Sony Trinitron PVM-8041Q User manual

SERVICE MANUAL us Model
Canadian Model
PVM-8041Q
Chassis No. SCC-E96A-A
PVM-8044Q
Chassis No. SCC-E96C-A
SPECIFICATIONS
Vkteoslp»l V
Color system PAL, SECAM, NTSCj.sa, NTSC4.43
Resolution PVM-8044Q :450 TV lines
PVM-8041Q :250 TV lines
Aperture correction -4.0 dB -+6.0 dB (at 3.0 MHz)
Frequency response 6.0 MHz (-3.0 dB) at all inputs
Synchronization AFC time constant 1.0 msec.
Picture perf<mnanco
Normal scan
Underscan
H. linearity
V. linearity
Convergence
6% over scan of CRT effective screen
area
3% underscan of CRT effective screen
area
Less than 7.0% (typical)
Less than 7.0% (typical)
Central area: 0.43mm (typical)
Peripheral area: 0.53mm (typical)
Raster size stability H: 1.0%, V: 1.5%
High voltage regulation
3.0%
Color temperature D65
R/R-Y, G/Y, B/B-Y: BNC connector
R, G, Bchannels: 0.7 Vp-p, +6 dB
Sync on green :0.3 Vp-p, negative,
75 ohms terminated
R-Y, B-Y channels: 0.7 Vp-p, ±6 dB
Ychannel: 0.7 Vp-p, ±6dB
(Standard color bar signal of 75%
chrominance)
EXT SYNC IN: BNC connector
Composite sync 4Vp-p, ±6 dB,
negative
Loop-through outputs
Y/C OUT: 4-pin mini DIN connector
VIDEO OUT: BNC connector,
75 ohms terminated
AUDIO OUT:phono jack
EXT SYNC OUT: BNC connector,
75 ohms terminated
AUDIO OUTPUT 0.5W
Tally/remote input TALLY/REMOTE: 8-pin mini DIN
connector (See the pin assignment
on page 2.)
Omrerat
aiM CMpirta
Inputs Y/C IN: 4-pin mini DIN connector
(See the pin assignment on page 2.)
VIDEO IN: BNC connector
1Vp-p ±6dB, sync negative
AUDIO IN: phono jack, -5 dBs, less
than 47k ohms
Power consumption 45 WMax at AC operation
38 Wat DC operation
—Continued on next page —
MICROFILM
TRINITRON COLOR VIDEO MONITOR
SONY.

PVM-8041Q/8044Q
Power requirements 120V AC, 50/60 Hz
12V DC, with the Sony NP-1 A/1 B
battery pack (not supplied) or
AC-500 AC power adaptor
(not supplied)
Operating temperature range
0-35 °C
Storage temperature range
-10--t-40°C
Humidity 0-90%
Dimensions Approx. 21 7x 21 7x352.5 mm (w/h/d)
(8 Vb X8®/8 X14inches)
not incl. projecting parts and controls
Weight Approx. 7.8 kg (1 7lb 3oz)
not incl. battery packs
Accessory supplied AC power cord (1
)
Design and specifications are subject to change without
notice.
Y/C IN connector (4-pin mini OiN) TALLY/REMOTE connector (8-pin mini DIN)
PteHo. Signal
1Blue only
2H/V delay
3GND
4INT/EXT SYNC
5Tally
6Underscan/normal scan
7AJB or RGB/component
8RGB/LINE
Mi NO. -
1Y-input 1Vp-p, sync negative,
75 ohms
2CHROMA sub-carrier-
input
300 mVp-p, burst
Delay time between Y
and C: within 0±100 nseC.,
75 ohms
3GND for Y-input GND
4GND for CHROMA-
input GND
For remote control, connect the pin of the desired function to
pin 3(GND).

