Toner density sensor service check
Action Yes No
Step 1
Remove the transfer roll, and check for loose toner blocking the toner
density sensor.
Is it free of loose toner?
Go to step 2. Clean the sensor.
Step 2
Check the toner density sensor for proper operation:
a Lower the ACM assembly.
b Move the toner density sensor wiper from left to right.
Does it move freely?
Go to step 3. Reinstall the wiper
properly. If it still
cannot move freely,
replace the toner
density sensor. See
“Toner density sensor
removal” on page
221.
Step 3
Check the toner density sensor cable for proper connection to the
controller board.
Is it properly connected?
Go to step 4. Reseat the cable.
Step 4
Check the toner density sensor cable for damage and pinch points.
Is it free of damage?
Replace the controller
board. See “Controller
board removal” on
page 187.
Replace the toner
density sensor. See
“Toner density sensor
removal” on page
221.
133 errors
133 error messages
Error code Description Action
133.05 CTLS reading above maximum expected value. Go to
“CTLS service check” on page 91.
133.06 CTLS reading below minimum expected value.
133.08 Excessive CTLS noise.
4514
Diagnostic information
90
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