10
High Voltage limiter circuit operation check.
1. Turn off TV and connect jig as shown in Figure 2. Adjust
jig fully counter-clockwise for minimum resistance.
2. Set the AC input to 120V AC and turn on TV.
3. Confirm test pattern on CRT is a usable picture, then
slowly adjust jig until the picture disappears and TV shuts
down.
4. When the limiter circuit is operating properly, High
Voltage will be less than 31.5 kV at 1.5mA when TV shuts
down.
5. Turn off set immediately after checking circuit operation.
6. Unplug set for one minute to reset shutdown circuit.
Remove jig and voltmeter.
TECHNICAL CAUTIONS
TP91
CP16
IP04
Remove RH80 and connect 50K
Ω
VR jig as shown.
FBT
RH80
TP91
POWER/DEFLECTION PWB
RH44
50K½VR
Chassis ground
High impedance
H.V. meter
Deflection P.W.B.
FBT
(TH01)
High voltage
connector
Fig. 2. Deflection/Power P.C.B.
Summary of Contents for 50NP4
Page 55: ...55 ...
Page 56: ...56 ...
Page 57: ...57 ...
Page 64: ...PRINTED CIRCUIT BOARD 61 2H Video Terminal P W B ...
Page 65: ...PRINTED CIRCUIT BOARD DEFLECTION P W B 62 ...
Page 66: ...PRINTED CIRCUIT BOARD SIGNAL P W B 63 ...
Page 67: ...PRINTED CIRCUIT BOARD VM SENSOR 2 64 ...
Page 68: ...PRINTED CIRCUIT BOARD POWER SUPPLY P W B 65 ...
Page 69: ...PRINTED CIRCUIT BOARD SRS P W B 66 ...
Page 70: ...67 WIRING DRESS DRAWING ...
Page 71: ...68 50NP4 WIRING DRAWING ...
Page 72: ...69 60NP4 WIRING DRAWING ...
Page 73: ...70 50NP4 WIRING DRAWING ...
Page 74: ...71 60NP4 WIRING DRAWING ...
Page 75: ...72 BLOCK DIAGRAM ...
Page 76: ...73 WIRING DRAWING ...
Page 90: ...88 ...