Sony VX-14MW1U Manual de usuario

SONY Corporation.

Service Manual

TV / VCR Combination

CHASSIS : CP-082S

Model : VX-14MW1U/14MW1E

VX-21MW1U/21MW1E

SPECIFICATIONS

ITEMS MODEL VX-14MW1U/14MW1E REMARK

VX-21MW1U/21MW1E

TV SECTION STANDARD PAL-I/II(UK MODEL),PAL-B/G(CONTINENTAL MODEL)

SCREEN SIZE 14” : A34EAC01X..

21” : A51EAL...X..

MAIN VOLTAGE 220~240V AC,50Hz

POWER STAND BY MODE : BELOW 5 Watts

CONSUMPTION OPERATION MODE : 14”=50Watts, 21”=63Watts

SOUND OUTPUT 1Wmin

SPEAKER 3Watts 8 Ohm

ANTENNA IMPEDANCE 75 Ohm unbalanced input

TUNING SYSTEM FVS(FREQUENCY SYNTHESIS) TUNING

TUNER VHF-L : E2-S10, VHF-H : E5-S39, UHF : S40-E69 (PAL-I=UHF ONLY)

NUMBER OF PROGRAM 100 PROGRAM

AUX. TERMINAL SCART JACK(REAR) , RCA JACK(AV2 FRONT), HEADPHONE JACK

REMOTE CONTROLLER RM-Z5403/04 with 2 “AAA” type batteries

OTHER FEATURE ON SCREEN DISPLAY, SLEEP TIMER, WAKE UP TIMER, FULL AUTO SEARCH,

MANUAL/FINE TUNING,CHILD LOCK, PANEL LOCK, AUTO REPEAT,

PICTURE TYPE SELECTION (LIVE, NORMAL, FAVOURITE), INDEX SEARCH, TV/AV

VIDEO SINGLE SYSTEM PAL colour and CCIR mono chrome signals, 625lines/50fields.

SECTION RECORDING SYSTEM 2HEAD

INPUT 1Vp-p, 75 ohm, unbalanced

OUTPUT 1Vp-p, 75 ohm, unbalanced

SIGNAL TO NOISE RATIO 43dB with NETTETE IMAGE control at center position

HORIZONTAL RESOLUTION 230lines with NETTETE IMAGE control at center position

AUDIO RECORDING SYSTEM LONGITUDINAL TRACK

INPUT -3.8dBm(500m Vrms), more than 47 Kohms, unbalanced

OUTPUT -3.8dBm(500m Vrms), less than 1 Kohms, unbalanced

FREQUENCY RANGE 100Hz to 6KHz

SIGNAL TO NOISE RATIO 30dB(more than)

GENERA TEMPERATRE 5 o C to 35 o C(operating), -20 o C to 60 o C (storage temperature)

FORMAT standard

TAPE WIDTH 12.65mm

TAPE SPEED SP : 23.39mm/sec, LP : 11.70mm/sec

WITH FULLSIZE SP : 240 min, win E-240 video cassette

CASSETTE LP : 480min, win E-240 video cassette

S/M No. : 9-927-470-01

Nov. 2003

-1-

SAFETY INSTRUCTION 2

SPECIFICATION 3

CIRCUIT BLOCK DIAGRAM 4

ALIGNMENT INSTRUCTIONS 5

SERVICE REMOCON DIAGRAM 8

SCHEMATIC DIAGRAM 11

EXPLODED VIEW 13

PRINTED CIRCUIT BOARD 15

COORDINATES OF MAIN PCB

SERVICE PARTS LIST22

TECHNICAL SERVICE GUIDE

PART I

PART II

SAFETY INSTRUCTION

-2-

WARNING:BEFORE SERVICING THIS CHASSIS,

READ THE X-RAY RADIATION

PRECAUTION , SAFETY

PRECAUTION AND PRODUCTION

SAFETY NOTICE BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially

hazardous X-RAY RADIATION. To avoid such

hazards, the high voltage must not exceed the

specified limit

The nominal value of the highvoltage of this

receiver is 23-25KV 14 ), 25~29KV 21 ) at max.

beam current, The high voltage must not,under

any circumstances, exceed 26KV 14 ),

31KV 21 ).

