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
2.A
3.Measuring the voltage drop across a resistor by means of a VOM or
To Exposed Metal
Parts on Set
0.15 ∝ F |
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| 1.5 k Ω | AC |
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| (0.75 V) |
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Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
MODEL IDENTIFICATION
– Rear View –
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| Model | Part No. |
DE945: | US model | |
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DE945: | Canadian model | |
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DE845: | US model | |
DE845: | Canadian model | |
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| Malaysia and Singapore models | |
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| Chinese model | |
| Australian model | |
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| E and PX models | |
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| TABLE OF CONTENTS |
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1. | GENERAL | 4 |
2. | DISASSEMBLY | 6 |
3. | TEST MODE | 9 |
4.DIAGRAMS
Block Diagram – MAIN Section (1/2) | 11 | |
Block Diagram – MAIN Section (2/2) | 12 | |
Block Diagram |
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| – DISPLAY/POWER SUPPLY Section | 13 |
Note for Printed Wiring Boards and |
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| Schematic Diagrams | 14 |
Schematic Diagram – DIGITAL Board (1/3) | 15 | |
Schematic Diagram – DIGITAL Board (2/3) | 16 | |
Schematic Diagram – DIGITAL Board (3/3) | 17 | |
Printed Wiring Board |
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| 18 | |
Printed Wiring Board |
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Printed Wiring Boards |
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Schematic Diagram |
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| 21 | |
Printed Wiring Boards |
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| – OSD/OSD JOINT (H) Boards (DE945) | 22 |
Schematic Diagram |
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| – OSD/OSD JOINT (H) Boards (DE945) | 23 |
Printed Wiring Board – AU SW Board | 24 | |
Schematic Diagram – AU SW Board | 25 | |
Printed Wiring Board – | 26 | |
Schematic Diagram – | 27 | |
Printed Wiring Board | 28 | |
Schematic Diagram – DISPLAY Board | 29 | |
Printed Wiring Board – MAIN Board | 30 | |
Schematic Diagram – MAIN Board (1/3) | 31 | |
Schematic Diagram – MAIN Board (2/3) | 32 | |
Schematic Diagram – MAIN Board (3/3) | 33 | |
Printed Wiring Boards – H.P/MUTING/POWER/ |
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| ROTARY/VIDEO 3(DE945)/VOL/ |
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| V. SWITCH (E) Boards | 34 |
Schematic Diagram – H.P/MUTING/POWER/ |
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| ROTARY/VIDEO 3(DE945)/VOL/ |
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| V. SWITCH (E) Boards | 35 |
Printed Wiring Boards – BIAS (C)/BIAS (L) |
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| /BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards | 36 |
Schematic Diagram – BIAS (C)/BIAS (L) |
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| /BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards | 37 |
Printed Wiring Boards | 38 | |
Schematic Diagram | 39 | |
Printed Wiring Boards | 40 | |
Schematic Diagram – AC/SP Boards | 41 | |
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5. | EXPLODED VIEWS | 56 |
6. | ELECTRICAL PARTS LIST | 59 |
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