Xerox DocuColor 2240, Service Manual

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09/03
4-166
DC 3535/2240/1632, WC M24
ADJ 9.2
Initial issue Repairs and Adjustments
ADJ 9.2 ATC Sensor Setup (dC921)
Purpose
CAUTION
This procedure should only be performed when the ATC Sensor or Developer Housing is being
replaced, OR when there is reason to believe that the calibration values in NVM are incorrect.
To set the calibration values [ATC Correction Coefficient], [ATC Correction Offset] in NVM to
calibrate the new ATC Sensor.
Check
1. If the ATC Sensor or Developer Housing was replaced, perform the first procedure listed
in
Adjustment
2. If there is reason to believe that the calibration values in NVM are incorrect, perform the
following:
a. Connect the PWS to the machine and enter Diagnostic Mode (refer to Entering Diag-
nostic Mode using the PWS ).
b. Under the Adjustments tab, select Max Setup .
c. Select the TC/ATC Sensor Setup tab.
d. Check the values in the bottom 4 rows of numbers in the window. The default values
for the NVM locations represented by these rows are:
• Initial Value of Sensitivity Gradient -753
• Initial Output Value at Standard TC - 160
• ATC Correction Coefficient - 1000
• ATC Correction Offset - 10000
e. If any row or any column on the screen displays all default values, perform second
procedure listed in
Adjustment
Adjustment
Procedure for new ATC Sensors
Perform these steps if you have just replaced an ATC Sensor or Developer Housing:
1. Connect the PWS to the machine and enter Diagnostic Mode (refer to Entering Diagnostic
Mode using the PWS ).
2. Under the Adjustments tab, select Max Setup .
3. Select the TC/ATC Sensor Setup tab.
4. Locate the ATC Sensor calibration code on the ATC Sensor. This is the 3-digit number in
the 3rd line of text on the label (it will always start with a zero).
5. Enter the last 2 digits of this code into the appropriate column of the first row.
6. Select the Read button.
7. Proceed to ADJ 9.3 , TRC Control/Toner Density Setup (dC922)
Procedure to restore ATC Calibration values
Perform 1 , 2, or 3 as appropriate if you need to restore ATC Sensor NVM calibration values:
1. If a known good Machine Settings floppy exists, use dC351 to restore Machine Settings.
2. If a known good floppy is not available, but the original (as delivered) ATC Sensors are
still in the machine, check the NVM Setting Value List in the Tray 1 pocket. Go to
dC131
and reenter the values for
• 752-069 through 752-072 (YMCK ATC Correction Coefficient)
• 752-073 through 752-076 (YMCK ATC Correction Offset)
• 752-709 through 752-712 (YMCK Initial Value of Sensitivity Gradient)
• 752-703 through 752-716 (YMCK Initial Output Value at Standard TC)
3. If one or more ATC Sensors have been replaced, or if you are not sure of the replacement
status, perform the following
a. Connect the PWS to the machine and enter Diagnostic Mode (refer to Entering Diag-
nostic Mode using the PWS ).
b. Under the Adjustments tab, select Max Setup .
c. Select the TC/ATC Sensor Setup tab.
NOTE: If the ATC Sensor or Developer Housing was replaced per the procedure, the Calibra-
tion tags will have been installed as shown in Figure 3 of REP 9.26 . This will eliminate the
need to remove the Developer Housings in the following step, to access the tag on the
ATC Sensors
d. Remove the Developer Housings ( REP 9.9 ).
e. Locate the ATC Sensor calibration code on the ATC Sensors. This is the 3-digit num-
ber in the 3rd line of text on the label (it will always start with a zero).
f. Enter the last 2 digits of this code into the appropriate column of the first row.
g. Select the Read button.