Epson FX 890 Service Manual - Page 28

C229MAIN Board Circuit - printer driver

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FX-1180/FX-880 Service Manual Chapter 2 Operating Principles 2.3.2 C229MAIN Board Circuit The C229MAIN board is the control circuit board of this printer. This board consists of several IC chips and drivers, as shown in the table below: Table 2-3. Function of the Main IC Element TMP96C141AF E05B50 PST594E AT93C46 PSRAM ROM SLA7024M A2917SEB Comparator Location IC3 IC2 IC1 IC4 IC5 IC7 IC8 IC11 IC12 Function 16 bit CPU runs at 14.47MHz - Main controller - Detectors control - CR Motor Control Gate array : System Controller - Parallel I/F control - Option Type-B I/F control - Panel Switch, LED control - Printhead Control - PF Motor Control - CR Motor Current control Reset IC : Hardware reset function EEPROM : System control data (Market, TTL threshold, Bi-D setting, Page length, TOF, etc.) containing 1M/4M bit - Buffer and Working area of CPU & Gate array 2/4M bit EPROM/ Mask ROM - Control program containing CR Motor driver PF Motor driver Power-off signal sensing P r in th e a d T h e r m is to r H e a d D r iv e r CG PSRAM O p e r a tio n P anel P a r a lle l I/F T y p e -B I/F ( O p tio n ) G .A . E 05B 50 (IC 2 ) A d d r e s /D A T A B u s ROM R e s e t IC CPU TM P 96C 01A F (IC 3 ) EEPRO M P F M o to r D r iv e r C R M o to r D r iv e r + 3 5 V D e te c to r P G D e te c to r R ear P E D e te c to r F ro n t P E D e te c to r H P D e te c to r R e le a s e L e v e r D e te c to r Figure 2-5 . C229MAIN Board Circuit Block Diagram Rev. B 2-5

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FX-1180/FX-880 Service Manual
Chapter 2 Operating Principles
Rev. B
2-5
2.3.2 C229MAIN Board Circuit
The C229MAIN board is the control circuit board of this printer. This board consists of several IC
chips and drivers, as shown in the table below:
Table 2-3. Function of the Main IC
Element
Location
Function
TMP96C141AF
IC3
16 bit CPU runs at 14.47MHz
- Main controller
- Detectors control
- CR Motor Control
E05B50
IC2
Gate array : System Controller
- Parallel I/F control
- Option Type-B I/F control
- Panel Switch, LED control
- Printhead Control
- PF Motor Control
- CR Motor Current control
PST594E
IC1
Reset IC
: Hardware reset function
AT93C46
IC4
EEPROM
:
System control data (Market, TTL threshold, Bi-D setting, Page
length, TOF, etc.) containing
PSRAM
IC5
1M/4M bit
- Buffer and Working area of CPU & Gate array
ROM
IC7
2/4M bit EPROM/ Mask ROM
- Control program containing
SLA7024M
IC8
CR Motor driver
A2917SEB
IC11
PF Motor driver
Comparator
IC12
Power-off signal sensing
E
E
P
R
O
M
P
a r a lle l I/F
Type-B
I/F
(O
p tio n )
O
p e r a tio n
P
anel
P
F M
o to r
D
r iv e r
C
R
M
o to r
D
r iv e r
H
e a d D
r iv e r
P
r in th e a d
H
P
D
e te c to r
R
e le a s e
L e v e r D
e te c to r
P
G
D
e te c to r
R
e a r
P
E
D
e te c to r
F r o n t
P
E
D
e te c to r
+35V
D
e te c to r
R
O
M
A
d d r e s /D
A
TA
B
us
C
G
P
S
R
A
M
Therm
is to r
G
.A
.
E
05B
50
( IC
2)
C
P
U
TM
P
96C
01A
F
( IC
3)
R
e s e t IC
Figure 2-5 . C229MAIN Board Circuit Block Diagram