Sony FDL-PT22/JE Manuale utente

SERVICE MANUAL

MODEL COMMANDER DEST. CHASSIS NO. MODEL COMMANDER DEST. CHASSIS NO.

FDL-PT22

FDL-PT22/JE

∗Please file according to model size. ....

LCD COLORTV

2.2

– 2 –

TV standerd American TV standerd

Channel converage VHF : 2-13

UHF : 14-69

Antenna VHF/UHF strap antenna

Display format Transmission type TN liquid crystal

panel

Drive format Passive matrix

Picture 2.2 inches measured diagonally

Output Headphones : minijack

Impedance 8 - 45 ohms

Power requirements 4.5 V DC

Power consumption Approx : 2.9W

Speaker Ø28 mm (1 1/8 in.), 0.1 W

Temperature range 32 ˚F - 104 ˚F (0 ˚C - 40 ˚C)

Dimensions Approx. 91x109x64mm (w/h/d)

(3 5/8 x 4 3/8 x 2 5/8 in.) excl.

Projecting parts and controls

Strap length Approx. 1,300 mm (51 1/4 in.)

Mass Approx. 230 g (8.1 oz), excl. batteries

Design and specifications are subject to change without notice.

Optional accessories

AC power adaptor AC-E45HG / External antenna cord EAC-

39 /EAC-110/Size AA (LR6) alkaline battery

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BYSHADINGAND MARK ¡ON THE

SCHEMATIC DIAGRAMS, EXPLODED VIEWSAND IN THE PARTS

LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE

COMPONENTSWITHSONYPARTSWHOSEPARTNUMBERSAP-

PEARAS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

SPECIFICATIONS

– 3 –

Section Title Page Section Title Page

1. GENERAL ....................................................................... 4

2. DISASSEMBLY

2-1. Cabinet Removal ..................................................... 6

2-2. Service Position....................................................... 7

3. CIRCUIT ADJUSTMENTS

3-1. A Board Adjustment................................................ 8

3-2. T Board Adjustment ................................................ 8

3-3. B Board Adjustment ................................................ 9

4. DIAGRAMS

4-1. Block Diagram ........................................................ 11

4-2. Circuit Boards Location .......................................... 15

4-3. Printed Wiring Boards and Schematic Diagrams .... 15

•T Board .................................................................. 17

•A Board.................................................................. 21

•B Board.................................................................. 25

4-4. Semiconductors ....................................................... 29

5. EXPLODED VIEW

5-1. Chassis..................................................................... 30

6. ELECTRICAL PARTS LIST ...................................... 31

TABLE OF CONTENTS

– 4 –

SECTION1

GENERAL The operating instructions mentioned here are partial abstracts from the

Operating Instruction Manual. The page numbers of the Operating In-

struction Manual remein as in the manual.

AA(LR6) ×3

DC IN 4.5V

Power Sources (see fig. A)

Alkaline Batteries

Use Sony LR6 alkaline batteries (not supplied).

Push and slide the battery cover open.

Insert three batteries. Be sure to insert the (–) polarity

of each battery first as illustrated.

Battery Life: With continuous use, Sony LR6 alkaline

batteries will last about 3.0 hours.

Battery Type Size Battery Life

LR6 AA Approx. 3.0 hours

Note

When the picture becomes dim or the tuning does not lock

onto a channel, replace all the batteries with new ones.

House Current

See fig. A–b.

Note

Use only the recommended AC power adaptor, AC-E45HG

(not supplied). (For the polarity of the plug, see fig. A–

c).

to a wall outlet

Polarity of the plug

OFF/VHF/UHF

EXT ANT

CH +/–

VOL

BRT

Operation (see fig. B)

Set the OFF/VHF/UHF switch to VHF or UHF

whichever band you want to watch.

Press the CH +/– button to select a channel.

Adjust the volume with the VOL dial.

Adjust the brightness with the BRT dial.

To switch off the TV: Set the OFF/VHF/UHF switch to

OFF.