PVM-8041Q/8044Q
SAFETY CHECK-OUT
(US Model only)
Aftercorrecting 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, particularly transistors,
that were installed during aprevious 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 replacement.
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 abroken 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.
LEAKAGE
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having areturn
to chassis, must not exceed 0.5 mA (500 microampers). Leakage
current can be measured by any one of three methods.
1. Acommercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. Abattery-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 aVOM
or battery-operated AC voltmeter. 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 apassive
VOMthat is suitable. Nearly all battery operated digital multimeters
that have a2V AC range are suitable. (Sec Fig. A)
HOW TO FIND AGOOD EARTH GROUND
Acold-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 acoldwater pipe
with an ohmmeter. The reading should be zero ohms. If acold-water
pipe is not accessible, connect a60-100 watts trouble light (not aneon
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)
To Exposed Metal
Parts on Set
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
O.tSpFy 1.5kQ
—3—

PVM-8041Q/8044Q
TABLE OF CONTENTS
Section Title Page
1.
GENERAL
1-1. Features 5
1-2. Location and Function of Parts and Controls 6
1-3. Power Sources 9
2.
DISASSEMBLY
2-1 .Cabinet Removal 11
2-2. BBoard Removal 11
2-3. Switching Regulator Removal 12
2-4. DBoard Removal 12
2-5. PBoard Removal 13
2-6. Rear Assy Removal 13
2-7. HA and FA Boards Removal 14
2-8. Picture Tube Removal 15
3.
SET-UP ADJUSTMENTS
3-1. Beam Landing 16
3-2. Convergence 17
3-3. Focus 19
3-4. White Balance 19
Section Title Page
4.
SAFETY RELATED ADJUSTMENT
4-1 .Safety Related Adjustments 20
5.
CIRCUIT ADJUSTMENTS
5-1. DBoard Adjustments 22
5-2. BBoard Adjustments 25
5-3. SBoard Adjustments 30
6.
DIAGRAMS
6-1. Frame Schematic Diagram 31
6-2. Block Diagram (1) 34
6-3. Block Diagram (2) 37
6-4. Circuit Boards Location 42
6-5. Printed Wiring Boards and Schematic Diagrams 42
6-6. Semiconductors 78
7.
EXPLODED VIEWS
7-1 .Chassis 80
7-2. Picture Tube 81
8. ELECTRICAL PARTS LIST 82
(CAUTION)
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE
ANODE CAPTOTHE METAL CHASSIS, CRTSHIELD, OR CARBON
PAINTED ON THE CRT, AFTER REMOVING THE ANODE.
WARNING!!
AN ISOLATION TRANSFORMER SHOULD BE USED DURING
ANY SERVICETO AVOID POSSIBLE SHOCK HAZARD, BECAUSE
OF LIVE CHASSIS.
THE CHASSIS OF THIS RECEIVER IS DIRECTLY CONNECTED
TO THE AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY SHADING AND MARK AONTHE
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 IN SUPPLEMENTS
PUBLISHED BY SONY. CIRCUIT ADJUSTMENTS THAT ARE
CRITICAL TO SAFE OPERATION ARE IDENTIFIED IN THIS
MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITI-
CAL COMPONENTS ARE REPLACED OR IMPROPER OPERA-
TION IS SUSPECTED.
(ATTENTION)
APRES AVOIR DECONNECTE LE CAP DE L'ANODE,
COURTCIRCUITER L'ANODE DU TUBE CATHODIQUE ET CELUl
DE L'ANODE DU CAPAU CHASSIS METALLIQUE DE L'APPAREIL,
OU AU COUCHE DE CARBONE PEINTE SUR LE TUBE
CATHODIQUE OU AU BLINDAGE DU TUBE CATHODIQUE.
ATTENTION!!
AFIN D'EVITER TOUT RISQUE D'ELECTROCUTION PROVENANT
D'UN CHASSIS SOUS TENSION, UN TRANSFORMATEUR
D'ISOLEMENT DOIT ETRE UTILISE LORS DE TOUT DI^PANNAGE.
LE CHASSIS DE CE R^CEPTEUR EST DIRECTEMENT
RACCORDi AL'ALIMENTATION SECTEUR.
ATTENTION AUX COMPOSANTS RELATIFS ALA
S^CURIT^I!
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
MAPQUE ASUR LES SCHEMAS DE PRINCIPE, LES VUES
EXPLOSEES ET LES LISTES DE PIECES CONT D'UNE
IMPORTANCE CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTSSONY DONT LE NUMERO DE PIECE EST INDIQUE
DANS LE present MANUEL OU DANS DES SUPPLEMENTS
PUBLIES par SONY. LES REGLAGES DE CIRCUIT DONT
L'IMPORTANCE EST CRITIQUE POUR LA SECURITE DU
FONCTIONNEMENT SONT IDENTIFIES DANS LE PRESENT
MANUEL. SUIVRE CES PROCEDURES LORS DE CHAQUE
REMPLACEMENT DE COMPOSANTS CRITIQUES, OU
LORSQU'UN MAUVAIS FONCTIONNEMENT EST SUSPECTE.
_4_

