Brother HL-4000CN Service Manual page 116

5.9.2 Reference diagram
SWITCH TCRU ASSY(Y)
S-HVPS
PWBA EEPROM STD
SENSOR TONER LOW(Y)
SENSOR TONER LOW(M)
SENSOR TONER LOW(C)
SWITCH TCRU ASSY(M)
SWITCH TCRU ASSY(C)
SWITCH TCRU ASSY(K)
SENSOR TONER LOW(K)
III-38
TONER CARTRIDGE ASSY(Y)
TONER CARTRIDGE ASSY(M)
TONER CARTRIDGE ASSY(C)
TONER CARTRIDGE ASSY(K)
HOLDER TONER CARTRIDGE ASSY(4)
(Toner Motor : K)
HOLDER TONER CARTRIDGE ASSY(3)
(Toner Motor : C)
HOLDER TONER CARTRIDGE ASSY(2)
(Toner Motor : M)
HOLDER TONER CARTRIDGE ASSY(1)
(Toner Motor : Y)
Fig.3-42