Sony TRINITRON PVM-8020 User manual

SERVICE MANUAL
March, 1985
SPECIFICATIONS
NTSC system’
Microblack Trinitron tube
8-inch picture measured diagonally,
70-degree deflection
Resolution 230 TV lines (B/W)
Color temperature 9300° K
Frequency response
Color system Inputs
Picture tube
4 MHz (-3 dB)
Horizontal linearity
+8% Outputs
Vertical linearity +8%
Line pull range Horizontal + 500 Hz
Vertical 8 Hz
Overscan of the picture
6%
Underscan of the picture
5%
H/V delay Horizontal: Approx. 1/4 line
Vertical: Approx. 1/2 line
Return loss 5 MHz, —30 dB (INPUT A, INPUT B)
Zooming Within 3 %
Convergence Central area 0.5 mm
Periphery 0.7 mm-
Brightness More than 50 foot-lamberts
MICROFILM
US Model
Chassis No. SCC-629A-A
A
VIDEO IN (INPUT A): BNC
connector
VIDEO (INPUT B): BNC connector.
Composite 1V p-p + 6 dB,
75 ohms, unbalanced, sync
negative
AUDIO IN (INPUT A): minijack
AUDIO (INPUT B): minijack
~—5 dBs, 47 k ohms or more
VIDEO OUT (INPUT A): BNC
connector
VIDEO (INPUT B): BNC connector
1 V p-p, 75 ohms, unbalanced,
sync negative
AUDIO OUT (INPUT A): minijack
AUDIO (INPUT B): minijack
Output level 0.8 W
TUNER connector 6-pin DIN connector
Pin No. 1: not in use
Pin No. 2: video input, composite
1 V p-p + 6 dB, 75 ohms,
unbalanced, sync negative
Pin No. 3: ground
Pin No. 4: audio input, —5 dBs,
47 k ohms or more
Pin No. 5: power output
Pin No. 6: not in use
TRINITRON®
COLOR VIDEO MONITOR
SONY.

PVM-8020
VF-501
Power requirements .
120 V ac, 50/60 Hz
12 V de, with the optional Sony
NP-1 battery pack or 12 V car bat-
tery using the optional DCC-16AW
car battery cord
Power consumption
47 W ac, max.
38 W dc, max.
Dimensions
(115/s inches)
232mm (94/4 inches)
293mm
(17/4 inches) ~ (942 inches)
Weight Approx. 7.2 kg (15 Ib 14 oz)
not incl. accessories
Accessories supplied
AC power cord (1)
Hood (1)
Design and specifications subject to change without
notice.
OPTIONAL ACCESSORIES
- TV tuner unit TU-1110
Battery pack NP-1
Car battery cord DCC-16AW
POTS

PVM-8020
VE-501
Section
Title
Page
Section
Title
Page
1.
GENERAL
5.
DIAGRAMS
j-1.
Features
ec
eds
cis.
jee
helaa
dhs
LS
Se
faved
5
5-1.
Circuit
Boards
Location
..................
30
1-2.
Precautions
.........00
0.
ce
cece
ee
ence
eee
5
5-2.
Block
Diagram
.............200¢s-
ceacte’
31
1-3,
Location
and
Function
of
Controls
.......
6
5-3.
Schematic
Diagrams
.................00-5
35
1-4.
Power
SOUICES
......
6.
cee
eee
eee
eee
10
5-4,
Semiconductors
........
0.00
e
eee
ee
eee
eee
42
1-5.
System
Connections
...........+-.-..005-
11
5-5.
Printed
Wiring
Boards
...............-+4.
43.
1-6,
Use
of
the
Stand
.............
2c
eee
eee
12
6.
EXPLODED
VIEWS
1-7.
Attaching
the
Supplied
Hood.............
12
6-1.
Bezel,
Cabinet
Ass’y
..........0-..00e
eee
50
2.
DISASSEMBLY
6-2.
Cabinet
Bottom
ASs’y
...........0.ce
cence
51
2-1.
Cabinet
Removal
.............
00.
ee
eens
13
6-3.
ChassisvASS
yoo
ate
ta
sied
Saat
eee
oe
52
2-2.
Bezel
Removal
(HA,
HB,
X
Board)
.......
13
7.
ELECTRICAL
PARTS
LIST
................0408
53
2-3.
Cabinet
Bottom
Removal.................
14
2-4.
DA
Board
Removal
.............e0
eee
eee
15
2-5.
BA,
BB
Board
Removal
............-.0045
15
2-6.
CRT
Removal
............
2
cece
eee
ees
16
3.
SET-UP
ADJUSTMENT
3-1.
Beam
Landing............
02.
e
eee
eee
17
3-2.
Focus
Adjustment............6
cece
ee
eee
17
3-3,
CONVETZENCE
00...
cece
eet
eee
ences
18
3-4,
White
Balance
.........6..
ee
ce
sence
eee
e
ee
19
4.
CIRCUIT
ADJUSTMENT
41.
BA
Board
Adjustments
..............-0065
20
4-2.
Safety
Related
Adjustments...............
23
4-3.
DA
Board
Adjustments
............--.05-
24
44.
BB
Board
Adjustments
.................5.
27
4-5,
HA
Board
Adjustments
............--+++5
28
WARNING
!!
AN ISOLATION TRANSFORMER SHOULD BE USED
DURING ANY SERVICE TO AVOID POSSIBLE SHOCK
HAZARD, BECAUSE OF LIVE CHASSIS. ;
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CON-
NECTED TO THE AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARK
ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL TO
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR !N SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS
THAT ARE CRITICAL TO SAFE OPERATION ARE
IDENTIFIED IN THIS MANUAL. FOLLOW THESE PRO-
CEDURES WHENEVER CRITICAL COMPONENTS ARE
REPLACED OR IMPROPER OPERATION IS SUSPECTED.

