Canon i9900, i9950 Service Manual
3-3
JCR1 (Print Head 1/3 [Carriage Unit])
No. Signal
name
Function
Input/Output
1 GND
GND
-
2 ENCA
CR
encoder
phase
A
In
3
WIDTH
CDR sensor signal
In
4
ENCB
CR encoder phase B
In
5
EEPSK
Head EEPROM serial clock signal
Out
6
EEPDI
Head EEPROM data signal
Bus
7
SNPOW
Encoder power supply 3.3 V
Out
8
VDD
Head logic drive power supply 3.3V
Out
9
EEPCS
Head EEPROM chip select signal
Out
10
CLK
Head data transmission clock signal
Out
11 AD_TH
Thermistor
signal
In
12
DIA0
Diode sensor anode 0
In
13
LT
Transmission clock clutch signal
Out
14
DIA1
Diode sensor anode 1
In
15
HE89
Heat enable M1, C1
Out
16 HE7
Heat
enable
Y
Out
17
HE56
Heat enable C2, M2
Out
18 DATA15
Data
Y
odd
Out
19
DATA19
Data C1 odd
Out
20
DATA18
Data C1 even
Out
21
DATA17
Data M1 odd
Out
22
DATA16
Data M1 even
Out
23 DATA14
Data
Y
even
Out
24
DATA12
Data M2 even
Out
25
DATA10
Data C2 even
Out
26
DATA13
Data M2 odd
Out
27
DATA11
Data C2 odd
Out
28
DATA4
Data BK even
Out
29
DATA0
Data PM even
Out
30 DATA9
Data
PC
odd
Out
31
DATA8
Data PC even
Out
32 DATA1
Data
PM
odd
Out
33
DATA2
Data R even
Out
34
HE2
Heat enable G, PC
Out
35
DATA5
Data BK odd
Out
36
HE34
Heat enable BK
Out
37
HE01
Heat enable PM, R
Out
38
DATA7
Data G odd
Out
39
DATA6
Data G even
Out
40 DATA3
Data
R
odd
Out
JCR2 (Print Head 2/3 [Carriage Unit])
No. Signal
name
Function
Input/Output
1 to 8
GNDH1
GND
-
9
CDRPOW
CDR sensor power supply
Out
10
JIA3
Diode sensor anode 3
In
11 GND
GND
-
12
VHT
Head drive power supply 20V
Out
13 to 20
VH1
Head drive power supply 20V
Out