M12 (Toner Supply) Control - Konica Minolta 7155 Service Manual

2. Signals
a. Input signals
(1) TONER_SIG (TLD to PRCB)
When the level of toner in the toner supply unit
becomes low, this signal goes low ([L]), display-
ing a message on the LCD connected to OB1
(operation board/1).
(2) TONERM_EM (M13 to PRCB)
M13 (toner bottle) abnormality detection signal
[L]: M13 is normal.
[H]: M13 is abnormal.
b. Output signals
(1) T_SENSE_CONT (PRCB to TLD)
TLD (toner level detection sensor) power control
signal
The TLD is powered only when it is detecting the
toner level.
(2) TONERM_CONT (PRCB to M13)
M13 (toner bottle) control signal
[L]: M13 ON
[H]: M13 OFF
(3) TONERM_CLK (PRCB to M13)
M13 (toner bottle) rotation speed control clock
signal
(4) TONERM_CW/CCW (PRCB to M13)
M13 (toner bottle) rotational direction indication
signal
[H]: CW direction rotation
[L]: CCW direction rotation

[4] M12 (Toner Supply) Control

DMLED CONT
DM MONI EX
DJLED CONT
DM SIG EX
DRUM JSIG EX
TNLED REF
PRCB
DCPS
M12 (toner supply) is controlled by the PRCB
(printer control board). Toner density is detected
by TCSB (toner control sensor board).
1. Operation
a. Toner density detection
The Dmax sensor (PD1) on the TCSB (toner
control sensor board) detects the density of the
toner control patch developed on the drum sur-
face to output the signal corresponding to the
detected density to PRCB (printer control board).
2-H-3
TONER SUPPLY UNIT
TNSM24V
TNSM24V
TNSM A
M12
TNSM AB
TNSM B
TNSM BB
12V
A.GND
TCSB
24V1
5V2
S.GND
P.GND