*VM-8020
F-501
SAFETY CHECK-OUT
After correcting the original service problem,
perform the following safety checks before releasing
the set to the customer:
1. Check the area of your repair for unsoldered or
poorly-soldered connections. Check the entire
board surface for solder splashes and bridges.
2. Check the interboard wiring to ensure that no
wires are ‘“‘pinched” or contact high-wattage
resistors.
3. Check that all control knobs, shields, covers,
ground straps, and mounting hardware have
been replaced. Be absolutely certain that you
have replaced all the insulators.
4. Look for unauthorized replacement parts, par-
ticularly transistors, that were installed during a
previous repair. Point them out to the customer
and recommend their replacement.
5. Look for parts which, though functioning, show
obvious signs of deterioration. Point them out
to the customer and recommend their replace-
ment.
6. Check the line cord for cracks and abrasion.
Recommend the replacement of any such line
cord to the customer.
7. Check the condition of the monopole antenna
(if any).
Make sure the end is not broken off, and has
the plastic cap on it. Point out the danger of
impalement on a broken antenna to the
customer, and recommend the antenna’s
replacement.
8. Check the B+ and HV to see they are at the
values specified. Make sure your instruments
are accurate; be suspicious of your HV meter
if sets always have low HV.
9. Check the antenna terminals, metal trim,
“metallized” knobs, screws, and all other
exposed metal parts for AC leakage. Check
leakage as described below.
To Exposed Metal
Parts on Set
AC
voltmeter
| | {0.75 V)
0.15 uF
= Earth Ground
Using an AC voltmeter to check AC leakage.
—4—
LEAKAGE TEST
The AC leakage from any exposed metal part to
earth ground and from all exposed metal parts to any
exposed metal part having a return to chassis, must
not exceed 0.5mA (500 microampers). Leakage
current can be measured by any one of three
methods.
1. A commercial leakage tester, such as the
Simpson 229 or RCA WT-540A. Follow the
manufacturers’ instructions to use these instru+
ments.
2. <A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this job.
3. Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meter. The “limit” indication is 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63Trd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)
HOW TO FIND A GOOD EARTH GROUND
A cold-water pipe is guaranteed earth ground; the
cover-plate retaining screw on most AC outlet boxes is
also at earth ground. If the retaining screw is to be
used as your earth-ground, verify that it is at ground
by measuring the resistance between it and a cold-
water pipe with an ohmmeter. The reading should be
zero ohms. If a cold-water pipe is not accessible,
connect a 60—100 watts trouble light (not a neon
lamp) between the hot side of the receptacle and the
retaining screw. Try both slots, if necessary, to locate
the hot side of the line, the lamp should light at
normal brilliance if the screw is at ground potential.
(See Fig. B)
Trouble Light
- Ohmmeter
= AC Outlet Box
N
Cold-water Pipe
Fig. B. Checking for earth ground.

