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
Video signal
Color system PAL, SECAM, NTSC 3 58 , NTSC+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 performance
Normal scan 6% over scan of CRT effective screen
Underscan 3% underscan of CRT effective screen
area
H. linearity Less than 7.0% (typical)
V. linearity Less than 7.0% (typical)
Convergence 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, B channels: 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
Y channel: 0.7 Vp-p, ± 6 dB
(Standard color bar signal of 75%
chrominance)
EXT SYNC IN: BNC connector
Composite sync 4 Vp-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.)
General
Inputs and Outputs Power consumption 45 W Max at AC operation
38 W at DC operation
Inputs Y/C IN: 4-pin mini DIN connector
(See the pin assignment on page 2.)
VIDEO IN: BNC connector
1 Vp-p ± 6dB, sync negative
AUDIO IN: phono jack, -5 dBs, less
than 47k ohms - Continued on next page -
TRINITRON .COLOR VIDEO MONITOR

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-+40 °C
Humidity 0 - 90%
Dimensions Approx. 217 x 217 x 352.5 mm (w/h/d)
(8 5 /e x 8 5 /8 x 14 inches)
not incl. projecting parts and controls
Weight Approx. 7.8 kg (17 lb 3 oz)
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 DIN)
Pin No.
Signal
Description
1
Y-input
1 Vp-p, sync negative,
75 ohms
2
CHROMA sub-carrier-
input
300 mVp-p, burst
Delay time between Y
and C: within 0±100 nsec.,
75 ohms
3
GND for Y-input
GND
4
GND for CHROMA-
input
GND
TALLY/REMOTE connector (8-pin mini DIN)
Pin No.
Signal
1 Blue only
2 H/V delay
3
GND
4 INT/EXT SYNC
5
Tally
6
Underscan/normal scan
7
A/B or RGB/component
8
RGB/LINE
For remote control, connect the pin of the desired function to
pin 3 (GND).
— 2 —

PVM-8041Q/8044Q
SAFETY CHECK-OUT
(US Model only)
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, particularly 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 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 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.
LEAKAGE
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 0.5 mA (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
instruments.
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 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 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 coldwater 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)
9. C heck the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage. Check
leakage as described below.
0.15pF i 4 1 - 5kQ
AC
voltmeter
(0.75V)
-= ■ Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
— 3 —

PVM-8041Q/8044Q
TABLE OF CONTENTS
Section Title Page
1. G ENERAL
1-1. Features. 5
1 -2. Location and Function of Parts and Controls. 6
1-3. Power Sources. 9
2. D ISASSEMBLY
2-1. Cabinet Removal. 11
2-2. B Board Removal. 11
2-3. Switching Regulator Removal. 12
2-4. D Board Removal. 12
2-5. P Board 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
(CAUTION)
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE
ANODE CAPTOTHE METAL CHASSIS, CRT SHIELD, 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 A 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 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.
Section Title Page
4. S AFETY RELATED ADJUSTMENT
4-1. Safety Related Adjustments. 20
5. CIRCUIT ADJUSTMENTS
5-1. D Board Adjustments. 22
5-2. B Board Adjustments. 25
5-3. S Board Adjustments. 30
6. D IAGRAMS
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. E XPLODED VIEWS
7-1. Chassis. 80
7-2. Picture Tube. 81
8. ELECTRICAL PARTS LIST. 82
(ATTENTION)
APRES AVOIR DECONNECTE LE CAP DE L'ANODE,
COURTCIRCUITER L'ANODE DU TUBE CATHODIQUE ET CELUI
DE L'ANODE DU CAP AU 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 DEPANNAGE.
LE CHASSIS DE CE RECEPTEUR EST DIRECTEMENT
raccordE A L'ALIMENTATION secteur.
ATTENTION AUX COMPOSANTS RELATIFS ALA
sEcuritEm
LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET PAR UNE
MAPQUE A SUR 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
COMPOSANTS SONY DONT LE NUMERO DE PIECE EST INDIQUE
DANS LE PRESENT MANUEL OU DANS DES SUPPLEMENTS
PUBLlES 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
FouTpotor system n available
The monitor can display PAL, SECAM, NTSC3.58 and
NTSC4.43* signals. The appropriate color system is selected
automatically.
* A signal of NTSC443 is used for playing back NTSC recorded
video cassettes with a video tape recorder/player especially
designed for use with this system.
Super Fine Pitch Trinitron
(PVM-8044Q only)
The Super Fine Pitch Trinitron picture tube provides a high
resolution picture. Horizontal resolution is more than 450
TV lines at the center of the 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.
Autooii^ bnhlMMM V >
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 a cable is
connected to an output connector, the 75-ohm termination is
automatically released.
EIA standard 19-inch rack mounting
By using an MB-S07 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.
The video signal, split into the chrominance 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 a composite video signal, assuring
video quality.
Brain currant feedback droit
The built-in beam current feedback circuit assures stable
white balance.
CombWlsr
When NTSC video signals are received, a comb filter
activates to increase the resolution, resulting in fine picture
detail without color spill or color noise.
For the Customers in the USA
INFORMATION
This equipment has been tested and found to comply with
the limits for a Class A digital device, pursuant to Part 15 of
the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the
equipment is operated in a commercial 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 a residen¬
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 the Customers In Canada
This apparatus complies with the Class A limits for radio
noise emissions set out in Radio Interference Regulations.

