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Service Guide
59
No lights, no sound on power-up
If the printer shuts down with the power switch still on
, the printer may have
experienced a spurious over-current event. If the printer powers-up within
2 seconds, do nothing. If the printer powers-up after 6 seconds, the printer
power supply has auto-ranged to the 220 VAC setting. Remove the power cord,
wait 30 seconds, then reinstall the power cord. The printer should power-up at
its 110 VAC setting within two seconds. If it does not, replace the power supply.
If the fans “twitch” and the LEDs flash
, there may be a short in the power
supply system. Refer to the later procedure “Testing for shorted drivers” on
page 62.
If the fans do not move and the LEDs do not flash
, there is either no AC power
to the printer or the power supply has failed. Check the AC voltage. If replacing
the power supply does not correct the problem, refer to the later procedure
“Testing for shorted drivers” on page 62.
Verifying main board CPU operation
1.
If the printer does not power up (rear fan is off and power-up
diagnostic LEDs are off), go to the topic, “Verifying power supply
operation” on page 60.
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 POST 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 Phaser 840 printer’s left rear panel LED (the PS
LED) flashing in a specific pattern of long and/or short flashes and
repeated indefinitely. On the Phaser 850 printer, the front panel Error
LED is also used. Other failures are indicated by the failure being
printed on the Startup Page.
After successful power-up, the right LED flashes at a regular “heartbeat” rate.
The front panel
Ready
light is turned on, the LCD is turned on and the display
provides warm-up progress.
Verifying print engine operation by printing its startup
page
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 to Print
, scroll to
Menu
and press
Select.
Then scroll to the
Printer Configuration menu item, press
Select,
and then scroll and
select the
Startup Page
menu item
.
The printer should print out a
Startup Page.
If the printer prints a Startup Page, then the print engine is working correctly. If
the printer does not print a Startup Page, then a problem exists with the print
engine.
Summary of Contents for Phaser 840
Page 11: ...xii Phaser 840 and 850 Color Printers ...
Page 65: ...54 Phaser 840 and 850 Color Printers ...
Page 101: ...90 Phaser 840 and 850 Color Printers ...
Page 125: ...114 Phaser 840 and 850 Color Printers ...
Page 134: ...Service Guide 123 Clearing PostScript NVRAM menu item ...
Page 135: ...124 Phaser 840 and 850 Color Printers ...
Page 166: ...Service Guide 155 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 9 9 ...
Page 170: ...Service Guide 159 Figure 3 Paper path FRUs 0388 80 2 1 5 11 10 9 12 6 4 3 7 13 8 11a 11b ...
Page 172: ...Service Guide 161 Figure 4 Motor and fan FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 174: ...Service Guide 163 Figure 5 Circuit board FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 81 12 7a ...
Page 176: ...Service Guide 165 Figure 6 Solenoid and clutch FRUs 4 5 3 2 1 0388 23 ...
Page 182: ...Service Guide 171 Figure 9 High capacity PaperTray 0388 65a 1 2 ...