Epson SQ-B50/2550 Technical Manual page 229

REV.-A
5.3 SANPS/SANPSE POWER BOARD UNIT REPAIR
This section indicates the points to be checked in response to problems, and the measures to be taken
based on the result of the check. Utilize the checkpoints to determine and correct defective components.
Table 5-6 is divided into the five following columns:
• Problem:
• Symptom:
• Cause:
• Checkpoint:
• Solution:
Indicates the problem
Indicates potential condition which may be underlying the problem. You must check
to see which if any of the symptoms apply.
Indicates the potential cause of the problem.
Perform this check to determine whether the problem is the result of the cause listed
at left.
Indicates the repair that will correct the fault.
The Table 5-3 shows the main components used on the SEIPS/SANPSE boards.
Table 5-5. SEIPS/SANPSE Board Parts List
Board
Location Parts Name Description Parts No.
Name
SEIPS/ IC 1 L5431-AA Adjustable Plesison REG. X440164319
SANPSE IC20
TL494CN PWM Control
X440034940
020 2SA1469 Transistor 60V 5A 20W X300146900
03,21 2SA1020 Transistor 50V 2A 900mW
X300102009
02 2SC3746 Transistor 60V 5A 20W X302374600
R31,32 Fusible resistor 2 ohm 1/4W
±
5%
X175400207
SEIPS 01
2SC3831 Transistor 500V 10A
X302383100
DB 1 D3SBA40 Diode Bridge 400V 4.0A
X340330120
F1 ULTSC 2.0A-N 1 Fuse 125V 2.0A X502061011
T1
PT-P68A-NF Transformer
Y567204003
SANPSE 01
2SC3460 Transistor 800V 6A 100W
X302346000
DB1 RBV-406 Diode Bridge 600V 4.0A
X340400321
F1
BET 1.25A Fuse 1.25A 250V
X502063040
T1 PT-P68E-NF Transformer Y567204002
5-9