PVM-8020
VF-501
SECTION 1
GENERAL
1-1.
FEATURES
Microblack™
Trinitron®
picture
tube
The
Microblack
Trinitron
picture
tube
gives
a
high
resolution,
high
contrast
picture.
Push-to-lock controls
In the locked position, the controls are protected from
damage during carriage of the unit. The protruding posi-
tion allows easier operation.
Monitor of sync signals
The HV-DELAY switch allows horizontal and vertical
sync signals to be displayed on the screen.
Blue only picture
By using the B-ONLY switch, the picture can be
displayed in blue and black only, facilitating hue adjust-
ment or observation of VTR noise.
Underscan mode
The signal normally scanned outside of the screen can
be monitored in the underscan mode.
6-pin DIN tuner connector
The TUNER connector allows easy connection of a TV
tuner, which is equipped with the 6-pin DIN connector,
using a single cable.
Three
power
sources
The
monitor
can
operate
on
either
house
current,
a
rechargeable
battery
or
a
12
V
car
battery,
allowing
use
indoors
or
outdoors.
The
battery
charge
function
is
incorporated.
1-2. PRECAUTIONS
On safety
@ Operate the unit only on 120 V ac or 12 V dc.
For ac operation, use only the supplied ac power cord.
Do not use any other type.
For battery operation, use only the optional NP-1 battery
pack. Do not use any other batteries.
For car battery operation, use only the optional
DGC-16AW car battery cord. Do not use any other car
battery cord.
@ Should any liquid or solid object fall into the cabinet,
unplug the unit and have it checked by qualified person-
nel before operating it any further.
@ Unplug the unit from the wall outlet if it is not to be
used for several days.
@To disconnect the ac power cord, pull it out by the
plug. Never pull the cord itself.
On installation :
@ Allow adequate air circulation to prevent internal heat
build-up.
Do not place the Unit on surfaces (rugs, blankets, etc.) or
near materials (curtains, draperies) that may block the
ventilation holes.
@ Do not install the unit in a location near heat sources
such as radiators or air ducts, or in a place subject to
direct sunlight, excessive dust, mechanical vibration or
shock.
On cleaning
To keep the unit looking brand-new, periodically clean it
with a soft cloth. Stubborn stains may be removed with
a cloth lightly dampened with a mild detergent solution.
Never use strong solvents such as thinner or benzine, or
abrasive cleansers since these will damage the cabinet.
As a safety precaution, unplug the unit before cleaning
it.
On repacking
Do not throw away the carton and packing materials.
They make an ideal container in which to transport the
unit. When shipping the unit to another location, repack
it as illustrated on the carton.
If you have any questions about this unit, contact your
authorized Sony dealer.

2»VM-8020
'F-501
1-3.
LOCATION
AND
FUNCTION
OF
CONTROLS
FRONT PANEL
oe Carrying handle
CHARGE indicator ®
INPUT select switch @
B-ONLY switch @ POWER switch
HV-DELAY switch BATT indicator
V HOLD control VOL control
SHARP control PICTURE control
HUE control BRIGHT control
COLOR control