PVM-8041Q/8044Q
SECTION 1
GENERAL
1-1. FEATURES
Poufcolor tytiims nnfiabto '
The monitor can display PAL, SECAM, NTSCa.seand
NTSC4.43* signals. The appropriate color system is selected
automatically.
*Asignal of NTSC4.43 is used for playing back NTSC recorded
video cassettes with avideo tape recorder/player especially
designed for use with this system.
Super Fine Pitch Trinitron picture tube
(PVM-8044Q only)
The Super Fine Pitch Trinitron picture tube provides ahigh
resolution picture. Horizontal resolution is more than 450
TV lines at the center of the picture.
blue only picture
The picture can be displayed in blue and black only. This
facilitates hue adjustment and the observation of video
noise.
Analog RGB or component (Y, R-Y and B-Y) signals from
video equipment can be input through these connectors.
The video signal, split into the chrorfiinance signal (C) and
the luminance signal (Y), can be input through this connec-
tor, eliminating the interference between the two signals,
which tends to occur in acomposite video signal, assuring
video quality.
Beam current feedback circuit
The built-in beam current feedback circuit assures stable
white balance.
Comb filter
When NTSC video signals are received, acomb filter
activates to increase the resolution, resulting in fine picture
detail without color spill or color noise.
"TfcuioinaBte^tiiirniliwItlon
The Y/C, VIDEO IN and EXT SYNC IN connectors are
terminated at 75 ohms inside, when no cable is connected
to the loop-through output connectors. When acable is
connected to an output connector, the 75-ohm termination is
automatically released.
EIA itandard 19-Inch rack mounting
By using an MB-507 mounting bracket (not supplied), the
monitor can be mounted in an EIA standard 19-inch rack.
For details on mounting, see the instruction manual of the
MB-507.
For llw CuDiioiinim In iHo UtlA
INFORMATION
This equipment has been tested and found to comply with
the limits for aClass Adigital device, pursuant to Part 15of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in acommercial environment. This
equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in aresiden-
tial area is likely to cause harmful interference in which case
the user will be required to correct the interference at his
own expense.
You are cautioned that any changes or modifications not
expressly approved in this manual could void your authority
to operate this equipment.
For lh« Customers in Canada
This apparatus complies with the Class Alimits for radio
noise emissions set out in Radio Interference Regulations.
—5—

