Print Engine Troubleshooting; Verifying Main Board Cpu Operation; Table 6-1 Main Board Power Up Self-Test Error Codes - Tektronix Phaser 360 Service Manual

Print engine troubleshooting

Verifying main board CPU operation

Table 6-1 Main board power up self-test error codes

Left LED Meaning
flashes
Long flash =5
Short flash=1
2L+1S=11
not used
1
2 DRAM SIMM
Presence
3 DRAM SIMM 0
9. The printhead tilts forward and a purge cycle begins.
10. A cleaning page is printed.
11. The front panel displays a message that the printer is initializing and
then ready.
The print engine is initialized.
This topic is a step-by-step procedure for systematically verifying particular
aspects of a printer's operation. Following this procedure should lead to the
cause of a printer's failure.
1.
If the printer does not power up (rear fan is off and power-up
diagnostics LEDs are off), go to the later topic, "Verifying power
supply operation" on page 6-6.
2. Observe the rear panel LEDs located on each side of the rear panel DIP
switches. The left LED represents the operation of the PostScript firmware.
The right LED represents operation of the main board's print engine
firmware. During the tests the two LEDs toggle back and forth for each
successful pass through each DRAM test. A failure in the power on
self tests is indicated by the left LED (the PS led) flashing in a specific
pattern of long and/or short flashes and repeated indefinitely. A long
flash represents a 5 while a short flash is a one. For example, a long
flash followed by 4 short flashes is 5 + 4 = 9. If the left LED repeatedly
flashes in the same sequence then the PostScript processor has
encountered an error and is looping. The possible LED-encoded error
codes are listed in the following table. Other failures are indicated by
the failure being printed on the Startup page.
3. After successful power-up, the left LED flashes at a regular
"heartbeat" rate. The front panel Power light is turned on, the Error
light is flashed, and the LCD is cleared.
Details
This test verifies for the presence of both DRAM SIMMs. If both DRAM SIMMs are
missing the resultant error indication is 2 short flashes from the left LED.
This test verifies the entire DRAM SIMM located at bank 0.
Troubleshooting
Service Manual 6-3
6