Technical Cautions - Hitachi 51SWX20B 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.
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 K9Y1

TECHNICAL CAUTIONS

R903
C981
R980
WHITE side
TESTER
4. When the limiter circuit is operating properly, High
Voltage will be less than 30.5 kV at 1.4mA 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.
(TH01)
X901
KP01
PA
EF901
1
2
F901
GND side
10
DP27/27D
C901
EF901