@ Carrying handle
@ POWER switch
To
turn
the
monitor
on,
depress
the
POWER
switch
(ON).
To
turn
it
off,
press
the
switch
again
(OFF).
© BATT (power/battery) indicator
This
indicator
lights
when
the
power
is
turned
on.
When
the
rechargeable
battery
becomes
weak,
the
indicator
flashes
for
about
five
minutes.
Then
it
goes
out,
and
the
power is automatically turned off.
©
VOL
(volume)
control
.
Turn
this
control
clockwise
or
counterclockwise
to
ob-
tain
the
desired
volume.
@ PICTURE control
Adjusts
the
contrast,
intensity
and
brightness
simul-
taneously in the proper ratio.
@ BRIGHT (brightness) control
Adjusts
the
brightness.
Normally
set
this
control
at
the
center detent position.
@ COLOR control
Adjusts
the
color
intensity
of
the
picture.
Clockwise
rotation
makes
the
picture
more
vivid;
counterclockwise.
rotation makes it paler.
© HUE control
Use
to
obtain
the
most
natura!
skin
tones.
Clockwise
rotation
makes
the
skin
tones
more
greenish;
counterclockwise
rotation
makes
them
more
purplish.
© SHARP (sharpness) control
Adjusts
the
sharpness
of
the
picture.
Clockwise
rota-
tion
makes
the
picture
sharper;
counterclockwise
rota-
tion
makes
it
softer.
@ V HOLD (vertical hold) control
If
the
picture
rolls
vertically,
correct
it
with
this
control.
Before
turning
one
of
the
controls
@
to
@,
for
easier
operation
press
on
it
to
release
the
control
to
a
pro-
truding
position.
@ HV-DELAY switch
Normally
keep
this.
switch
released
(NORM).
To
monitor
the
sync
signals,
depress
the
switch
(oH/V).
The
picture
is
shifted
horizontally
and
vertically.
The
horizontal
sync
is
displayed
in
left
approximately
one
quarter
of
the
screen
and
the
vertical
sync
is
displayed
near
the
center
of
the
screen.
® B-ONLY (blue only) switch
Normally
keep
this
switch
released
(GNORM).
Depress
the
switch
(2
BLUE)
to
turn
off
the
red
and
green
beams.
The
picture
will
be
displayed
in
blue
and
black
only.
This
facilitates
hue
adjustment
or
observation
of
VTR
noise.
PVM-8020
VF-501
@® SCAN mode select switch
Keep
this
switch
released
(NORM)
for
normal.
scan-
ning.
Depress
the
switch
(aUNDER)
to
reduce
the
display
size
by
about
5%
(underscanning
mode)
and
to
view
a
picture
which
does
not
appear
in
normal
scanning.
@® INPUT select switch
Keep this switch released (1A) to monitor the signal
from
the
INPUT
A
connectors.
Depress
the
switch
(8)
to monitor the signal from the INPUT B connectors.
® CHARGE indicator
Lights
during
charging.
When
charging
is
compliers
the
indicator goes out.

»VM-8020
‘F-501
REAR PANEL
INPUT B
21) VIDEO input/output connector
INPUT A —) 750 termination switch
VIDEO
IN
connector
G
&)
AUDIO
input/output
connector
750 termination switch @ TUNER connector
VIDEO OUT connector 3 € RIGIB BKG controls
AUDIO IN connector € RIGIB DRIVE conitrols
AUDIO OUT connector @)
531) EXT BATTERY DG IN 12V jack
1) OPERATE/CHARGE select switch
AC IN socket
EJECT buttons
Battery compartments @

INPUT A
To
monitor
the
input
signals
connected
to
these
con-
nectors,
keep
the
INPUT
select
switch
released
(GA).
@® VIDEO IN connector (BNC type)
Connect
to
the
video
output
of
video
equipment,
such
as a VTR or acolor video camera.
@® 750 termination switch
When
only
the
VIDEO
IN
connector
is
used
(the
VIDEO
OUT
connector
is
not
used),
set
this
switch
to
ON.
When
both
the
VIDEO
IN
and
VIDEO
OUT
connectors
are
used
together
for
a
loop-through
connection,
set
the
switch
to
OFF.
@® VIDEO OUT connector (BNC type)
Loop-through
output
of
the
VIDEO
IN
connector.
Con-
nect
to
the
video
input
of
a
VTR
or
another
monitor.
@® AUDIO IN connector (minijack)
Connect to the audio output of a VTR or to a micro-
phone (through a suitable: microphone amplifier).
@ AUDIO OUT connector (minijack)
Loop-through
output
of
the
AUDIO
IN
connector.
Con-
nect to the audio input of a VTR or another monitor.
INPUT B
To
monitor
the
input
signals
to
these
connectors,
depress the INPUT select switch (=B).
@ VIDEO input/output connector (BNC type)
Connect to the video output of a VTR or a color video
camera.
When a TV tuner is connected to the TUNER connector
and the 75Q termination switch @ is set to OFF, this
connector can-be used as a loop-through output of the
TUNER connector. Connect to the video input of a VTR
or
another
monitor.
:
@ 750 termination switch
Normally set this switch to ON. When both the TUNER
and VIDEO connectors are used together for a loop-
through connection, set the switch to OFF.
@ AUDIO input/output connector (minijack)
Connect to the audio output of a VTR or to a micro-
phone (through a suitable microphone amplifier).
When a TV tuner is connected to the TUNER connector
and the 752 termination switch @ is set to OFF, this
connector-can be used.as a loop-through output of the
TUNER connector. Connect to the audio input of a VTR
or another monitor.
@ TUNER connector (6-pin DIN)
Connect to the 6-pin DIN connector of a TV tuner. The
video and audio signals are supplied to the monitor and
the power from the monitor is fed to the tuner using a
single cable.
PVM-8020
VF-501
Note
The TUNER input and the VIDEO/AUDIO inputs @, ®
cannot be used simultaneously. When connecting a TV
tuner to the monitor, be sure to disconnect any input.
source equipment from the VIDEO and AUDIO connec-
tors, or vice versa.
@® R/G/B BKG (background) controls
Used for adjusting the white balance of the background.
@ RIG/B DRIVE controls
Used for adjusting the white balance at the white peak.
@ AC IN socket
Connect the supplied ac power cord.
@ Battery compartments
Insert the NP-1 battery pack.
@ EJECT buttons
Press the EJECT button upwards to remove the battery
pack. —
@ OPERATE/CHARGE select switch
Normally set this switch to OPERATE. To charge the
battery pack, set to CHARGE. The CHARGE indicator on
the front panel lights. When charging is complete, the
CHARGE indicator goes out; reset the switch to
OPERATE.
@ EXT BATTERY (external battery) DC IN 12 V jack
Connect the optional DCC-16AW car battery cord.