PVM-8041Q/8044Q
1-2. LOCATION AND FUNCTION OF PARTS AND CONTROLS
CD Tally lamp
[H POWER 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 DC12V IN jack
decreases, the indicator flashes.
S VOLUME control
Turn this control clockwise or counterclockwise to obtain
the desired volume.
[H CONTR (contrast) control
Turn clockwise to make the contrast stronger and
counterclockwise to make it weaker.
® PHASE control
This control is effective only for the NTSC3.58 and
NTSC4.43 color systems. Turn clockwise to make the skin
tones greenish and counterclockwise to make them
purplish.
• 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.
GE CHROMA control
Turn clockwise to make the color intensity stronger and
counterclockwise to make it weaker.
0 BRIGHT (brightness) control
Turn clockwise for more brightness and
counterclockwise for less.
[U APER (aperture) control
Turn clockwise for more sharpness and
counterclockwise for less.
E SYNC 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.

® LINE/RGB input selector
Select the program to be monitored. Keep this button
released (LINE) for a signal fed through the LINE A or
LINE B connectors. Depress this button (RGB) for a
signal fed through the RGB connectors.
® 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 a signal fed through the
LINE A connectors. Depress this button (B) for a signal
fed through the LINE B connectors.
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.
0H BLUE ONLY selector
Depress this button to turn off the red and green signals.
A blue signal is displayed as an apparent monochrome
picture on the screen. This facilitates “chroma” and
“phase” control adjustments and the observation of video
noise.
[1! 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.
Ql H/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.
® .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.

PVM-8041Q/8044Q
Rear
EH LINE A connectors
To monitor the signal fed through these connectors,
keep the LINE/RGB selector and the A/B, RGB/Y R-Y B-
Y selector on the front panel released (LINE and A).
U33
The Y/C IN connector has a priority over the VIDEO IN
connector.
When a plug is connected to the Y/C IN connector, the
VIDEO IN connector is automatically disconnected.
EH LINE B connectors
To monitor the signal fed through these connectors,
keep the LINE/RGB selector released (LINE) and
depress the A/B, RGB/Y R-Y B-Y selector (B) on the
front panel.
VIDEO IN (BNC): Connect to the video output of a video
camera, VCR or other video equipment.
VIDEO OUT (BNC): Loop-through output of the VIDEO
IN connector. Connect to the video input of a VCR or
another monitor.
AUDIO IN (phono jack): Connect to the audio output of
a VCR or a microphone (through a suitable
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.
E3 TALLY/REMOTE connector (8-pin mini DIN)
Connect to the tally output of a control 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.
HH EXT SYNC (external sync) connectors
IN (BNC): When this monitor operates on an external
sync signal, connect the reference signal from a sync
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.
|g] V HOLD (vertical hold) control
Turn to stabilize the picture if it rolls vertically.
[HI DC 12V IN jack (XLR, 4 pin)
Connect the Sony AC-500 AC power adaptor (not
supplied).

PVM-8041Q/8044Q
HO RGB/component input connectors
R/R-Y, G/Y, B/B-Y (BNC), AUDIO (phono):
To monitor a signal 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 a video
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).
M AC IN socket
Connect the supplied AC power cord to this socket and
to a wall outlet.
[HI EJECT buttons
Press the EJECT button upwards to remove the battery
pack.
Hj] BATTERY compartments
Insert the NP-1 A/1 B battery pack (not supplied).
1-3. POWER SOURCES
House Current
Connect the supplied AC po\
and to a wall outlet.
tJ§o
T --—fg 1 - f M 1 —
/ver cord to the AC IN socket
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.
|l- T
[HI to AC IN
!_
to a wall outlet
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-1WA battery charger (not
supplied) for the NP-1 A or the BC-1WB for the NP-1B.
Bill
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