03/2003
6-15
8850/ 510DP
GP 7, GP 8
General Procedures
GP 8 Toner Control System Calibration
Introduction
This procedure should only be run when new developer material is installed or when the devel-
oper housing, toner sensor, or NVM are replaced. If there is a need to run it at any other time,
the number of feet of print that have been run on the material must be maintained as indicated
on the Display. Do NOT reset the INPUT FEET ON DEVELOPER to zero. This information is
important because the permeability of the developer increases as the developer ages, and
increases the toner concentration. The bias voltage of the toner sensor is adjusted to compen-
sate for these age changes to maintain the toner concentration at a set level. The developer
age is also important to determine additional bias voltage compensation adjustments in low
humidity conditions. When the system is set for less than 65% humidity, additional compensa-
tions are made at 20,000 and 30,000 feet. When the humidity is set above 65%, no additional
adjustments are performed. The meter will never exceed 30,000 feet (10,000 meters) because
no adjustments are made after the 30,000 feet (10,000 meters) life point is reached.
Purpose
The purpose is to calibrate the toner control system in order to maintain good print quality as
specified in Section 3 of this Service Manual.
Prerequisite
Electrostatic Series ADJ 9.2 must be performed before the Image Density is adjusted.
Adjustment
1. Enter diagnostics.
2. (Figure 1): Enter code [0921-7]. The following message is displayed.
Figure 1 Entering the Humidity Condition
a. (Figure 2): Estimate the humidity in the customer’s site then answer the question by
entering 1 or 3 using the numeric key pad. The following message will be displayed.
Figure 2 Confirming the Humidity Setup
9-56 00.0 ADDED DELAY
BETWEEN
PRINTS
0.0 - 25.5 Seconds
10-32 100 FUSER OIL WEB
RATE ADJUST-
MENT.
50-200
10-34 200000 ESTIMATED OIL
WEB REMAINING
LIFE
PRINT <FEET>
10-60 50 FUSER BOND
TEMP SETPOINT
0-99
10-62 50 FUSER VELLUM
TEMP SETPOINT
0-99
10-63 50 FUSER FILM
TEMP SETPOINT
0-99
Table 1 NVM Values Printed by GP 7
Diagnostic
Code Default Value Description Range of Values
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