PVM-8041Q/8044Q
1-2. LOCATION AND FUNCTION OF PARTS AND CONTROLS
Front
[U SYNC INT/EXT (sync internal/
extenal) selector
gg LINE/RGB Input selector
[E A/B, RGB/Y R-Y B-Y input
seiector ftici
(9 Q) 9
IBLUE ONLY selector
EUNDER SCAN selector •
Eil H/V DELAY selector
ER/G/B BIAS and GAIN'
adjustment controls
©©©©©©El
Q] Tally lamp
-{2] POWER switch and
indicator
-[H VOLUME control
-[4] CONTR (contrast) control
-[5] PHASE control
-E CHROMA control
“H] BRIGHT (brightness) control
-E APER (aperture) control
ETally lamp
EPOWER switch and indicator
Depress to turn the monitor on. The indicator will light
up in green.
The POWER indicator also functions as the battery
indicator. When the internal battery becomes weak or
the power supplied through the DC12VIN jack
decreases, the Indicator flashes.
EVOLUME control
Turn this control clockwise or counterclockwise to obtain
the desired volume.
ECONTR (contrast) control
Turn clockwise to make the contrast stronger and
counterclockwise to make it weaker.
EPHASE control
This control is effective only for the NTSCa.ss and
NTSC4.43 color systems. Turn clockwise to make the skin
tones greenish and counterclockwise to make them
purplish.
Notes
•The PHASE, CHROMA and APER control settings have no
effect on an analog RGB signal.
•The PHASE control has no effect on component singals.
•The PHASE control setting is effective only for the NTSC system.
ECHROMA control
Turn clockwise to make the color intensity stronger and
counterclockwise to make it weaker.
EBRIGHT (brightness) control
Turn clockwise for more brightness and
counterclockwise for less.
EAPER (aperture) control
Turn clockwise for more sharpness and
counterclockwise for less.
ESYNC INT/EXT (sync internal/external) selector
Keep this button released (INT) to operate the monitor
on the sync signal from the displayed composite video
signal.
Depress this button (EXT) to operate the monitor on an
external sync signal fed through the EXT SYNC connec-
tor on the rear panel.
—6—

PVM-8041Q/8044Q
LINE/RGB input selector
Select the program to be monitored. Keep this button
released (LINE) for asignal fed through the LINE Aor
LINE Bconnectors. Depress this button (RGB) for a
signal fed through the RGB connectors.
[E A/B, RGB/Y R-Y B-Y input selector
When the LINE/RGB input selector is set to LINE,
keep this button released (A) for asignal fed through the
LINE Aconnectors. Depress this button (B) for asignal
fed through the LINE Bconnectors.
When the LINE/RGB input selector is set to RGB,
select the RGB signal or the component signal which is
fed through the RGB input connectors. Keep this button
released (RGB) for the RGB signal. Depress this button
(Y R-Y B-Y) for the component signal.
EBLUE ONLY selector
Depress this button to turn off the red and green signals.
Ablue signal is displayed as an apparent monochrome
picture on the screen. This facilitates “chroma” and
“phase” control adjustments and the observation of video
noise.
[E UNDER SCAN selector
Depress this button for underscanning. The display size
is reduced by approximately 3% so that four corners of
the raster are visible.
HH/V DELAY selector
Depress this button to observe the horizontal and
vertical sync signals at the same time. The horizontal
sync signal is displayed In the left quarter of the screen;
the vertical sync signal is displayed near the center of
the screen.
[E R/G/B BIAS and GAIN adjustment controls
Used for white balance fine adjustment.
BIAS and GAIN controls are provided for the R(red),
G(green) and B(blue) screens.
BIAS: Adjust the white balance and brightness of the
screen at the lowlight.
GAIN: Adjust the white balance and brightness of the
screen at the highlight.
—7—

