Print Engine Troubleshooting; Verifying Main Board Cpu Operation; Table 6-1 29K Processor Power Up Self-Test Error Codes - Tektronix Phaser 340 Service Manual

Print engine troubleshooting

Verifying main board CPU operation

8. The heaters are enabled and the drum begins to rotate.
9. The cap/wipe/purge assembly is positioned to the purge position.
10. The printhead tilts forward and a purge cycle begins.
11. A flush page is printed.
12. 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 turns and power-up
diagnostics begin flashing their LEDs), go to the later topic, "Verifying
power supply operation" on page 6-5.
2.
Observe the left rear panel LED. The left LED represents the operation
of the 29K processor. During normal power-up, the LED flashes twice
and then stays lighted. If the LED repeatedly flashes in the same
sequence then the 29K processor has encountered an error and is
looping. The possible LED-encoded error codes are listed here:

Table 6-1 29K processor power up self-test error codes

Left LED flashes Meaning
1 CPU interrupt
2 ROM checksum
3 DRAM data path
4 DRAM address path
5 Interprocessor communication
(IPC)
After successful power-up, the left LED flashes at a regular "heatbeat"
rate. The front panel Power light is turned on, the Error light is
flashed, and the LCD is cleared.
Troubleshooting
Service Manual 6-3
6