Sensor Operational Check - Brother IntelliFax-4750 Service Manual

3.9

Sensor Operational Check

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Function
This function allows you to check whether the nine sensors (eight sensors on European models)--
document front sensor, document rear sensor, cover sensor, registration sensor, toner sensor,
paper ejection sensor, hook switch sensor*, manual insertion sensor, and cassette sensor--operate
correctly.
(*European models have no hook switch sensor.)
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Operating Procedure
(1) Press the 3 and 2 keys in this order in the initial stage of the maintenance mode. The
equipment beeps 1100 Hz and 400 Hz tones cyclically through the following volumes for
testing the speaker.
NOTE: To stop beeping, press the Function key (American models) or Menu key (European
models).
If the sensing status are as listed below, the LCD will show the following:
"DFDRCVRSTNPOHKR2" and "MNCSC2" (which can be switched by pressing the Start
key) on American models
"DFDRCVRSTNPO
key) on European models
Given below is the relationship between the LCD indication, sensor names and sensor status.
LCD
DF
DR
CV
RS
TN
PO
HK
R2
MN
CS
C2
(**These error indications will always be displayed in models not equipped with a 2nd paper cassette.)
(2) Change the detecting conditions (e.g., insert paper through the document sensors or the
registration sensor(s), open the front cover, remove the toner cartridge, jam paper at the
paper outlet, lift up the handset*, insert paper manually through the paper slot, and load the
paper cassette(s)), and then check that the indication on the LCD changes according to the
sensor states.
(3) To stop this operation and return the equipment to the initial stage of the maintenance mode,
press the Stop key.
NOTE: If you have opened and closed the front cover during the above procedure, you need to
open and close the front cover again upon completion of the procedure.
R2" and "MNCSC2" (which can be switched by pressing the Start
Sensors
Document front sensor
Document rear sensor
Cover sensor
Registration sensor
Toner sensor
Paper ejection sensor
Hook switch sensor*
2nd registration sensor**
Manual insertion sensor
Cassette sensor
2nd cassette sensor**
Sensing status
No document detected.
No document detected.
Front cover closed.
No paper detected.
No toner detected.
No paper jam.
On-hook state.
No paper detected.
No paper detected.
No paper cassette loaded.
No paper cassette loaded.
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