Brother FAX 750, Service Manual

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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.
(*In the FAX-910, the hook switch sensor serves no function.)
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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 Sensors Sensing status
FRE Document front and rear sensors No document detected.
RC Cover sensor Recording paper cover ASSY closed.
JM Paper ejection sensor No paper jam.
PH Paper-edge sensor Recording paper loaded or paper front cover opened.
RX Ribbon sensor Ribbon cartridge loaded.
HK Hook switch sensor On-hook state.
(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.
In this area a numeral appears, indicating
the number of communications records
printed out at the factory for testing.