Tech Service Bulletin No. A172/A199 – 20 REISSUE +
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Page 3 of 3
PROCEDURE continued
Toner Sensor Gain = Vcnt
BK Y M C
6. While checking the Vt in SP Data Output page 1, make copies of the C4 test chart (11x17/FC mode) until
the Vt stabilizes at |Vref – Vt| ≤ 0.2V.
7. Wait 5 minutes, then perform the process control self check.
8. If necessary, perform the ACC and the printer gamma adjustment.
NOTE
: When you replace developer on a machine that you have performed this procedure on, do not
change the setting for the Vcnt correction (keep the Vcnt correction off), and do not set the Vcnt
compensation value manually. The Vcnt compensation value returns to 0 (no correction) when developer
initial setting is performed. If Vcnt compensation value is lowered after developer initial setting, image
density will be too light.
When replacing developers it is important to remember to set Vref to 2.50 for
all colors for initialization
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PRODUCTION MACHINES:
This procedure has not been performed on production machines. The troubleshooting procedure described
in this bulletin is to be performed only when the symptom for light copies is found in the field.
174 164 166 164
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