To improve the broadcast reception: Extend the strap

antenna and move the unit in every direction.

Note

If strong pressure or stress is applied to the antenna strap,

it automatically disconnects from the TV for safety.

Contact your nearest Sony dealer or authorized service

center for its repair.

There may be poor broadcast reception in the

following areas:

• Faraway from the broadcasting station, or behind a

mountain or tall building.

• Inside a train or car, etc.

• Where there strong interference, such as near a high

tension wire, neon sign, or radio station.

• Near a railway line or expressway, or under the air traffic

routes.

• In the underground shopping centers, tunnels, or solid

buildings.

Listening with headphones: Connect headphones (not

supplied) to the 2(headphones) jack. The sound is heard

from both sides of the headphones, but the sound is

monaural.

How to use the TV

Wear the TV around your neck. You can adjust the length

of the strap. (See fig. B–a).

You can also suspend or place the TV on a flat surface. (See

fig. B–b).

– 5 –

VHF UHF

aMixer

b75Ωcoaxial cable

cFeeder

dEAC-39 antenna cable (not

supplied)

eEAC-110 antenna cable (not

supplied)

External Antenna Connection

(see fig. C)

Connect an antenna cord EAC-39 (not supplied) or EAC-

110 (not supplied) to the TV. This will improve the TV’s

reception.

To EXT ANT

– 6 –

SECTION 2

DISASSEMBLY

2-1. CABINET REMOVAL

1Front cabinet

assy

2Channel

button 3B board

5T board

4A board

1Screw

(+P2 x 10)

7Rear cabinet assy

8Battery cover

Claw

1. Remove battery cover 8.

2. Push the two hooks in the lower section of the rear cabinet with

a pint and the like to undo them.

Hooks

3. While pressing the rear cabinet, undo hooks on the periphery.

4. Insert a pin into the upper side of the cabinet, and while push-

ing the hook, tilt the pin to the rear cabinet side.

5. Remove the channel button 2.

6. Remove the speaker cord from the connector.

7. Remove B board 3and A board 4.

8. Remove one screw 6(+P x 10) from T board 5.

9. Remove T board 5from the hooks (one each on both side) on

the rear cabinet.

Front cabinet

Rear cabinet

– 7 –

2-2. SERVICE POSITION

Service cord

1-900-211-84

B board CN301

CN601

CN602

A board

Service cord

1-900-211-84

T board

CN201

Antena

AC Power

adapter

AC-E45HG

Mini jack

J101

– 8 –

3-1. A BOARD ADJUSTMENT

+4.5V ADJUSTMENT

Measure the voltage between JL32 (4.5V) and JL33 (GND) with a

digital voltmeter, and adjust RV601 so that the voltage will be as

follows:

4.45 ±0.05VDC

S601: UHF position

CONFIRMATION OF +30V

Measure the voltage between JL29 (30V) and JL33 (GND) with a

digital voltmeter, and adjust RV601 so that the voltage will be as

follows:

30.5 ±1.5VDC

CONFIRMATION OF AUDIO OUTPUT

(1) Input 1kHz voice, 100% modulation from sound generator.

(2) Make RV501 MAX.

(3) Connect the probes of an oscilloscope to JL23 (SP) and JL15

(SP GND).

(4) Check the waveform on the oscilloscope, and make sure that it

is within the standard.

1.5 - 2.8Vp-p

SECTION 3

CIRCUIT ADJUSTMENT

3-2. T BOARD ADJUSTMENT

- T BOARD - (COMPONENT SIDE)

TU101

RV002

RV001

RV004

RV201

ROUGH ADJUSTMENT OF VIF.AFT

(1) Preparation

Set S601 in the VHF position.

Make JL18 (RF) signal-less

Insert 1kΩbetween JL77 (4.5V) and JL28 (RF AGC).

Input a sweep signal to the section between JL26 (IF) and JL27

(IF GND).

