Epson LQ-510 Technical Manual page 175

TROUBLESHOOTING
5.3 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. Tables
5-5, 5-7, and 5-9 below are divided into the five following columns:
Problem:
Indicates the difficulty.
Symptom:
Indicates potential condition which may be underlying the problem. You must
check to see which if any of the symptoms apply.
Cause: Indicates the potential source of the problem.
Checkpoint: Perform this check to determine whether the problem is the result of the cause
listed at left.
Solution: Indicates the repair that will correct the fault.
Item
Driver Circuit
Checker E685
5.3.1 SANPS/SANPSE POWER BOARD UNIT REPAIR
The following chart shows the main components used on the SANPSE board.
Board Name
SANPS(E)
SANPS
SANPSE
5-10
Table 5-3. Troubleshooting Tools
Check the driver circuit by reading the LED indication.
Table 5-4. SANPS(E) Board Parts List
Location Part Names
IC1 L5431-AA
IC20 TL494CN
Q20 2SA1469
Q3, 21 2SA1020
Q2 2SC3746
R31, 32
Q1 2SC3831
DB1 D3SBA40
F1 ULTSC 2.0A-N1
T1 PT-P68A-NF
Q1 2SC3460
DB1 RBV-406
F1 BET 1.25A
T1 PT-P68E-NF
Description
Description
Adjustable Precision Regulator
PWM Control
Transistor 60 V 5 A 20 W
Transistor 50 V 2 A 900 mW
Transistor 60 V 5 A 20 W
Fusible resistor 2 ohms 1/4 W ± 5%
Transistor 500 V 10 A
Diode Bridge 400 V 4.0 A
Fuse 125 V 2.0 A
Transformer
Transistor 800 V 6 A 100 W
Diode Bridge 600 V 4.0 A
Fuse 1.25 A 250 V
Transformer
REV.-A
Part Number
B765113101
Part No.
X440164319
X440034940
X300146900
X300102009
X302374600
X175400207
X302383100
X340330120
X502061011
Y567204003
X302346000
X340400321
X502063040
Y567204002
LQ-510