Emerson EWC1902 Service Manual Page 9
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1-2-4 SFTY_2
Safety Check after Servicing
Examine the area surrounding the repaired location
for damage or deterioration. Observe that screws,
parts and wires have been returned to original posi-
tions. Afterwards, perform the following tests and con-
firm the specified values in order to verify compliance
with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between sol-
dered terminals, and between terminals and surround-
ing metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current be-
tween B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals,
antenna terminals, video and audio input and output
terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)
Insert load Z between B (earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of
load Z. See Fig. 2 and following table.
Table 2 : Leakage current ratings for selected areas
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
AC Line Voltage Region
Clearance
Distance (d) (d')
110 to 130 V
USA or
CANADA
≥ 3.2 mm
(0.126 inches)
Chassis or Secondary Conductor
dd’
Primary Circuit Terminals
Fig. 1
Fig. 2
AC Voltmeter
(High Impedance)
Exposed Accessible Part
B
One side of
Power Cord Plug Prongs
Z
AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:
110 to 130 V
USA or
CANADA
0.15µF CAP. & 1.5kΩ
RES. connected in
parallel
i≤0.5mA rms
Exposed accessible
parts
- 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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