Each time a receiver requires servicing,the high

voltage should be checked.

It is recommended the reading of the high

voltage be recorded as a part of the service

records, It is important to use an accurate and

reliable high voltage meter.

2. The only source of X-RAY radiation in this TV

receiver is the picture tube. For continuous X-

RAY RADIATION protection, the replacement

tube must be exactly the same type tube as

specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this

receiver is operating. Operation of the receiver

outside the cabinet or with the back board

removed involves a shock hazard from the

receiver.

1) Servicing should not be attempted by anyone

who is not thoroughly familiar with the

precautions necesary when working on high

voltage equipment.

2) Always discharge the picture tube before

handling the tube.The picture tube is highly

evacuated and if broken, glass fragments will be

violently expelled.

2. If any fuse in this TV receiveris blown, replace it

with the FUSE specified in the Replacement

Parts list.

3. When replacing a high wattage resistor metal

oxide film resistor) in circuit board, keep the

resistor 10mm away from circuit board.

4. Keep wires away from high voltage or high

temperature components.

5. This receiver must operate under AC260 volts,

50Hz. NEVER connect to DC supply or any other

power or frequency.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this have

special safety-related characteristics.

These characteristics are often passed unnoticed

by a visual inspection and the X-RAY RADIATION

protection afforded by them cannot necessarily be

obtained by using replacement components rated

for higher voltage, wattage, etc. Replacement parts

which have these special safety characteristics are

identified in this manual and its

supplements, electrical components having such

features are identified by designated symbol on the

parts list.

Before replacing any of these components,read the

parts list in this manual carefully.

The use of substitute replacement parts which do

not have the same safety characteristics as

specified in the parts list may create X-RAY

Radiation.

SPECIFICATION

-3-

ITEMS MODEL VX-14MW1U/14MW1E

REMARK

VX-21MW1U/21MW1E

TV STANDARD PAL-I/II(UK MODEL),PAL-B/G(CONTINENTAL MODEL)

SECTION SCREEN SIZE 14”A34EAC01X..

21”A51EAL...X..

MAIN VOLTAGE 220~240V AC,50Hz

POWER STAND BY MODE BELOW 5 Watts

CONSUMPTION OPERATION MODE 14”=50Watts, 21”=63Watts

SOUND OUTPUT 1Wmin

SPEAKER 3Watts 8 Ohm

ANTENNA IMPEDANCE

75 Ohm unbalanced input

TUNING SYSTEM FVS(FREQUENCY SYNTHESIS) TUNING

TUNER VHF-L E2-S10,

VHF-H E5-S39,

UHF S40-E69 (PAL-1=UHF ONLY)

NUMBER OF PROGRAM

100 PROGRAM

AUX, TERMINAL

SCART JACK(REAR) , RCA JACK(AV2 FRONT), HEADPHONE JACK

REMOTE CONTROLLER

RM-Z5403/04 with 2 AAA type batteries

OTHER FEATURE ON SCREEN DISPLAY, SLEEP TIMER, WAKE UP TIMER

FULL AUTO SEARCH, MANUAL/FINE TUNING

CHILD LOCK, PANEL LOCK, AUTO REPEAT,

PICTURE TYPE SELECTION (LIVE, NORMAL, FAVOURITE),

INDEX SEARCH, TV/AV

VIDEO SINGLE SYSTEM PAL colour and CCIR mono chrome signals, 625lines/50fidlds.

