Page 1
2
SS-US501/SW-US501/UZ-US501
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
Notes on chip component replacement
Never reuse a disconnected chip component.
Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
Unleaded solder melts at a temperature about 40 C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!
Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges oc-
cur such as on IC pins, etc.
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder. SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, metallized knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The limit indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k -¦ 0.15 Β΅F AC
voltmete r (0.75 V) To Exposed Metal
Parts on Set
Earth Ground
Page 2
3
SS-US501/SW-US501/UZ-US501
TABLE OF CONTENTS
1. SERVICING NOTE
................................................. 3
2. GENERAL .................................................................. 4
3. DISASSEMBLY
3-1. Disassembly Flow........................................................... 6
3-2. Top Chassis..................................................................... 6
3-3. DIGITAL Board.............................................................. 7
3-4. Front Cabinet Section..................................................... 7
4. TEST MODE ............................................................. 8
5. DIAGRAMS
5-1. Block Diagram - MAIN Section -................................ 9
5-2. Block Diagram
- DISPLAY/POWER SUPPLY Section -...................... 10
5-3. Note for Printed Wiring Boards and
Schematic Diagrams....................................................... 11
5-4. Printed Wiring Board - DIGITAL Board -................... 12
5-4. Schematic Diagram - DIGITAL Board (1/5) -............. 13
5-5. Schematic Diagram - DIGITAL Board (2/5) -............. 14
5-6. Schematic Diagram - DIGITAL Board (3/5) -............. 15
5-7. Schematic Diagram - DIGITAL Board (4/5) -............. 16
5-9. Schematic Diagram - DIGITAL Board (5/5) -............. 17
5-10. Printed Wiring Board - DISPLAY Board -.................. 18
5-11. Schematic Diagram - DISPLAY Board -..................... 19
5-12. Printed Wiring Board - AMP Board -.......................... 20
5-13. Schematic Diagram - AMP Board -............................. 21
5-14. Printed Wiring Board
- SUB Board (Except US model) -................................ 22
5-15. Schematic Diagram
- SUB Board (Except US model) -................................ 22
6. EXPLODED VIEWS
6-1. Overall Section................................................................ 33
6-2. Front Cabinet Section..................................................... 34
6-3. Main Section................................................................... 35
6-4. Rear Chassis Section....................................................... 36
6-5. Front/Surround Speaker Section..................................... 37
7. ELECTRICAL PARTS LIST .............................. 38
FRONT
CENTER
SURROUND
RLUSB
OPTICAL INANALOG IN SPEAKERRL
- Rear View -
PA R T No.
SECTION 1
SERVICING NOTE
-MODEL IDENTIFICATION
MODEL PART No.
UK model (WHITE) 4-254-202-0 []
Singapore model 4-254-615-0 []
Hong Kong model 4-254-915-0 []
AEP model (BLACK) 4-255-268-0 []
UK model (BLACK) 4-255-269-0 []
US model 4-255-394-0 []
AEP model (WHITE) 4-255-469-0 []
