Sony FDL-PT22/JE User manual

SERVICE MANUAL
MODEL COMMANDER DEST. CHASSIS NO. MODEL COMMANDER DEST. CHASSIS NO.
FDL-PT22 US
FDL-PT22/JE 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

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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.
A
a
22
22
2
11
11
1
AA(LR6) ×3
b
DC IN 4.5V
c
Power Sources (see fig. A)
Alkaline Batteries
Use Sony LR6 alkaline batteries (not supplied).
1 Push and slide the battery cover open.
2
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
2
B
a
b
Operation (see fig. B)
1 Set the OFF/VHF/UHF switch to VHF or UHF
whichever band you want to watch.
2 Press the CH +/– button to select a channel.
3 Adjust the volume with the VOL dial.
4 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 –
C
VHF UHF
e
d
c
b
a
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:
<Specification>
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:
<Specification>
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.
<Specification>
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
75
¶ 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
p
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.
6
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
C
D
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