Hitachi 57F59A Service Manual page 13

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.
Remove RH19 and connect 50KΩ VR jig as shown.
RH19
TH02
FBT
RH17
Fig. 2. Power/Deflection P.W.B
TABLE OF CONTENTS
TECHNICAL CAUTIONS
50KΩ VR
33KΩ
33KΩ
50KΩ VR
Resistor
12 12
4. When the limiter circuit is operating properly, High
Voltage will be less than 37 kV at 1.62mA 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.
(TH02)
AC CORD POLARITY
This check is based on the UL standard. Use the jigs
specified by the production technology section. The
GND side (wider blade) of the AC power cord should
be connected to KKC2
DP65
L901
C901
PA
2
1
WHITE side
WHITE side = GND side
Tester