damage the engine control board.

Measuring power supply voltages

1.
Turn off the printer and unplug it from its power outlet.
2. AC Input: With the VOM set to measure AC voltages, measure for 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).
3.
Power supply fan: With the power switch on, is the main fan running? If
not, check the fan's wiring harness (CN9) to the engine control board; it
should measure 24 VDC. If the voltage is not correct, replace the engine
control board. Otherwise, replace the power supply fan.
Service Guide
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