1 Safety Precautions
1.1.
General Guidelines
1. W hen servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
3. A fter servicing, make the following leakage current checks to prevent the custom er from being exposed to shock hazards.
4. W hen servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
5. A fter servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
A fter servicing, make the following leakage current checks to prevent the custom er from being exposed to shock hazards.
6
1.2.
Touch-Current Check
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transform er for this check.
2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground
such as a w ater pipe, as shown in Figure 1.
3. Use Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.
4. Check each exposed metallic part, and measure the voltage at each point.
5. Reserve the AC plug in the AC outlet and repeat each of the above measure.
6. The potential at any point (TOUGH CURRENT) expressed as voltage U
1
and U
2
, does not exceed the following values:
For a. c.: U
1
= 35 V (peak) and U
2
= 0.35 V (peak);
For d. c.: U1 = 1.0 V,
Note:
The limit value of U
2
= 0.35 V (peak) for a. c. and U
1
= 1.0 V for d. c. correspond to the values 0.7 mA (peak) a. c. and 2.0
mA d. c.
The limit value U
1
= 35 V (peak) for a. c. correspond to the value 70 mA (peak) a. c. for frequencies greater than 100 kHz.
7. In case a m easurement is out of the limits specified, there is a possibility of a shock
hazard, and the equipm ent should be
repaired and rechecked before it is returned to the customer.
Measuring network for TOUCH CURRENTS
COLD
WATER PIPE
(EARTH GROUND)
Rs=
1500Q
_ L Cs=
0.22|
j
F
10kQ
-1
k
1
---------
1
Ro=
----------------
J
5 0 0 Q
'
U
1
=
r
= 0 . 0 2 2 |
j
F
( V )
J Q
L jJ J U U i i
U 1 — |— и . и ^ г ф Г
^ V
J
| U
2
(V)
APPLIANCES
EXPOSED
METAL PARTS
Resistance values in ohms (Q)
V:
Voltmeter or oscilloscope
(r.m.s. or peak reading)
Input resistance:
> 1 MQ
Input capacitance: < 200 pF
Frequency range: 15 Hz to 1 MHz and d.c. respectively
NOTE - Appropriate measures should be taken to obtain the correct value in case of non-sinusoidal waveforms.
Figure 1
2
Summary of Contents for TX-PR37X10
Page 15: ...6 4 No Picture No Picture Check NG 15 ...
Page 25: ...8 1 4 Adjustment Volume Location 8 1 5 VR16600 Vad Test Point Location 25 ...
Page 30: ...30 ...
Page 31: ...9 Block Diagram 9 1 Main Block Diagram 31 ...
Page 32: ...9 2 Block 1 3 Diagram JK8302 SPEAKER L SPEAKER R SD CARD SLOT 32 ...
Page 33: ...9 3 Block 2 3 Diagram 33 ...
Page 34: ...9 4 Block 3 3 Diagram S S S U S TA IN D RIVE P O W E R S U P P LY s c SC A N D R IVE 34 ...
Page 36: ...10 3 Wiring 2 36 ...
Page 38: ...38 ...
Page 41: ...11 2 P Board 1 4 Schematic Diagram 40 0 ...
Page 43: ...11 4 P Board 3 4 Schematic Diagram A B C D E A P BOARD LSEP1279BEHB 3 4 F 1 2 3 4 42 ...
Page 44: ... 11 5 P Board 4 4 Schematic Diagram 10 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 43 ...
Page 45: ...11 6 GK К and S Board Schematic Diagram A С F 1 2 3 4 ...
Page 46: ...S BOARD TXN S1 EQUE ...
Page 47: ...11 7 A Board 1 21 Schematic Diagram A A B O A R D 1 21 IIC REF No 0900 0999 B F 45 ...
Page 51: ...11 11 A Board 5 21 Schematic Diagram 37 38 39 40 ...
Page 52: ...А A BOARD 5 21 ADV_V REF No 4500 4799 41 42 43 44 45 49 ...
Page 53: ...11 12 A Board 6 21 Schematic Diagram TO 6 71 46 47 48 49 50 50 ...
Page 54: ...А A BOARD 6 21 ADV_A REF No 2000 2499 51 52 53 54 ...
Page 55: ...11 13 A Board 7 21 Schematic Diagram 55 56 57 58 59 60 61 62 63 51 ...
Page 60: ...11 18 A Board 12 21 Schematic Diagram 100 101 102 103 104 105 106 107 108 56 ...
Page 67: ...11 25 A Board 19 21 Schematic Diagram A A BOARD 19 21 DTV CRNo 8300 8999 163 164 165 166 ...
Page 68: ...167 168 169 170 171 63 ...
Page 72: ...11 29 C1 Board 2 2 Schematic Diagram ...
Page 73: ...11 30 C2 Board 1 2 Schematic Diagram A C2 BOARD TNPA4891 1 2 TO A BOARD A31 C21 B 68 ...
Page 74: ...11 31 C2 Board 2 2 Schematic Diagram TO A BOARD A32 10 11 12 13 14 15 16 17 18 69 ...
Page 75: ...11 32 SC Board 1 3 Schematic Diagram в D A SC BOARD TXNSC1 ERUE 1 3 1 2 3 4 ...
Page 76: ...IC16771 C0CBADC00072 70 ...
Page 77: ...11 33 SC Board 2 3 Schematic Diagram 10 11 12 13 14 15 16 17 18 71 ...
Page 78: ...11 34 SC Board 3 3 Schematic Diagram 19 20 21 22 23 24 25 26 27 72 ...
Page 79: ...11 35 SS Board 1 2 Schematic Diagram A B C D E F 3 4 5 73 ...
Page 84: ...P BOARD COMPONENT SIDE LSEP1279BEHB 77 ...
Page 87: ...12 3 A Board A BOARD FOIL SIDE A PR37X10 6 5 4 3 2 1 A I B I C I D I E I F I G I H I I 79 ...
Page 90: ...A BOARD COMPONENT SIDE A PR37X10 81 ...
Page 93: ...12 6 SC Board SC BOARD FOIL SIDE TXNSC1ERUE 6 5 4 3 2 1 A I B I C I D I E I F I G I H I I 84 ...
Page 96: ...SC BOARD COMPONENT SIDE TXNSC1ERUE B G 6 5 4 3 2 1 E F H 86 ...
Page 99: ......
Page 101: ...13 1 2 Packing 1 90 ...
Page 102: ...91 ...
