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Sony PVM-9L2 Service Manual Page 30

Trinitron color video monitor.
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3-3.
Protection
Circuit
Confirmation
3-3-1.
HV
Protector
Circuit
Confirmation
1
.
Supply
AC
power
voltage of
1
30
i
?
Vac
to
the unit
and
turn the
POWER
ON.
2.
Input a 480/601
all-black signal
and
set
the
BRIGHT
and
CONTRAST
VRs
on
the
User
Control screen of
the
menu,
to
MEN.
3.
Check
that
the
voltage
between
C1573
positive
terminal
on
D
board and
GND
is
3.80
V
or
more.
4.
Apply
voltage
of
4.6
to 4.8
V
from
an
external
DC
power
supply
between
Cl
57
3
positive
terminal
on
the
D
board and
GND.
Confirm
that
the
hold-down
circuit
does
not
activate.
5.
Apply
voltage
of 4.99
to
5.14
V
from an
external
DC
power
supply
between C1573
positive
terminal
on
the
D
board and
GND.
Confirm
that
the
hold-down
circuit
does not
activate
and
raster
disappears.
3-3-2.
IK Protector
Circuit
Check
1.
Connect
an
ammeter
and
a
variable
resistor
10
kQ
between
CN502
pin-7
(ABL)
and
CN1501
pin-6
(OP-
6
V) on
the
D
board.
2.
Adjust
the variable resistor
so
that the
value of
the
variable
resistor
becomes
maximum
(lOkfi).
3.
Apply
the
130
Vac power
source
voltage,
and
turn
on
the
power.
4.
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
MEN.
5.
Adjust
the variable resistor
and confirm
that
the
protector
circuit
is
activated
and
raster
disappears
at
the
ammeter
value
of 1050
|JA
or lower.
Aside
3-2
PVM-9L2

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