Safety Related Adjustment; +B Voltage Check; G Board (Hv Protector Circuit) - Sony TRINITRON PVM-14L2 Service Manual

This section explains the adjustment procedure when
safety related component(s) is replaced. Perform the
following adjustment when the safety related component(s)
is replaced.
[Preparation]
Equipment Required
. Oscilloscope
Tektronix 2465 or equivalent (with bandwidth of 350
MHz)
. NTSC/PAL component signal generator
Tektronix TG2000 +AVG1 (option module) +AWVG1
(option module) or equivalent
. Monoscope signal generator
ShibaSoku TP22AX or equivalent
. VG (programmable video signal generator)
VG854 or equivalent
. DC power supply
. Digital VOM
Advantest TR6845 or equivalent
. Slide induction transformer
. Electrostatic Voltmeter
. High tension voltmeter
. Ammeter
. Luminance meter
Minolta CRT Color Analyzer CA-100 or equivalent.
If the Minolta CRT Color Analyzer CA-100 is not
available, perform the measurement by visual inspection
by comparing the monitor that has already been adjusted
earlier with the monitor that you want to adjust.
n
Start the following adjustments after 5 minutes have
passed after the main power is turned on.
PVM-14L2/20L2
Section 3

Safety Related Adjustment

When the parts (with a
shown below are replaced, confirm the matters described
in items 3-1 and 3-2 shown below.

G board (HV protector circuit)

3-1. +B Voltage Check

1. Supply the power source voltage of 127 to 130 V
2. Input the 480/60I all black signal, and adjust the
3. Check that the +B voltage is 115.8 to 117.4 V
mark on the circuit diagram)
..... C546, D501, D516, D625, IC502, IC503, IC602,
PH602, Q607, Q609, Q610, Q613, R509, R510,
R511, R514, R515, R516, R565, R638, R640,
R653, R654, R663, T502 (FBT)
the set and turn ON the power.
BRIGHT and CONTRAST knobs on the front panel to
MIN.
+B voltage measurement point
For 14-inch receiver :
Between T502 FBT pin-4 on G board and GND.
For 20-inch receiver :
Between T502 FBT pin-2 on G board and GND.
to
AC
.
DC
3-1