Lexmark C77x Service Manual page 345

C77/c78 series
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"System board" on page
Connector
J20
Bottom options connector
Waste toner full
Media size
JETH1
Ethernet port
JMMY1
Yellow printhead mirror motor
5-7.
Pin no.
Signal
1
Printer TXD
2
Ground
3
Ground
4
Printer RXD
5
+24V_OPTIONS (Through fuse F11)
6
Ground
7
+5V_OPTIONS (Through fuse F9)
8
Staging Encoder
9
ITU_CLNR_FULL
10
N/C
11
Ground
12
WASTE_BTL_PRES
13
TRAY_SIZE_3
14
Ground
15
TRAY_SIZE_2
16
TRAY_SIZE_1
17
Ground
18
+3.3 V dc (Through fuse F13)
19
MEM_DATA (I²C Data to Media Size Card)
20
MEM_CLK (I²C Clock to Media Size Card)
1
FUSE24V
2
Ground
3
Ground
4
+5 V dc (through fuse F12)
5
Y MMSTART
6
Y HSYN-SOS
7
Y MMLOCK
8
Ground
9
Y MMREF
10
N/C
5061
5-13
Connector locations

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