Adj 9.1 Ea "Tone Down" Procedure - Xerox DocuPrint C55 Service Manual

ADJ 9.1 EA "TONE DOWN"
PROCEDURE
PURPOSE
The purpose of this procedure is to " Tone Down"
the color developer. It is also used to put the
printer back in operation after an EA fault.
INITIAL ACTION
Refer to GP 3.2 in Section 6 and make sure that
the Patch Control is switched off.
CHECK
1. Enter Normal diagnostics.
TEST PRINT program and press Form Feed
[1] to run a test print. While the print is
running, observe the KT=__, CT=__, MT=__,
YT=__ values.
2. If any of the three color (C, M, Y) toner
concentration values are below 10, that color
is overtoned. Continue with Step 3 to correct
the overtoned condition.
3. With TEST PRINT displayed press Enter [7].
4. Use the Menu [3] key to scroll to MULTI
OFF. Press Next [6] until the display
indicates MULTI ON. (This will put the
TEST PRINT program in the multicopy
mode.)
5. Use the Menu [3] key to scroll to TONER
ON. Press Next [6] until the display
indicates TONER OFF. (This will shut off all
toner dispensing.)
6. Press Media Server [2] to return to TEST
PRINT, then press Form Feed [1] to make
multiple Test Prints.
7. Observe the KT=__, CT=__, MT=__, YT=__
values. The values should begin to " count
up" as toner is used and not replenished.
DocuPrint C55/C55mp/[NC60]
8. When the lowest value reaches 10, press
Media Server [2] to stop the Test Prints.
9. Switch the Printer off and then on.
10. If the Printer Boots without the EA fault,
continue with step 11. If the printer still has
the EA fault, repeat steps 3 through 10 and
run multiple test prints with the toner off until
the toner concentration value in question
increases and the EA fault no longer occurs.
Scroll to the
11. Print a diagnostic sheet.
a. (C55/C55mp)
Patterns, Diagnostics.
b. [NC60] Menu Up, to Service, Value Up
to Diag Summary, Enter.
13. Compare the Toner Concentration Control
Point with the Toner Concentration Value. If
any of the C, M, Y Values are 15 points
below the Control Point this color is
overtoned, continue with this procedure.
14. Run the color step pattern for the color that is
overtoned
a. (C55/C55mp)
Patterns, Pattern Type, PCL, (overtoned
color) Step. Run at least 25 prints.
b. [NC60] Menu Up to Service, Item Up to
test Patterns, Value Up to (overtoned
color) Step. Run at least 25 prints.
15. Repeat steps 11 through 13 until the Toner
Concentration Value is within 10 to 15 points
of the Control Point.
NOTE: This procedure puts the toner concentra-
tion back within the controlling range.
problem reoccurs, refer to GP 3.2 in section 6 to
verify that Patch Control is off and the refer to the
EA RAP if necessary.
Off Line, Service, Test
Off Line, Service, Test
2/99
4-67
If the
REPAIRS/ADJUSTMENTS
ADJ 9.1