Canon i550 Service Manual page 43

2.3.3 Print head
Pin No. Signal Name
1, 2, 8 - 13 GNDH
19, 20 GNDH
3 DATAC
4 DATALC
5 DATALK
6 DATAY
7 DATALM
14 TSOCLC
15 BG
16 HDSEN
17 HCLK
18 DATAM
21 HELKX
22 HELCX
23 HECX
24 3.3V
25, 36 GND
26 VSS- A
27 VDD- A
28 HEMX
29 HELMX
30 HEYX
31 - 33, 39 - 42 VH
48 - 50 VH
34 3.3V
35 DHE
37 TSOLMC
38 TSOLMM
43 E_CS
44 E_SK
45 E_DI
46 E_DO
47 VHT
50
10
Figure 3-9 Print Head
Function
Head GND
Head GND
CDATA
LCDATA
LKDATA
YDATA
LMDATA
C, LC status output
Transfer clock clutch signal
Head sensor signal
Head transfer clock
MDATA
LK heat enable
LC heat enable
C heat enable
Logic 3.3V
GND
M heat enable
LM heat enable
Y heat enable
16V head power supply
16V head power supply
Logic 3.3V
Dummy nozzle drive signal
LM, C status output
LM, M status output
Head EEPROM chip select
Head EEPROM clock signal
Head EEPROM data signal
Head EEPROM data signal
Short with VH on logic board
3 - 15
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