2VM-8020
1-4.
POWER
SOURCES
HOUSE CURRENT
Connect
the
supplied
ac
power
cord
to
the
AC
IN
socket
and
to
a
wail
outlet
(120
V
ac).
to a wall outlet
When
the
ac
power
cord
is
plugged
into
the
AC
IN
socket,
the
battery
pack
(if
installed)
or
the
car
battery
(if
connected)
is
automatically
disconnected.
RECHARGEABLE
BATTERY
Insert
the
Sony
NP-1
battery
pack
(optional)
into
the
bat-
tery
compartment
as_
illustrated.
The
monitor
can
operate
with
one
or
two
battery
packs.
For
extended
use,
two
battery
packs
are
recommended.
EJECT
buttons
SONY mark
OPERATE/CHARGE switch
downwards
To
remove
the
battery
pack,
press
the
EJECT
button
upwards.
Note
:
Make
sure
that
the
ac
power
cord
and
the
car
battery
cord
are
disconnected
from
the
monitor.
Otherwise,
the
monitor
cannot
operate
on
the
battery
pack(s).
Caution
Do
not
use
any
other
batteries
than
the
NP-1,
even
if
any
can
be
inserted
into
the
compartment.
Charging
the
battery
pack
Before
using
the
monitor,
be
sure
to
fully
charge
the
bat-
tery
pack.
The
charging
time
is
about
6
hours
at
normal
temperatures.
1 Connect the supplied ac power cord to the AC IN
socket and then to a wall outlet.
2 Insert the battery pack(s) into the battery com-
partment(s).
3 Set the OPERATE/CHARGE switch to CHARGE.
4 Depress the POWER switch. The CHARGE indicator
lights and charging begins.
When charging is complete, the CHARGE indicator
goes
out.
Be
sure
to
reset
the
OPERATE/CHARGE
switch to OPERATE.
When the OPERATE/CHARGE switch is set to CHARGE,
the picture cannot be monitored.
@For quicker charging, use the optional BC-1WA bat-
tery charger for NP-1.
Battery life
At
normal
temperatures,
the
picture
can
be
monitored
continuously
for
about
60
minutes
using
two
battery
packs
and
operating
the
TV
tuner
connected
to
the
monitor.
When
the
TV
tuner
is
not
used,
longer
battery
life
can
be
expected
(about
75 to
80
minutes).
When the battery is exhausted, the green BATT in-
dicator flashes for about five minutes, and then the
power is turned off automatically to prevent excessive
battery discharge. When the BATT indicator goes off,
press the POWER switch and replace the. exhausted °
battery pack(s) with fully charged one(s), or use another
power source.
CAR BATTERY
Use
the
Sony
DCC-16AW
car
battery
cord
(optional)
fora
42
V
car
battery.
Connect
the
car
battery
cord
to
the
EXT
BATTERY
DC
IN
12
V
jack
and
to
the
cigarette
lighter
socket
of
a
car.
For
further
details,
read
the
instruction
manual
of
the
car
battery
cord.
to a cigarette
lighter socket
to EXT BATTERY
DC IN 12 V
When the car battery cord is plugged into the EXT BAT-
TERY DC IN 12 V jack, the battery pack (if installed) is
disconnected automatically.
Note
Use only the recommended car battery. cord manufac-
tured by Sony. Polarity of the plugs of other manufac-
turers may be different.
Polarity of the plug of Sony
car battery cord :
—10—