0.01µF

JL26

ATT

Sweep signal

6dBfo 45.75MHz

}

5kHz

Fig.3-1

Note: Thesweep signallevel shouldbe -30 ±5dBmat JL26.

The distance between the ATT output and JL26

should be as short as possible.

(2) Insert the output between JL72 (VIDEO) and JL71 (A.GND)

to an oscilloscope, and apply external voltage (MGC) to JL51

so that the waveform shown in Fig.3-2 will appear (the mini-

mum section should not clip). AdjustT202 so that the position

of 45.75MHz will be the lowest.

Note: This portion should be approx. 1.0Vp-p when exter-

nal voltage is applied to JL51 (MGC).

The external voltage applied to JL51 (MGC) should

not exceed 4.3VDC.

– 9 –

RF.AGC ADJUSTMENT

(1) Input the VHF color bar signal from the test signal generator.

(2) Adjust RV201 to optimum position so that there is no snow

noise on the screen.

CHANNEL DISPLAY POSITION ADJUSTMENT

(1) Set S601 in the VHF position.

Insert resistors (47kΩ+ 15kΩ) between JL25 and JL77 (4.5V

line), and short circuit JL21 and JL30 (D.GND).

(2) Receive 2ch, and adjust the channel display position with

RV002.

(3) Receive 13ch, and adjust the display bar with RV004.

(4) Carry out tracking, because (2) and (3) interfere with each other.

(5) Receive 6 and 7ch, and check that the display bar conforms to

the standard.

(6) Set S601 in the UHF position.

(7) Receive 14ch and adjust the display position with RV001.

(8) Receive 40ch and 69ch, and check that the display bar con-

forms to the standard.

(9) Remove resistors from JL25 and JL77, and open the short cir-

cuit between JL21 and JL30

Approx. 1.0V

45.75MHz

Fig.3-2

(3) Remove the external voltage (MGC) from JL51.

(4) Connect the output between JL31 (AFT) and JL30 (D.GND) to

an oscilloscope, and roughly adjust T201 so that the position

of 45.75MHz will be a zero cross.

(5) Remove 1kΩfrom the section between JL77 (4.5V) and JL28

(RF AGC).

AFT ADJUSTMENT

(1) Insert 1kΩbetween JL77 (4.5V) and JL28 (RF AGC).

Note: Because of drifting due to aging, adjustment should

be made at the end of the process.

(2) Switch the sweep signal to CW.

fo = 45.75MHz ±5kHz

Input the above signal to the section between JL26 (IF) and

JL27 (IF GND), and finely adjust T201 so that the level be-

tween JL31 (AFT) and JL30 (D.GND) will be 2.2 ±0.4VDC.

(3) Remove 1kΩfrom the section between JL77 (4.5V) and JL28

(RF AGC).

Display bar

Channel No.

JL77

JL25

47K

15K

*Channel No. and display ber are to be in line.

Fig.3-3

– 10 –

3-3. B BOARD ADJUSTMENT

- B BOARD - (COMPONENT SIDE)

RV402

RV301

GRADATION ADJUSTMENT

(1) Input a 10-step staircase signal from the test signal generator.

(2) Connect an oscilloscope probe between JL83 (G) and JL67 (D.

GND) and observe the waveform.

(3) The contrast should change when RV402 is turned.

(4) Connect the oscilloscope prove between JL84 (AUTO CB) and

JL67 (D. GND), and observe the waveform. Adjust RV402 so

that voltage A is 2.2±0.2V

(5) Check that the waveform between JL84 and JL67 is as shown

in Fig.3-4.

(6) Check to see that the phases C and D are within the range speci-

fied (↔).

JL83

JL84

0 IRE

100 IRE

A = 2.2 ±0.2V

Picture contrast

is varies.

Fig.3-4

HUE ADJUSTMENT

(1) Receive a color bar.

(2) Insert an oscilloscope between JL81 (B) and JL67 (D.GND).

(3) Arrange RV301 as shown in Fig.3-5.

Fig.3-5

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