Toner Meter Cycle (Tmc) Card; Toner Meter Sensors (Y, C, M, K) On Tmc Card - Lexmark C540n Service Manual

Toner meter cycle (TMC) card

Step Questions / actions
Perform the Base Sensor Test:
1
1. Enter Diagnostics menu (turn the printer
off, press and hold
the printer on, and release the buttons
when the installed memory and processor
speed displays).
2. Select Base Sensor Test, and press
Select ( ).
3. Select the sensor you want to test, open
the toner door, remove the corresponding
toner cartridge, and press Select (
4. Note whether the operator panel shows a
change in state.
Note: If the reflective disk is not showing
on the cartridge, rotate the gear clockwise
to expose the reflective surface.
For additional information about the Base
Sensor Test, see
page 3-16.
Does the operator panel display a change of
state?

Toner meter sensors (Y, C, M, K) on TMC card

Step Questions / actions
Remove the toner cartridge, and inspect the
1
lenses on the toner meter cycle (TMC) card.
Are the lenses blocked, damaged, or dirty?
Turn the printer off, and remove the rear
2
shield. See
"Top cover assembly removal"
4-13. Turn the printer on, and
on page
measure the values below at JCTM1 during
POR:
Pin
1
2
3
4
5
6
Are any of the values incorrect?
and Select ( ), turn
).
"Base Sensor Test" on
JCTM1
Value
+5 V dc
+3.3 V dc
+3.3 V dc
+3.3 V dc
+3.3 V dc
Ground
Yes
Replace the toner cartridge.
Yes
Repair or replace the TMC
card. See
"Toner meter
cycle (TMC) card removal"
on page 4-75.
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
5025-2xx, 4xx
No
Replace the toner meter
cycle (TMC) card. See
"Toner meter cycle (TMC)
card removal" on
page 4-75.
No
Go to step 2.
Replace the TMC card. See
"Toner meter cycle (TMC)
card removal" on
page 4-75.
Diagnostic information
2-53
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