SECTION RECORDING SYSTEM 2 HEAD

INPUT 1Vp-p, 75 ohm, unbalanced

OUTPUT 1Vp-p, 75 ohm, unbalanced

SIGNAL TO NOISE RATIO

43dB with NETTETE IMAGE control at center position

HORIZONTAL RESOLUTION

230lines with NETTETE IMAGE control at center position

AUDIO RECORDING SYSTEM LONGITUDINAL TRACK

INPUT -3.8dBm(500m Vrms), more than 47 Kohms, unbalanced

OUTPUT -3.8dBm(500m Vrms). less than 1 Kohms, unbalanced

FREQUENCY RANGE 100Hz to 6KHz

SIGNAL TO NOISE RATIO

30dB(more than)

GENERA TEMPERATRE 5 C to 35 C(operating)

-20 C to 60 C (storage temperature)

FORMAT standard

TAPE WIDTH 12.65mm

TAPE SPEED SP 23.39mm/sec, LP 11.70mm/sec

WITH FULLSIZE SP 240 min, win E-240 video cassette

CASSETTE LP 480min, win E-240 video cassette

CIRCUIT BLOCK DIAGRAM

-5-

ALIGNMENT INSTRUCTIONS

1. MAIN TUNER AGC

1) Set a Pattern Generator with RF level 65 2 dBuV, 210.25 MHz.

2) Connect a OSCILLOSCOPE PROBE to P101 pin #1) , TUNER AGC INPUT).

3) Adjust AGC UP/DOWN KEY the voltage drop about 1V DC over below it s maximum voltage.

2. SUB TUNER AGC

1) Set a pattern Generator with RF level 65 2dBuV, 210.25 MHz

2) Connect a OSCILLOSCOPE PROBE to P101 pin #3)

3) Press the REC-B key two times.

4) Ajust R157 on the MAIN PCB the voltage drop about 1V DC over below it s maximum voltage.

3. SCREEN

1) Apply a COLOR BAR PATTERN SIGNAL.

2) Press the SCREEN KEY.

3) Connect a OSCILLOSCOPE PROBE to P901 CRT CATHODE R,G,B )

4) Adjust the screen volume on FBT such that the highest black level voltage 120V 5Vdc.

* Another methode

1) Press AV Key in condition of AV no signal.

2) Press the SCREEN KEY.

3) Connect a OSCILLOSCOPE PROBE to P901 CRT CATHODE R,G,B )

4) Adjust the screen volume on FBT such that the highest black level voltage 140V 5Vdc.

4. WHITE BALANCE

1) Apply a COLOR BAR PATTERN SIGNAL.

2) Adjust the R,G,B UP/DOWN KEY of the other color which did not appear on the screen to obtain

WHITE.

5. FOCUS

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the FOCUS VOLUME on FBT to obtain optimal resolution.

6. GEOMETRY

6-1. S-CORRECTION

1) Apply a CROSSHATCH PATTERN SIGNAL.

2) Adjust the S-CORR UP/DOWN KEY obtain the same distance between

horizontal lines.

6-2. VERTICAL SLOPE

1) Apply a RETMA PATTERN SIGNAL.

2) Pressing the V-SLOPE +/- KEY, the lower half of the screen is blanked.

3) Adjust the border line of blanked picture coincident with the center marks of

the patte using the V-SLOPE +/- KEY.

6-3. VERTICAL CENTER

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the center line of pattern coincident with the mechanical center marks

of the CRT using the V-CENTER +/- KEY.

6-4. VERTICAL SIZE

* The V-CENTER adjustment has to be done in advance.

1) Apply a RETMA PATTERN SIGNAL.

2) Adjust the upperside of the pattern coincident with the mechanical center

marks of the CRT using the V-SIZE +/- KEY.

-6-

ALIGNMENT INSTRUCTIONS

6-5. HORIZONTAL CENTER

1) Apply a RETMA PATTERN SINGNAL.

2) Adjust picture centering with H-CENTER +/- KEY.

