Epson Stylus COLOR 900 Service Manual page 54

EPSON Stylus COLOR 900/900N
2.3.4.2 Sensor Circuits
The printer's sensors detect temperature and the mechanical status of
the printer. The CPU receives the temperature feedback, while two
ASICs receive the mechanical feedback: E05B59 (IC2) and E05B60
(IC3).
T h e r m i s t o r o n t h e h e a t
s i n k o n t h e m a i n b o a r d
T h e r m i s t o r o n t h e m a i n b o a r d
1 1 2
A N 7
1 1 1
A N 6
1 1 0
A N 5
1 0 9
A N 4
H D 6 4 F 2 3 5 7 ( I C 1 )
A N 3
1 0 8
A N 2
1 0 7
A N 1
1 0 6
A N 0
1 0 5
C N 8
1 9
H D S A M I
2 1
H P D S A M I
2 0
T H M
1
A N O D E 1
2
A N O D E 2
9
A N O D E 3
1 0
A N O D E 4
4
A N O D E 5
C N 9
Figure 2-15. Temperature Sensor Support Circuitry
Temperature Feedback
The temperature feedback circuit includes three thermistors as well as
the temperature sensing circuitry in the nozzle selector inside the
printhead. Their functions are explained on the following page.
N o z z l e R o w s
R o w A
R o w D R o w E
R o w B R o w C
Chapter 2 Operating Principles
T h e r m i s t o r
N o z z l e
S e l e c t o r
49