Xerox DocuPrint C55 Service Manual page 286

A B
9.7 BLACK DEVELOPMENT
1
PCU
PWB
PL 4.2
CN115
+24 VDC INTERLOCKED
1
BLACK MAGNETIC CLUTCH ON (L) +24 VDC
2
2
J4
CN107
J6 BLACK TONER SENSE SIGNAL
4
EB
GND
2
+5 VDC
1
3
F3
+5 VDC
NEW DEVELOPER SENSE SIGNAL
3
Chain 9.1
BLACK DEVELOPER BIAS
4
9.8 BLACK TONER CONTROL
PCU
PWB
PL 4.2
5
CN107
TONER MOTOR CLOCK A
13
4
TONER MOTOR CLOCK B
14
6
THE BLACK TONER SENSE SIGNAL MEASURES THE TONER CONCENTRATION IN THE BLACK DEVELOPER
1
HOUSING.
THE BLACK DEVELOPER LINK IS USED TO DETECT WHEN A NEW BLACK DEVELOPER MODULE IS
2
INSTALLED. IT MELTS OPEN AND STARTS THE BLACK DEVELOPER COUNT.
THE PCU PWB CHANGES THE DEVELOPER BIAS IN ORDER TO CHANGE THE IMAGE DENSITY. IT USES
3
INPUT FROM THE GAMMA SENSOR TO DETERMINE THE CHANGE REQUIRED.
THE BLACK TONER MOTOR IS CONTROLLED BY THE BLACK TONER SENSE SIGNAL. IT DETERMINES
4
WHEN TO RUN THE TONER MOTOR.
7
THE CLOCK A AND CLOCK B SIGNALS ARE APPROXIMATELY 12 VDC WHEN MEASURED TO GROUND.
THE CLOCK A AND CLOCK B SIGNALS ARE APPROXIMATELY 22 VAC WHEN MEASURED ACROSS A & B
BSDs
Chain 9 Xerographics
C D
BLACK
DEVELOPER MAGNETIC
CLUTCH
PL 5.1
BLACK DEVELOPER
ASSEMBLY
CN1001
3
1
4
7
KDEV. LINK
2
1
3
8
RED
CASSETTE BLACK TONER
PWB MOTOR
PL 3.1 PL 13.1
CN201 CN202 FT1003
1 1 1
MOT
2 3 2
FT1004
E F G
BLACK
MAGNETIC
CLUTCH
Status
Description
Codes
J4 The Black toner is low.
J6 The Sense signal is out of range.
EB The Black Developer is misinstalled.
2/99
7-12
H J
BLACK TONER
MOTOR
PCU PWB
XEROGRAPHICS
CHAIN 9 LEVEL 2
SHEET 4 0F 10
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