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PVM-1 440QM/1 442QM/1
444QM
SECTION
4
SAFETY RELATED ADJUSTMENTS
CONFIRMATION
WHEN
REPLACING
H.V.R
(High
Voltage
Resistor)
The
following
adjustment should
be confirm
the
output
voltage
when
replacing
HVR.
1.
Receive an
entire
white
signal.
2.
•
CONTRAST
Maximum
•
BRIGHTNESS
Maximum
3.
Connect
a digital
multimeter
to the
A-20
connector
side lead of
R804.
4.
Confirm
the voltage
is
14.1
±1.0
V
DC.
$KR500.
CONFIRMATION
METHOD (HOLDDOWN
CONFIRMATION)
AND READJUSTMENTS
The
following
adjustments should always
be
performed
when
replacing the following
components.
IC501
,
Q503, Q504, Q505, Q506,
D509, D51
0.
C505, C520, C524,
C525, C526. C527, C528, C529,
C530,
C531
,
R500, R506, R516,
•
on
A
board
R51
7,
R51
8,
R519, R520. R521,
R522, R523, R524. R525, R526,
R528, R804,
NL501,
HVR
1.
Receive an
entire
white
signal.
2.
•
CONTRAST
Maximum
•
BRIGHTNESS
Maximum
3.
Connect
a digital
multimeter
to the
A-20
connector
side lead
of
R804.
4.
Confirm
the voltage
is
14.1
±1.0
V
DC.
5.
Receive
a
dot
signal.
6.
Disconnect
A-22
connector
(ABL
JIG)
on
A
board
and connect an ammeter.
7.
Adjust
BRIGHTNESS
and
CONTRAST
so
that
the
current
is
70
±30
u
A.
8.
Apply
an
external
DC
voltage gradually to the A-
2Q
connector
side
lead
of
R804,
and
when
the
voltage
becomes
16.4
±0.1
V
DC, confirm
the
HOLD-DOWN
circuit
operates
immediately
and
raster
disappears.
9.
With
the
same
procedure
of
item
8,
when
the
voltage
becomes
15.8
±0.1
V
DC, confirm
the
HOLD-DOWN
circuit
doesn't
operate.
10.
Receive an
entire
white
signal.
11.
Adjust with
BRIGHTNESS
and
CONTRAST
volumes
so
that
the current
is
600
±40
u
A.
12.
Apply
DC
voltage
to
the
A-20
connector
side lead
of
R804, and
when
the voltage
becomes
15.8 ±0.1
V
DC, confirm
the
HOLD-DOWN
circuit
operates
immediately
and
raster
disappears.
13.
With
the
same
procedure
of
item
8,
when
the
voltage
becomes
15.2
±0.1
V
DC, confirm
the
HOLD-DOWN
circuit
doesn't
operate.
14.
When
step
4
to
1
3
is
not
satisfied,
readjustment
should
be
performed by
altering
the resistance
value
of
R500
0§9.
i
-
16
-
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