PVM-8041Q/8044Q
[H LINE Aconnectors
To monitor the signal fed through these connectors,
keep the LINE/RGB selector and the A/B, RGB/Y R-Y B-
Yselector on the front panel released (LINE and A).
Note
The Y/C IN connector has a priority over the VIDEO IN
connector.
When aplug is connected to the Y/C IN connector, the
VIDEO IN connector is automatically disconnected.
liE LINE Bconnectors
To monitor the signal fed through these connectors,
keep the LINE/RGB selector released (LINE) and
depress the /VB, RGB/Y R-Y B-Y selector (B) on the
front panel.
VIDEO IN (BNC): Connect to the video output of avideo
camera, VCR or other video equipment.
VIDEO OUT (BNC): Loop-through output of the VIDEO
IN connector. Connect to the video input of aVCR or
another monitor.
AUDIO IN (phono jack): Cohnect to the audio output of
aVCR or amicrophone (through asuitable
microphone amplifier).
AUDIO OUT (phono jack): Loop-through output of the
AUDIO IN connector. Connect to the audio input of a
VCR or another monitor.
El TALLY/REMOTE connector (8-pln mini DIN)
Connect to the tally output of acontrol console,
special-effect generator, etc. The tally lamp on the front
panel will be turned on and off by the connected
equipment. This connector can be used for connecting a
remote controller. For the pin assignment of this
connector, see “Specifications” on page 2.
Oil EXT SYNC (external sync) connectors
IN (BNC): When this monitor operates on an external
sync signal, connect the reference signal from async
generator to this connector. In this case, depress the
SYNC INT/EXT selector (EXT) on the front panel.
OUT (BNC): Loop-through output of the EXT SYNC IN
connector. Connect to the external sync input of video
equipment to be synchronized with this monitor.
VHOLD (vertical hold) control
Turn to stabilize the picture if it rolls vertically.
IE DC 12V IN jack (XLR, 4pin)
Connect the Sony AC-500 AC power adaptor (not
supplied).
—8—

PVM-8041Q/8044Q
RGB/component input connectors
R/R-Y, G/Y, B/B-Y (BNC), AUDIO (phono):
To monitor asignal fed through these connectors,
depress the LINE/RGB selector on the front panel
(RGB). When the SYNC INT/EXT selector on the front
panel is released (INT), the monitor operates on the
sync signal from the G/Y channel.
To monitor the analog RGB signal
Connect to the analog RGB signal outputs of avideo
camera having no sync signal. Keep the A/B, RGB/Y
R-Y B-Y selector on the front panel released (RGB).
To monitor the component signal
Connect to the R-Y/Y/B-Y component signal outputs of a
Sony BetaCam video camera. Depress the A/B, RGB/Y
R-Y B-Y selector on the front panel (Y R-Y B-Y).
I
AC IN socket
Connect the supplied AC power cord to this socket and
to awall outlet.
@EJECT buttons
Press the EJECT button upwards to remove the battery
pack.
BATTERY compartments
Insert the NP-1 A/1 Bbattery pack (not supplied).
1-3. POWER SOURCES
House Current
Connect the supplied AC power cord to the AC IN socket
and to awall outlet. When the AC power cord is plugged into the AC IN socket,
the battery pack (if installed) or the AC power adaptor
(if connected) is automatically disconnected.
Rechargeable Battery
The monitor can operate with one or two battery packs.
For extended use, two battery packs are recommended. To remove the battery pack, press the EJECT button
upwards.
For charging, use the BC-1 WA battery charger (not
supplied) for the NP-1 Aor the BC-1WB for the NP-1B.
Note
Make sure that the AC power cord and the AC power
adaptor are disconnected from the monitor. Otherwise, the
monitor cannot operate on the battery pack(s).
—9—

PVM-8041Q/8044Q
MEMO
—10 —

PVM-8041Q/8044Q
SECTtON 2
DISASSEMBLY
2-1. CABINET REMOVAL ®Four screws (claw)
2-2. BBOARD REMOVAL
—11 —

PVM-8041Q/8044Q
2-3. SWITCHING REGULATOR REMOVAL
2-4. DBOARD REMOVAL
—12 —

PVM-8041Q/8044Q
2-5. PBOARD REMOVAL
CN802
2-6. REAR ASSY REMOVAL ©Four screws
—13 —

