Xerox Phaser 840, Service Manual, Page: 148 / 287

4 - 132 Phaser 840/850/860/8200 Color Printer - Service Manual
Cap Vacuum (Test ID# 7) - This test uses the head tilt mechanism to measure the vacuum
decay time. Refer to the printhead troubleshooting section or the Printhead checklist for detailed
troubleshooting steps.
Test ID# R# Definition Results Interpretation/Actions
Cap Vacuum
ID# 7
0 No vacuum pull
current > 200 Something may be obstructing
the printhead tilt mechanism.
< 20
1 Slack take-up
postion > 1600 Something may be obstructing
the printhead tilt mechanism
< 40
2 Vacuum bleed off
time
> 8000
There may be a problem with the
air solenoid or clogged tubbing.
Run the test a second time
before concluding that there is a
failure. If the tubing is ok replace
the vacuum module.
< 3000
There may be a leak in the
vacuum system or inadequate
peak vacuum. Run the test a
second time. Inspect and replace
the cap/wipe/purge or tubing as
needed. If no problem is seen,
replace the vacuum module.
Cap Axis Geometry (Test ID# 8) - This test measures the alignment of the Cap/Wipe/Purge
assembly.
Test ID# R# Definition Results Interpretation/Actions
Cap Axis
Geometry
ID# 8
0
Right belt
hysteresis > 75 Verify cap/wipe/purge belt
alignment and tension.
< 20
1 Process Motor no
load current > 61
Excessive torque required with
no load, run the Cap Axis Drive
Test.
2
Left belt
hysteresis > 120 Verify cap/wipe/purge belt
alignment and tension.
< 50
3
Cap tilt > 160 Verify cap/wipe/purge belt
alignment and tension.
< 40
Cap Axis Drive (Test ID# 9) - This runs successive cycles of the Cap/Wipe/Purge drive system
at low current levels to determine the minimum drive current.
Test ID# R# Definition Results Interpretation/Actions
Cap Axis Drive
ID# 9
0
Paper path motor
drive current at
end scan
> 0.87 All Tests:
Inspect for obstructions or
binding in the cap/wipe/purge
system.
1 Scan cycles < 3
2
Cap axis
hysteresis > 0
< -0.1
3 Plus position loss
> 0.120
< -0.120
4
Minus position
loss > 0.120
< -0.120
Table 4-4 Check Menu Value Key