Epson LQ-2550 Technical Manual page 235

5.3.2 ROMA Board
The ROMA board can be repaired using the diagnostic tool. Table 5-11 lists the main parts of the ROMA
board.
Location
6A
5A
14C
9B
4A
3A
8A
9C
1 IB
2C
7C
7D
9A
10A
14A
2A
13A
7B
ZD 1
ZD4
ZD5
ZD6
Q 15,Q 16
Q20
CR 1,CR2
Table 5-11. ROMA Board Main Parts List
Classification
74LSO0
TTL
74 LS365A
TC74HC373P
Ic TL431 CLPB
M546 10P
Hybrid IC STK66082E
H8D2 148
STK6981 H
PS-RAM HM65256BSP-15
ST-RAM
Gate Array
E05A02LA
E05A09BA
CPU HD64 180R1 P6
PPD7810HG
Zenor Diode MA4043-L-TA
MA4300-H-TA
RD39JSB3
HZS39EB3-TD
MA4033-L-TA
Transistor 2SA 1020-TPE6
2SC 18 15Y-TPE2
2SD 1843-T
2SD 1521
2SD 1978-TZ
2SB 1093-T
2SA 10 15-TPE2
Ceramic O.S.C.
CSA 12.2MT-TF
Name
Refer to Table A-1.
4.03 - 4.26V 250mA 370mW
3 0 . 2 - 3 1.8V 250mA 370mW
3 8 . 9 9 - 40.99V 5A 400mW
36.0 - 37.85V 150mA 400mW
3 . 1 2 - 3.28V 250mA 370mW
50V 2A 900mW
50V 150mA 400mW
60V 1A 10W
50V 1.5A 10W
120V 1.5A 1.2W
80V 1.5A IW
80V 4A 40W
50V 150mA 400mW
12.2MHZ
5-23
REV.-A
Description