Brother 8250P - FAX B/W Laser Printer Service Manual page 147

3.8 Sensor Operational Check
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Function
This function allows you to check whether the eight sensors (document front sensor, document
rear sensor, sheet feeder cover sensor, cover sensor, registration sensor, paper ejection sensor,
toner sensor, and hook switch sensor*) operate correctly.
In the FAX-8250P/MFC-9050, the LCD shows the "FRRETCCVRGHATN" when
- the document front sensor detects no paper (FR),
- the document rear sensor detects no paper (RE),
- the sheet feeder cover is closed (TC),
- the top cover is closed (CV),
- the registration sensor detects no paper (RG),
- the paper ejection sensor detects no paper (HA), and
- the toner sensor detects toner (TN).
In other models, the LCD shows the "FRRETCCVRGHATNHK" when
- the document front sensor detects no paper (FR),
- the document rear sensor detects no paper (RE),
- the sheet feeder cover is closed (TC),
- the top cover is closed (CV),
- the registration sensor detects no paper (RG),
- the paper ejection sensor detects no paper (HA),
- the toner sensor detects toner (TN), and
- the hook switch sensor detects the on-hook state (HK).
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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.
In the FAX-8250P/MFC-9050, the LCD should show "FRRETCCVRGHATN" if the detecting
conditions of the seven sensors are as defined above.
In other models, LCD should show "FRRETCCVRGHATNHK" if the detecting conditions of
the eight sensors are as defined above.
(2) Change the detecting conditions (e.g., insert paper through the document sensors or the
registration sensor, open the sheet feeder cover or the top cover, jam paper at the paper
outlet, remove the toner cartridge, and lift up the handset), 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 maintenance mode, press the
Stop key.
(*The FAX-8250P/MFC-9050 has no hook switch sensor.)
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