Xerox Phaser 840 Service Manual page 125

Phaser 860 Only - Step 5 is as follows, for the 840/850 go to step 6.
Check the purge performance.
a.
BEFORE running the diagnostic test, empty the Waste Bin. Enter
diagnostic mode and select the "Cap Vacuum" test from the check menu.
Results should be:
R0 - (normally 20 - 200)
R1 - (normally 40 - 1600)
R2 - (normally 3000 - 8000)
Select "Unlock DM Tray" from the function menu. Remove the
b.
maintenance tray and note whether or not a normal volume of ink was
purged from the printhead.
The purge volume for the 860 is about half as much as the 840 or
Note
850.
Are either R0 or R1 outside their range? If yes, something may be
c.
obstructing the printhead tilt mechanism. R0 is a measurement of the
current needed to tilt the printhead. R1 measures the amount of gear train
slack in the tilt mechanism.
Was the purge volume low, or is R2 less than 3000? If yes, there may be a
d.
leak in the vacuum system or inadequate peak vacuum. This could be due
to:
Misaligned CWP due to improper belt alignment or CWP motion problem.
I
Damaged CWP gasket
I
Plugged or leaking tubing (holes/cracks in tubing)
I
Defective vacuum module
I
Inspect and replace the CWP or tubing as needed. Note that it may take up to 6 purges
before a new CWP runs at optimal performance. If no problem is seen replace the vacuum
module.
Is R2 greater than 8000? If yes, there may be a problem with the air
e.
solenoid or clogged tubing. If the tubing is okay, replace the vacuum
module.
After exiting diagnostics there may be some color mixing as the
Note
Cap Vacuum test does not do a complete series of faceplate wipes.
Printing Service Print 8 - Solid Fills and/or performing an
Eliminate Light Stripes should resolve this.
Troubleshooting 3 - 109