Brother DCP-6690CW, Service Manual, Page: 367 / 506

9-21 Confidential
Given below is the relationship between the LCD indication, sensor name and sensor
status.
*
1
The "CR" is always displayed even on models not equipped with a carriage motor driver thermistor.
*
2
For duplex print models
(2) Change the detecting conditions (e.g., open the scanner cover or insert paper through the
registration sensor or remove the ink cartridges), and then check that the indication on the
LCD changes according to the sensor states.
(3) To stop this operation and return the machine to the initial stage of the maintenance mode,
press the Stop/Exit key.
LCD Sensors Sensing status
DF Document front sensor No document detected.
DR Document rear sensor No document detected.
CV Scanner cover sensor Scanner cover closed.
RS Registration sensor No recording paper detected.
CC Ink cartridge cover sensor Ink cartridge cover closed.
P1 Purge cam switch Any of the cam driving positions
CP Cap lift cam switch Any of the cam driving positions
IK Black ink cartridge detection sensor Black ink cartridge loaded.
IY Yellow ink cartridge detection sensor Yellow ink cartridge loaded.
IC Cyan ink cartridge detection sensor Cyan ink cartridge loaded.
IM Magenta ink cartridge detection sensor Magenta ink cartridge loaded.
EK Black ink empty sensor Black ink remaining
EY Yellow ink empty sensor Yellow ink remaining
EC Cyan ink empty sensor Cyan ink remaining
EM Magenta ink empty sensor Magenta ink remaining
B4 Document width sensor No B4 or greater document detected.
VT Head thermistor Driver chip temperature within the
allowable range.
CR Carriage motor driver thermistor
*1
Normal temperature detected.
TH Casing internal temperature thermistor Normal temperature detected.
PP Switchback paper detection sensor
*2
No recording paper detected.
RR DX cover sensor
*2
DX cover closed.
DX DX cam switch
*2
Ordinary recording paper path
(DX flapper in a horizontal position)