Sony PVM-9L2 Service Manual page 29

Section 3
Safety Related
Adjustment
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
CA-100
or equivalent
If the
Minolta
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.
I
Note
I
Start
the following adjustments after
5 minutes have
passed
after
the
main power
is
turned
on.
When
the parts
(with a
B
mark
on
the circuit
diagram)
shown below
are replaced,
confirm
the
matters described
in
items 3-1 and 3-2
shown
below.
D
board
(HV
protector
circuit)
a
D504, D516, D1518, D1520, IC1508, IC1509,
Q503, Q504, Q505, Q506, Q1523, Q1524, Q1525,
R522, R523, R524, R526, R1573, R1575, R1577,
R1580, R1581, R1582, R1583, R1584, R1593,
R1594, R1598, R1599,
R1620
D
board (IK
protector
circuit)
a
D504, D516, D1519,
IC1509,
Q503, Q504, Q505,
Q506, Q1522, R522, R523, R524, R526, R1574,
R1576, R1578, R1585, R1586, R1587, R1588,
R1589, R1590, R1591, R1592,
R1620
3-1
.
HhB
Voltage
Check
1.
Supply the
power source voltage of
130
Vac
to the set
and
turn
ON
the
power.
2.
Connect
the
480/601
all
black
signal to the
input
and
adjust the
BRIGHT
and
CONTRAST
of the
User
Control of
the
main
menu
to
MIN.
3.
Check
that the
+B
voltage
is
38.5 to
41
.5
V.
-HB voltage
measurement
point
Between C549
positive terminal
on
D
board and
GND
3-2.
Hold-down
Circuit
Connection
Check
1.
Supply
the
power
source voltage
of
120
Vac
to the set
and
turn
ON
the
power.
2.
Connect
the 480/601
all
black
signal to the input
and
adjust the
BRIGHT
and
CONTRAST
of the
User
Control of
the
mcim
menu
to
MIN.
3
.
Check
that the voltage
between
C
1
573 positive
terminal
on
D
board and
GND
is
3.80
V
or more.
PVM-9I_2
3-1