Brother MFC-7050C, Service Manual

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3.5 Sensor Operational Check
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Function
This function allows you to check that the following 13 sensors operate correctly.
- Document front sensor
- Document rear sensor
- Cover sensor
- Registration sensor
- Hook switch
- Carrier home position sensor
- Ink empty 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
sounds 1100 Hz and 400 Hz tones cyclically through the following volumes for testing the
speaker:
If the sensors are ON as listed below, the LCD will show "FRRECVHKENCREP" which can be
switched by pressing the
Start key.
Given below is the relationship between the LCD indication, sensor name and sensor status.
LCD Sensors Sensor signal ON
FR Document front sensor No document detected.
RE Document rear sensor No document detected.
CV Cover sensor Top cover closed.
HK Hook switch On-hook state.
EN Registration sensor No recording paper detected.
CR Carrier home position sensor Carrier placed in the home position.
EP Ink empty sensor No reflection light received (since no paper is inserted),
which is equivalent to detecting of a printed ink-empty
mark.
(2) Change the detecting conditions and check that the displayed letters disappear. For example,
insert a document through the document front sensor and check that the "FR" disappears.
(3) To stop this operation and return the equipment to the initial stage of the maintenance mode,
press the Stop key.