PVM-8041Q/8044Q
2-7. HA AND FA BOARDS REMOVAL
FA board
—14

PVM-8041Q/8044Q
2-8.PICTURE TUBE REMOVAL (D CA board
Note ;Caution for ANODE CAP installation. 3. Use KE-490RTV (RTV silicone adhesive, SHIN-ETSU
When you replace PICTURE TUBE or FBT, remove RTV on CHEMICAL).
ANODE CAP so that PICTURE TUBE and FBT can be separated. Part. No. Description
Please adhere picture tube and anode cap in accordance with the 7-322-065-19 Silicone (RTV) KE-490W
following procedure. 4. Install ANODE CAP.
5. Adeguately apply RTV to the entire picture tube anode area,
ADHERING PROCEDURE OF ANODE CAP. piace the anode cap onto the picture tube and push it down
1. Clean PICTURE TUBE ANODE CAP with ethnaol to remove securety so that no air pockets remain beneath the cap.
original RTV. 6. Dry more than 12 hours at room temperature.
2. Dry clean face with air.
•REMOVAL OF ANODE-CAP
•REMOVING PROCEDURES
©Turn up one side of the rubber cap in
the direction indicated by the arrow®. @Using athumb pull up the rubber cap
firmly in the direction indicated by the
arrow ®.
•HOW TO HANDLE AN ANODE-CAP
©Don’t hurt the surface of anode-caps with sharp
shaped material!
@Don’t press the rubber hardly not to hurt inside of
anode-caps!
Ametal fitting called as shatter-hook terminal is built
in the rubber.
®Don’t turn the foot of rubber over hardly!
separated from the anode button, the
anode-cap can be removed by turning
up the rubber cap and pulling up it in
the direction of the arrow ©.
—15 —

PVM-8041Q/8044Q
SECTION 3
SET-UP ADJUSTMENTS
•The following adjustments should be made when acomplete
realignment is required or anew picture tube is installed.
•These adjustments should be performed with rated power supply
voltage unless otherwise noted.
The control and switch below should be set as follows unless otherwise
noted;
CONTRASTcontrol 80%
BRIGHTNESS control 50%
Perform the adjustments in order as follows:
3-1. Beam Landing
3-2. Convergence
3-3. Focus
3-4. White Balance
Note: Test equipment Required.
1. Color Bar/Pattern Generator
2. Degausser
3. Color Analyzer (Minolta)
4. Luminance Level Meter
3-1. BEAM LANDING
Precaution
1. Set the side of the unit with the PICTURE TUBE so that it faces
east or west in order to reduce the influence of external magnetic
force.
2. Turn the power switch for the unit ONanderase the magnetic force
using adegausser.
(1) Beam Landing
1.Receive an entirely white signal with the pattern generator.
CONTRAST MAX.
BRIGHTNESS set ea.sy to observe
2. Adjust the white balance, G2 voltage and convergence roughly.
3. Loosen the deflection yoke mounting screw, and set the purity
control to the center as shown in Fig.3-1.
4. Switch over the pattern generator to green.
5. Move the deflection yoke backward, and adjust with the purity
control so that green is in the center and blue and red are at the
sides, evenly. (Fig.3-2)
6. Move the deflection yoke forward, and adjust so that the entire
screen becomes green. Repeat 5to 7as to red and blue.
7. When landing at the corners is not right, correct by using the
magnet. (Fig.3-3)
8. When the position of the deflection yoke is determined, tighten it
with adeflection yoke mounting screw.
CAUTION: When correction magnet is used, be sure to
degauss the unit.
Purity control corrects
this area. Disk magnets or
rotatable disk
magnets correct
these area (a-d).
Deflection yoke positioning
corrects these areas.
—16 —Fig.3-3

