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Safety Related Adjustment; B Voltage Check; Protection Circuit Confirmation; Hold-down Circuit Connection Confirmation - Sony PVM-9L1 Service Manual

Trinitron color video monitor.
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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
. VG (programmable video signal generator)
VG-854 or equivalent
. DC power supply
. Digital VOM
Advantest TR6845 or equivalent
. Slide induction transformer
n
Start the following adjustments after 5 minutes have
passed after the main power is turned on.

3-1. +B Voltage Check

When the parts shown below are replaced, confirm the
matters described below.
A board
IC601, IC651, R624, R651, R653, T601, PH601
1. Supply the power source voltage of 127 to 130 V
the set and turn ON the power.
2. Input the 480/60I all black signal, and adjust the
BRIGHT and CONTRAST knobs on the front panel to
MIN.
3. Check that the +B voltage is 38.5 to 41.5 V
+B voltage measurement point
Between CN1501 pin-1 on A board and GND.
PVM-9L1
Section 3

Safety Related Adjustment

3-2. Protection Circuit Confirmation

When the parts (with a
shown below are replaced, confirm the matters described
below.
A board (HV Protector Circuit)
A board (IK Protector Circuit)
3-2-1. Hold-down Circuit Connection
1. Supply the power source voltage of 117 to 120 V
2. Input the 480/60I all black signal, and adjust the
3. Check that the voltage between C314 +side and GND
to
AC

3-2-2. HV Protector Circuit Confirmation

.
DC
1. Supply AC power voltage of 127 to 130 V
2. Input the 480/60I all black signal, and adjust the
3. Check that the voltage between the C314 +side and
4. Confirm that the protector circuit is not activated.
5. Apply the following voltage between the C314 +side
mark on the circuit diagram)
..... D302, D303, D561, IC301, IC302, Q302, Q303,
Q304, Q559, Q560, Q561, Q562, R316, R317,
R318, R319, R320, R321, R322, R323, R325,
R326, R327, R328, R588, R589, R590, R591,
R592, T501 (FBT)
..... D301, D561, IC302, Q301, Q559, Q560, Q561,
Q562, R304, R305, R306, R307, R308, R309,
R310, R311, R312, R313, R314, R315, R588,
R589, R590, R591, R592, T501 (FBT)
Confirmation
the set and turn ON the power.
BRIGHTNESS and CONTRAST knobs on the front
panel to MIN.
satisfies the following specified value.
3.8 V
or more
DC
unit and turn the POWER ON.
BRIGHTNESS and CONTRAST knobs on the front
panel to MIN.
GND satisfies the specified value.
Specified value : 4.5 to 4.7 V
and GND on the A board, and confirm that the protec-
tor circuit is activated and raster disappears.
4.98 to 5.13 V
DC
to
AC
to the
AC
DC
3-1

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