Table Of Contents - Sony STR-DE845 Service Manual
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Also See for STR-DE845:
- Service manual (78 pages) ,
- Operating instructions manual (62 pages) ,
- Training manual (61 pages)
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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" indication is 0.75
V, so analog meters must have an accurate low-voltage scale.
The Simpson 250 and Sanwa SH-63Trd are examples of a pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable. (See Fig. A)
0.15 µF
Fig. A. Using an AC voltmeter to check AC leakage.
MODEL IDENTIFICATION
- Rear View -
DE945: US model
DE945: Canadian model
DE845: US model
DE845: Canadian model
Downloaded from
www.Manualslib.com
To Exposed Metal
Parts on Set
1.5 kΩ
Earth Ground
M
odel
Malaysia and Singapore models
Chinese model
Australian model
E and PX models
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4-1. Block Diagram - MAIN Section (1/2) - ........................ 11
4-2. Block Diagram - MAIN Section (2/2) - ........................ 12
- DISPLAY/POWER SUPPLY Section - ...................... 13
Schematic Diagrams ...................................................... 14
4-5. Schematic Diagram - DIGITAL Board (1/3) - .............. 15
4-6. Schematic Diagram - DIGITAL Board (2/3) - .............. 16
4-7. Schematic Diagram - DIGITAL Board (3/3) - .............. 17
-DIGITAL Board (Component Side) ............................. 18
-DIGITAL Board (Conductor Side) ............................... 19
-VIDEO/JOINT (1) (H) Boards (DE845) - ................... 20
-VIDEO/JOINT (1) (H) Boards (DE845) - ................... 21
- OSD/OSD JOINT (H) Boards (DE945) - ................... 22
- OSD/OSD JOINT (H) Boards (DE945) - ................... 23
4-14. Printed Wiring Board - AU SW Board - ....................... 24
AC
4-15. Schematic Diagram - AU SW Board - .......................... 25
voltmeter
4-16. Printed Wiring Board - S-VIDEO Board - .................... 26
(0.75 V)
4-17. Schematic Diagram - S-VIDEO Board - ....................... 27
4-18. Printed Wiring Board -DISPLAY Board - .................... 28
4-19. Schematic Diagram - DISPLAY Board - ...................... 29
4-20. Printed Wiring Board - MAIN Board - ......................... 30
4-21. Schematic Diagram - MAIN Board (1/3) - ................... 31
4-22. Schematic Diagram - MAIN Board (2/3) - ................... 32
4-23. Schematic Diagram - MAIN Board (3/3) - ................... 33
V. SWITCH (E) Boards - ............................................... 34
V. SWITCH (E) Boards - ............................................... 35
/BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards - ....... 36
/BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards - ....... 37
4-28. Printed Wiring Boards -DC (1)/DC (2) Boards - .......... 38
4-29. Schematic Diagram -DC (1)/DC (2) Boards - .............. 39
Part No.
4-30. Printed Wiring Boards -AC/SP Boards - ....................... 40
4-31. Schematic Diagram - AC/SP Boards - .......................... 41
P
art No.
4-32. IC Pin Function Description ........................................... 46
4-226-871-0s
5.
4-226-871-1s
4-226-871-3s
6.
4-226-871-4s
4-226-871-5s
4-226-871-6s
4-226-871-7s
4-226-871-8s
TABLE OF CONTENTS
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