PVM-8041Q/8044Q
3-2. CONVERGENCE
(1 )Horizontal and vertical Static Convergence Adjustment
on the Center of Screen.
•Before starting, perform V. SIZE, V. CENT, H.SIZE, H.CENT
and Screen Distortion Adjustment rightly.
(Static Convergence Adjustment)
1. Receive adot signal, setting BRIGHTNESS minimum and set
CONTRAST to normal.
2. Adjust H.STAT VR to coincide red, green and blue dots on the
center of screen. (Horizontal movement)
3. Adjust V.STATmagnet to coincide red, green and bl ue dots on the
center of screen. (Vertical movement)
4.
When the V.STAT magnet is moved in the direction of arrow A
and b, red, green and blue dots move as shown below.
®When moving the V.STAT Magnet open or close.
(OPEN)
/
(CLOSE)
B()
I
—
RoI
Bo
Qo
Ro
1
(2) When moving the V.STAT magnet counterclockwise.
RG
e—
^
B
(3) When moving the V.STAT magnet clockwise.
@When tilt the V.STAT magnet and open or close.
(CLOSE) (OPEN)
RC^
G\b \r
*If the red and green dots do not coincide with blue dot, adjustment
with BMC (6-poles) magnet.
5.
HMC and VMCcorrection for BMC (6-Poles) magnet.
®HMC(Horizontal Misconvergence) correction and motion of the
Electron Beam with the BMC (6-poles) magnet.
*If the red, green and blue dots do not coincide on the center of
screen with H.STAT VR, perform adjustment using V.STAT at
the same time while tracking.
(Tilt the V.STATmagnet and adjust static convergence to open or
close the V.STAT magnet.)
HMC Correction RGB
OOO
U—
)
A.^ B
RGB
OOO
AB
HMC Correction
A>B
A=B
GB
OO
A*B
RGB
OOO
AB
—17 —

PVM>8041Q/8044Q
VMC (Vertical Misconvergeiice) correction and motion of the
Electron Beam with the BMC (6-poles) magnet.
VMC Correction (A) VMC Correction (B)
^BB
C>D C=D
r-OR^r-O R
CG^
DG
i-O B
purity magnet
(2) Horizontal and Vertical Dynamic Convergence
Adjustment at the Environs of the Screen (Dynamic
Convergence Adjustment)
1.When there is misconvergence at the sides of screen, adjust for best
convergence as follows by moving the deflection yoke.
2. Loosen deflection yoke screw. Remove deflection yoke spacers.
Move the deflection yoke for best convergence. Tighten the
deflection yoke screw. Install three deflection yoke spacers.
—18 —

PVM-8041Q/8044Q
Screen-corner Convergence
3-3. FOCUS
1.Receive the broadcast.
2. CONTRAST ^Normal
3. Adjust FOCUS control so that the focus on the center of screen
becomes to the best.
3-4. WHITE BALANCE
[Screen (G2) Voltage Adjustment]
1.Receive a dot signal with the pattern generator.
2. Adjust R. G. Bcut-off controls so that respective cathode voltage
against ground becomes 103VDC.
3. Observing the screen, adjust SCREEN control so that the back-
ground of the dot signal is bright dimly.
[White Balance]
1. Receive acolor-bar pattern signal with the pattern generator.
(Make black and white screen by chroma switch off.)
2. •BRIGHTNESS 50%
•CONTRAST Minimum
•CHROMA 50%
•DRIVE control Mechanical center
•BKG control Mechanical center
3. Adjust RV118 (SUB BRT) on Bboard so that the blue stripe
portion on the color-bar pattern signal is bright dimly.
color-bar pattern ,
,
4. Receive an entirely white signal from the pattern generator.
5. CONTRAST 70% (90 degree clockwise from
mechanical center.)
6. Using the luminance level meter, adjust the luminance level ofthe
pattern generator becomes 3Nits. (The condition the screen is
bright dimly.)
7. Adjustwhitebalanceatcut-offusingRVl 19(G-C/0)andRV121
(B-C/0).
8. Change the all-white signal luminance level to 100 IREs.
9. Adjust white balance at high-light using RV120 (G-GAIN) and
RV121 (B-GAIN).
10. Change the unit to blue ONLY mode.
11. Adjust white balance (at high-light) in blue ONLY mode using
RV124 *R-GAIN/BL) and RV125 (G-GAIN/BL).
12. Using the luminance level meter, adjust the luminance level ofthe
pattern generator becomes 8Nits. Confirm that white balance at
cut-off is satisfactory..
—19 —

