Hvu Error; 926(K), 927(C), 928(Y), 929(M) - Toner Sensor Error - Lexmark C920 Service Manual

5056-XXX

925 - HVU Error

Step Questions/actions
1 Has the high voltage power board (HVU) been
removed/replaced?
2 Is connector CN9 on the printer controller board
connected properly?
3 Did replacing the printer controller board fix the
problem?

926(K), 927(C), 928(Y), 929(M) - Toner Sensor Error

92x Service
Toner Sensor
Step Questions/actions
1 Is the toner cartridge the correct type for the printer?
2 Is the toner cartridge encoder wheel dirty?
3 Replace the toner cartridge for the color with the error.
Did this fix the problem?
4 Test the sensors.
While actuating the sensor, does the voltage fluctuate
between 0 V and +5 V between pins 1 and 4 and 5, 8
and 9, 12, and 13 on CN1 on the printer controller
board.
2-12
Service Manual
Yes No
Inspect the Go to step 2.
secondary card
on the high
voltage board
(HVU) for a
broken
component
(Q906). Replace
the high voltage
board (HVU) if
necessary.
Replace the Plug the
printer controller connector in
board. securely.
Go to step 3.
Problem solved. Replace the high
voltage power
board (HVU).
Yes No
Go to step 2. Recommend the
customer replace
the cartridge with
the correct type.
Clean the Go to step 3.
encoder wheel
and toner sensor.
Problem solved. Go to step 4.
Replace the Replace the
printer controller affected toner
board. sensor.