7. DECK ADJUSTMENT

7-1. X-POSITION AND P2,P3 ADJUSTMENT

1) Adjust point X-POSITION

Checking point oscilloscope ch1 = H/SW (PY03 #6)

oscilloscope ch2 = PB ENVE (PY03 #4)

Triggering CH1

Measuring Equipment oscilloscope, path jig

Mode PLAYBACK, ATK OFF

Test tape DP-2 (6KHz)

* Adjustment Procedure

1) Connect the PATH JIG to PY03 after Test tape PLAYBACK

2) Insert the DP-2 TAPE. ( Auto playback )

3) Pressing the ATK OFF KEY.

4) Adjust the waveform of PB ENVE to maximum(figure1) using X-position VR.

5) Adjust IN/OUTPUT GUIDE until the exact waveform appear as bellow figure2.

-7-

ALIGNMENT INSTRUCTIONS

7-2. AUTO PG ADJUSTMENT

1) After adjustment of 7-1. Press the REC. button.

2) Eject the Test tape.

7-3. AZIMUTH ADJUSTMENT

1) Adjust point : AZIMUTH SCREW

Checking point : SOUND OUTPUT PY03)

Measuring Equipment : oscilloscope or audio level meter.

Mode : PLAYBACK

Test tape : DP-2 6KHz)

* Adjustment Procedure

1) Connect the measuring equipment to the AUDIO OUTPUT PY03) terminal.

2) After test tape playback, adjust the output level maximally by varing the azimuth screw.

3) Fix the azimuth screw with locking paint.

* If EEPROM I702) has been changed :

- Option data has to be changed and

- all alignment function has to be readjusted.

-8-

SERVICE REMOCON DIAGRAM

1. DIAGRAM

* To enter the SERVICE MODE

Press NORMAL => AV => SLEEP => CLEAR => POWER buttons in regular sequency within

10seconds using USER REMOCON after setting ST-BY.

-9-

SERVICE REMOCON

2. HOW TO CHEC TV SECTION WITHOUT VCR DEC

If you want to check TV section without DECK mechanism, then please perform in this order.

1) Pull out the power cord.

2) Remove the VCR DECK mechanism.

3) Supply the main power. Main sw on )

4) Wait for about 10 seconds. You can see the light of power LED if the TV is normal.)

5) Turn on the TV using the remocon. You can see the OSD "EMERGENCY" )

6) Check the TV section.

3. Refer to general adjustment

1) S-CORR +/- S-CORRECTION )

Press this button to adjust the same distance between horizontal lines on screen of crosshatch

pattern.

2) V-SLOPE +/- VERTICAL SLOPE )

Press this button to adjust the border line of blanked picture coincident with the center marks of the

pattern.

3) V-CENT +/- VERTICAL CENTER )

Press this button to adjust the center line of the pattern coincident with the mechanical center marks of

the CRT on screen of RETMA pattern.

4) V-SIZE +/- VERTICAL SIZE )

Press this button to adjust the upperside of the pattern coincident with the mechanical center marks

the CRT on screen of RETMA pattern.

5) H-CENT +/- HORIZONTAL CENTER )

Press this button to adjust picture centering with H-center on screen of RETMA pattern.

6) R,G,B +/- WHITE BALANCE )

The screen is become WHITE adjust R,G,B level by this button.

7) ATK OFF Auto tracking off )

Press this button to adjust X-Position adjustment.

Front panel’s LED’s are lighted up if you press this button.

Press the PB button.

ATK OFF : RED, RED)

ATK MIN : BLINK, OFF)

ATK MAX : OFF, BLINK)

ATK ON : BLINK,BLINK)

; LEFT LED = ST-BY, RIGHT LED = REC/T.REC

8) REC

Press this button to adjust AUTO PG.

9) SCREEN

Press this button to adjust the screen volume on FBT.

10) SHIP SHIPPING CONDITIONS )

Press this button to set the SHIPPING CONDITIONS.

11) REC-B Only 2-TUNER Model)

Press this button to adjust SUB TUNER AGC.

Press once : picture is displayed colour pattern.

Press once more : picture is displayed black/white pattern.

12) AGC +/-

this button to adjust MAIN TUNER AGC.

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