Brother FAX-931, MFC-970MC, FAX-921 service manual Sensor Operational Check Function, Fre

3.8Sensor Operational Check

nFunction

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.)

nOperating 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

In this area a numeral appears, indicating

"FRERCJMPHRXHK 1" on other models the number of communications records printed out at the factory for testing.

Given below is the relationship between the LCD indication, sensor name and sensor status.

LCD Sensors Sensing status

FRE	Document front and rear sensors
RC	Cover sensor
JM	Paper ejection sensor
PH	Paper-edge sensor
RX	Ribbon sensor
HK	Hook switch sensor

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.

(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.

V - 52