Emerson EWC1902 Service Manual download pdf (Page 38)

1-8-16 T5300TR1

Repair method #2

Check the primary rectifying diodes (D603-D606) as

possible problems. Remove the above mentioned

parts and check them. Perform check according to the

step 1 and 2 of repair method #1 and check for defects

following parts, then if necessary replace with factory

originals.

R602 is open or not.

Q601, Q602, D607, D608 and D611 are short or not.

Repair method #3

The feedback circuit which is monitored by the output

of D613 105V may not work and this may be regarded

as a possible cause, remove IC601 (Photo Coupler),

diode (D620) and transistor (Q604) check for defects.

Repair method #4

Check control circuitly which is connecting to Pin 2

and 1 of Switching Transformer T601.

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 91 92

SERVICE MANUAL 1
IMPORTANT SAFETY NOTICE 2
MAIN SECTION 3
SPECIFICATIONS 4
<AUDIO> 5
IMPORTANT SAFETY PRECAUTIONS 6
Precautions during Servicing 8
Safety Check after Servicing 9
STANDARD NOTES FOR SERVICING 10
Tweezers 11
Soldering Iron 11
Presolder 12
Flat Pack-IC 12
Instructions for Handling 13
Semiconductors 13
PREPARATION FOR SERVICING 14
1 92 3 4 5 6 7 8 15
1011 1412 15
[1] Rear Cabinet 17
[2] Tray Chassis 17
[4] Main CBA 17
[3] Deck Unit 17
1-6-2 T7300DC 18
1-6-3 T7300DC 19
1-6-4 T7300DC 20
1-6-5 T7300DC 21
Fig. 1-1 22
Remote control unit (Bottom) 22
3. TV AGC Adjustment 23
4-1. H Adjustment 23
4-2. C-Trap Adjustment 23
4-3. Y DL Time Adjustment 24
5. V. Size Adjustment 24
6. V. Shift Adjustment 24
PATTERN GENERATOR 25
RF INPUT 25
9. Sub-Brightness Adjustment 26
10. Focus Adjustment 26
12. CCS Text Box Location 26
13.Purity Adjustment 27
14. Convergence Adjustment 27
BLOCK DIAGRAMS 29
Video Block Diagram 30
Audio Block Diagram 31
Chroma/Tuner Block Diagram 32
CRT/H.V. Block Diagram 33
HOT COLD 34
MECHANICAL TROUBLE INDICATOR 35
Countermeasure for Mechanical 36
Malfunction 36
Repair method #1 37
Repair method #2 38
Repair method #3 38
Repair method #4 38
Standard Notes 39
T7300SCM1 41
1-9-6 1-9-7 1-9-8 T7300SCM2 42
T7300SCM3 43
Main 4/4 Schematic Diagram 44
Main CBA Top View 45
Sensor CBA 45
Top View 45
(START-SENSOR) 45
Main CBA Bottom View 46
CRT CBA Top View 47
CRT CBA Bottom View 47
Z11WF1-10-1 1-10-2 48
WIRING DIAGRAM 49
SYSTEM CONTROL TIMING CHARTS 50
IC PIN FUNCTION DESCRIPTIONS 52
LEAD IDENTIFICATIONS 54
DECK MECHANISM 55
STANDARD MAINTENANCE 56
A/C Head 57
J-1-1, J-1-2 58
Cam Gear 59
LDG Belt (B) 59
Incorrect 61
Waveform 62
Erase Head 62
OF DECK MECHANISM 63
[20],[23] 63
Lead with 66
Blue Stripe 66
Lead with White Stripe 67
Fig. DM11 68
Fig. DM12 68
Fig. DM14 69
Fig. DM13 69
Fig. DM15 70
Fig. DM16 70
Fig. DM17 70
Fig. DM18 70
Alignment 3 72
Cam Gear (A), Rack Assembly 72
EXPLODED VIEWS AND 73
PARTS LIST SECTION 73
EXPLODED VIEWS 74
3-1-3 T7300PEX 75
DECK EXPLODED VIEWS 76
Deck Mechanism View 2 77
Deck Mechanism View 3 78
MECHANICAL PARTS LIST 79
CRT Warning Label 80
CRT Type No 80
ELECTRICAL PARTS LIST 81
20020205 3-3-2 T7300EL 82
20020205 3-3-3 T7300EL 83
20020205 3-3-4 T7300EL 84
20020205 3-3-5 T7300EL 85
20020205 3-3-6 T7300EL 86
20020205 3-3-7 T7300EL 87
20020205 3-3-8 T7300EL 88
20020205 3-3-9 T7300EL 89
SENSOR CBA 90
DECK PARTS LIST 91
B359 CLEANER LEVER B361 91
Type ID No. ID No 91
A 0VM304413 0VM411114 91
B 0VM305090 Not used 91
Printed in Japan 92
2002-02-20 HO 92

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Emerson EWC1902 Service Manual Page 38

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