PVM-8041Q/8044Q
SECTION 4
SAFETY RELATED ADJUSTMENT
4-1. SAFETY RELATED ADJUSTMENTS
B+ MAX CONFIRMATION (BRV651)
Thefollowing adjustments should always be performed when replacing
thefollowingcomponents (marked with 3on the schematic diagram).
3on Gboard :(Power supply block)
1C601, 1C651, PH602, C655, R653, R655, R636, R657, RV651.
1. For US model, supply 13()V VAC with variable auto-
transformer.
2. Receive adot signal.
3. •CONTRAST Minimum
•BRIGHTNESS Minimum
4. Connect adigital multimeter to RY1601 pin-® of Dboard.
5. Turn RV651 on the Gboard fully clockwise. Confirm that the
voltage of RY1601 pin-® is less than 41.9V DC.
6. If step 5is not satisfied, readjust theRV65 1.After adjusting, fasten
RV651 in place with epoxy.
B+ MAX IN DC POWER INPUT MODE, CONFIRMATION
(BRV1603)
The following adjustments should always be performed when replacing
thefollowingcomponents (mtirked with 3onthe schematicdiagram).
3on Dboard
:
Q1601,Q1602,Q1603,D1601, 01602, D1603,D1604,D160.3,C16()1,
C1602,R1601,R1602,R1603,R1604,R1605,R1606,R1607,R1608,
R1 629, R1628, R1630, RV1601 ,RV 1603.
1. Supply DC 12V!S‘' Vfrom DC 12V IN connector.
2. Receive adot signal.
3. •CONTRAST Minimum
•BRIGHTNESS Minimum
4. Connect adigital multimeter to C1605 positive -i- side of Dboard.
5. Turn RV1601 on the Dboard fully clockwise. Confirm that the
voltage of Cl 605 +pin is less than 41.9V DC.
6. If step 5is not satisfied, readjust the RV1603. After adjusting,
fasten RV1603 in place with epoxy.
HOLD-DOWNCIRCUITCONFIRMATION( BRV833)AND
READJUSTMENTS
Thefollowing adj ustments should always be performed when replacing
the following components (marked with 3on the schematic diagram).
3on Dboard;
IC502, Q833, Q834, Q835, Q836, D835, D836, C519, C814, C843,
C844, C845, C846, C847, C848, RV833, R523, R850, R851, R852,
R853, R854, R855, R856, R857, R858, R859, R861, R862, R863,
NL801.
3on Pboard;NL801 ,T802 (FBT)
1.Receive an entire white signal.
2. •CONTRAST Maximum
•BRIGHTNESS Maximum
3. Connect adigital multimeter to the TP85 (CN503 pin-®).
4. Confirm the voltage is 14.1 ±3.0V DC.
5. Receive adot signal.
6. Connect an ammeter between Dboard CN503 pin-® and Pboard
CN801 pin-®.
7. Adjust BRIGHTNESS and CONTRAST so that the current is
IABL=160±30|4A.
8. Apply an external DC voltage gradually to TP85. When the
voltage becomes 18.5V ±0. 1VDC, confirm the HOLD-DOWN
circuit operates immediately and raster disappears.
9. When external DC voltage at TP85 becomes 17.5V ±0.1 VDC,
confirm the HOLD-DOWN circuit doesn’t operate.
10. Receive an entire white signal.
11.Adjust with BRIGHTNESS and CONTRASTcontrols so that the
current is Iabl =520 ±30 pA.
12. Apply DC voltage of 17.8V +0. 1Vto TP85. Confirm the HOLD-
DOWN circuit operates immediately and raster disappears.
13. With the same set-up as steps 10and 11,supply 16.8V+ 0. 1VDC
toTP85. Confirm that the HOLD-DOWN circuitdoesn’toperate.
14. When above specifications are not satisfied, readjust RV833.
After adjusting, fasten RV833 in place with epoxy.
—20 —