Technical Cautions - Hitachi DP05 Service Manual

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.
Chassis ground
High impedance
H.V. meter
TP91
TP91
POWER/DEFLECTION PWB

TECHNICAL CAUTIONS

Deflection P.W.B.
Remove RH80 and connect 50KΩVR jig as shown.
FBT
CP16
IP04
RH80
RH44
Fig. 2. Deflection/Power P.W.B.
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.
High voltage
connector
FBT
(TH01)
50K½VR
3