Sensor Operational Check - Brother MFC7050C Service Manual

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
FR
RE
CV
HK
EN
CR
EP
(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.
Sensors
Document front sensor
Document rear sensor
Cover sensor
Hook switch
Registration sensor
Carrier home position sensor
Ink empty sensor
Sensor signal ON
No document detected.
No document detected.
Top cover closed.
On-hook state.
No recording paper detected.
Carrier placed in the home position.
No reflection light received (since no paper is inserted),
which is equivalent to detecting of a printed ink-empty
mark.
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