Canon i9900, i9950 Service Manual
3-7
No. Signal
name
Function
Input/Output
1 to 3
VH2
Head drive power supply 20V
Out
4
DIA2
Diode sensor anode 2
In
5
EEPDI
Head EEPROM data signal
In
6
EEPDO
Head EEPROM data signal
Out
7
EEPSK
Head EEPROM serial clock signal
Out
8
EEPCS
Head EEPROM chip select signal
Out
9
DATA0
Head data PM even
Out
10
VDD
Head logic drive power supply 3.3V
Out
11 VHT
Head drive power supply 16V (short-circuiting with VH on
the logic board)
the logic board)
Out
12, 13
VH1
Head drive power supply 16V
Out
14 to 16
VH2
Head drive power supply 16V
Out
17
DIA3
Diode sensor anode 3
In
18
DATA17
Head data M1 odd
Out
19
DATA14
Head data Y even
Out
20
DATA13
Head data M2 odd
Out
21
DATA4
Head data BK even
Out
22
DIA0
Diode sensor anode 0
In
23
VDD
Head logic drive power supply 3.3V
Out
24 to 26
VH1
Head drive power supply 16V
Out
27
HE89
Heat enable M1, C1
Out
28 HE7
Heat
enable
Y
Out
29
HE56
Heat enable C2, M2
Out
30
LT
Transmission clock clutch signal
Out
31
DATA15
Head data Y odd
Out
32
DATA16
Head data M1 even
Out
33
DATA11
Head data C2 odd
Out
34
DATA8
Head data PC even
Out
35
DATA1
Head data PM odd
-
36
DIA1
Diode sensor anode 1
In
37
HE34
Heat enable G, PC
Out
38
HE2
Heat enable BK
Out
39
HE01
Heat enable PM, R
Out
40 to 42
GNDH2
Head GND
-
43
DIK
Diode sensor cathode
Out
44
DATA19
Head data C1 odd
Out
45
DATA10
Head data C2 even
Out
46
DATA9
Head data PC odd
Out
47
DATA2
Head data R even
Out
48
DATA5
Head data BK odd
Out
49 VSS
Logic
GND
-
50 to 52
GNDH1
Head GND
-
53 to 55
GNDH2
Head GND
-
56
CLK
Head transmission clock
Out
57
DATA18
Head data C1 even
Out
58
DATA12
Head data M2 even
Out
59
DATA7
Head data G odd
Out
60
DATA6
Head data G even
Out
61
DATA3
Head data R odd
Out
62 VSS
Logic
GND
-
63 to 65
GNDH1
Head GND
-