2.2.3 Main Power Supply Regulation with fluctuation of the line
a) Repeat the procedure of the item 2.2 when the television is connected to the electric net
with 100VAC/60Hz and also 240VAC/60Hz.
Condition Test Point Minimum Nominal Maximum Unit
“PP” 240V
AC
+B 103V (Cathode of D807) 102.00 103.00 104.00 V
DC
“PP” 240V
AC
+B 16V (Cathode of D808) 14.00 15.50 16.50 V
DC
Condition Test Point Minimum Nominal Maximum Unit
“PP” 100V
AC
+B 103V (Cathode of D807) 102.00 103.00 104.00 V
DC
“PP” 100V
AC
+B 16V (Cathode of D808) 14.00 15.50 16.50 V
DC
2.4 Auxiliary power supply from Fly Back Transformer.
a) Connect the TV under test to a 117 Vac/60 Hz line.
b) Turn On the TV set and apply a 60dBµV RF signal modulated by a white pattern video
signal and a 4.5 MHz +- 25 kHz deviation FM signal modulated by a 1kHz audio signal
(Frequency and channel factory defined).
c) Adjust the TV to a “PP” condition.
d) Utilizing a electronic DC voltmeter (over 10 M input impedance), read the auxiliary power
supply from Fly-Back transformer :
e) Read the RMS voltage apply to the CRT heat., Utilizing a true RMS voltmeter.
f) When exist, read the auxiliary wind Peak to peak voltage, utilizing an oscilloscope.
Condition Test Point Minimum Nominal Maximum Unit
“PP” 117V
AC
E+12V (Cathode do D402) +11.00 +12.00 +13.00 V
DC
“PP” 117V
AC
E-12V (Anode do D403) -11.00 -12.00 -13.00 V
DC
“PP” 117V
AC
E180V (Anode do D404) 165.00 175.00 185.00 V
DC
“PP” 117V
AC
Heater (RMS) (Pins 5 and 4 of
V901)
5.70 6.30 6.90 V
RMS
To Next Page
Loading...
