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5061
Step
Actions and questions
9
Check the voltage at connector J6-16 when the yellow
TMC switch is pressed.
Does the voltage measure approximately +3.3 V dc?
10
Check the developer HVPS to system board cable for
damage, broken connections, or wire and shorts
between adjacent pins.
Are there any signs of damage to the cable?
11
Disconnect the developer HVPS cable from connector
J6 on the system board. Measure the voltage on
connector J6-16 on the system board.
Does the voltage measure approximately 0 V dc?
943.xx error code service check
•
943.01—black toner metering cycle (TMC) problem
•
943.05—black TMC timeout problem
Toner metering cycle (TMC) is where the code and electronics in the printer sense an addition of toner in the
cartridge developing area. If the printer is expecting a toner addition cycle but one is not detected, a 94x TMC
Error is displayed.
Replacement of the cartridge may fix the problem temporarily if the problem is with the printer. Only replace the
cartridge if there are no problems with the printer or if the cartridge is known to be defective.
Note: Before proceeding with this service check, observe the error log for repetitive occurrences of a 94x
service error.
Step
Actions and questions
1
Check the toner metering cam (A) on the rear of the
black cartridge.
Note: In some cartridges, the toner metering cam is
black. Is the cam present on the cartridge?
2-62
Service Manual
A
Yes
No
Go to step 10
Go to step 11
Replace the
Replace the
cable.
developer HVPS
board. See
"Developer
HVPS board
removal" on
page
Replace the
Replace the
system board.
developer HVPS
See
"System
and developer
board removal"
HVPS to system
on page
4-89.
board cable.
Yes
No
Go to step 2
If the toner
metering cam is
not present,
check the printer
to make sure it is
not inside.
Replace the
damaged
cartridge.
4-39.
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