Sensor Operational Check - Brother FAX-750 Service Manual

3.8

Sensor Operational Check

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Function
This function allows you to check that the seven sensors (document front sensor, document rear
sensor, cover sensor, paper ejection sensor, paper-edge sensor, ribbon sensor, and hook switch
sensor*) operate correctly.
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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 sounds 1100 Hz and 400 Hz tones cyclically through the following volumes for
testing the speaker.
If the sensing status are as listed below, the LCD will show the following:
"FRERCJMPHRX 1" on the FAX-910
"FRERCJMPHRXHK 1" on other models
Given below is the relationship between the LCD indication, sensor name and sensor status.
LCD
FRE
RC
JM
PH
RX
HK
(2) Change the detecting conditions and check that the displayed letters disappear. For example,
insert a document through the document front (or rear) sensor and check that the "F" ( or "E")
of the FRE disappears.
(3) To stop this operation, press the Stop key. The equipment beeps for one second and returns
to the initial stage of the maintenance mode.
Sensors
Document front and rear sensors
Cover sensor
Paper ejection sensor
Paper-edge sensor
Ribbon sensor
Hook switch sensor
(*In the FAX-910, the hook switch sensor serves no function.)
No document detected.
Recording paper cover ASSY closed.
No paper jam.
Recording paper loaded or paper front cover opened.
Ribbon cartridge loaded.
On-hook state.
V - 52
In this area a numeral appears, indicating
the number of communications records
printed out at the factory for testing.
Sensing status