Sony FDL-PT222 User Manual
SERVICE MANUAL
MODEL COMMANDER DEST. CHASSIS NO.
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FDL-PT222 US
MODEL COMMANDER DEST. CHASSIS NO.
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MICROFILM
∗ Please file according to model size. .......
2.2
LCD COLOR TV
FDL-PT222
SPECIFICATIONS TABLE OF CONTENTS
Section Title Page
1. GENERAL
Power Sources (see fig. A) ...................................................... 3
Operation (see fig. B) .............................................................. 3
External Antenna Connection (see fig. C)............................... 4
WARNING .............................................................................. 4
2. DISASSEMBLY
2-1. Cabinets ........................................................................ 5
2-2. Service Position ............................................................ 6
3. CIRCUIT ADJUSTMENTS ............................................ 7
4. DIAGRAMS
4-1.Block Diagram (1)............................................................ 9
4-2.Block Diagram (2).......................................................... 11
4-3.Circuit Boards Location ................................................. 14
4-4.Printed Wiring Boards and Schematic Diagrams ........... 14
• T1 Board ..................................................................... 15
• A Board ....................................................................... 19
• B Board ....................................................................... 23
4-5.Semiconductors .............................................................. 27
5. EXPLODED VIEWS
5-1. Chassis Section .............................................................. 28
6. ELECTRICAL PARTS LIST........................................ 29
SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO THE METAL CHASSIS, CRT SHIELD, OR CARBON PAINTED ON THE CRT, AFTER REMOVING THE ANODE.
AN ISOLATION TRANSFORMER SHOULD BE USED DURING ANY SERVICE TO AVOID POSSIBLE SHOCK HAZARD, BECAUSE OF LIVE CHASSIS.
THE CHASSIS OF THIS RECElVER IS DIRECTLY CONNECTED TO THE
AC POWER LINE.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE
CRITICAL TO SAFE OPERATION. REPLACE THESECOMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN
THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. CIRCUIT
ADJUSTMENTS THAT ARE CRITICAL TO SAFEOPERATION ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE PROCEDURES WHENEVER CRITICAL COMPONENTS ARE REPLACED OR IMPROPER OPERA-
TION IS SUSPECTED.
(CAUTION)
WARNING!!
– 2 –
SECTION 1
GENERAL
The operating instructions mentioned here are partial abstracts from the
Operating Instructions Manual. The page numbers of the Operating
Instruction Manual remain as in the manual. (Part no : 4-083-376-11)
– 3 –
– 4 –
SECTION 2
DISASSEMBLY
2-1. CABINETS
1. Remove the battery cover 8.
2. Push two claws with a screwdriver or equivalent on the bottom and
remove them.
FDL-PT222
1 front cabinet
2 channel button
3 B board
claw
3. While pushing the rear cabinet, remove claws of joints with
the front cabinet.
4. Insert a screwdriver or equivalent to the gap on the upper side of the
cabinet, and while pushing the lock spring, put it down to the rear cabinet
side.
5. Remove the channel button 2.
6. Disconnect CN501 (for speaker) on the A board.
7. Remove the B board 3 and the A board 4.
8. Remove solder for the lead wire (BLK) 9.
9. Remove a screw (+PTP2X6) 6 secured the T board 5.
10. Release the T1 board 5 from two claws (right and left) on the rear cabinet.
front cabinet
rear cabinet
lock spring
6 screw (+PTP2X6)
9 lead wire (BLK)
4 A board
5 T1 board
claw
7 rear cabinet
8 battery cover
– 5 –
FDL-PT222
2-2. SERVICE POSITION
Cable for service
1-900-211-84
CN602
B board
CN301
AC power adaptor
J101
Mini-jack
CN601
A board
Cable for service
1-900-211-84
T1 board
CN201
Antenna
– 6 –
SECTION 3
CIRCUIT ADJUSTMENTS
FDL-PT222
3-1.A BOARD ADJUSTMENT [+4.5V ALIGNMENT (RV601)]
Using a digital voltmeter measuring the voltage between
JL32 (+4.5V) and JL33 (GND). Adjust RV601 to obtain
the value shown below.
Standard Value = 4.45V± 0.05VDC
S601 position = UHF position
[+30.0V CHECK]
Check the voltage across JL29 (+30.0V) and JL33 (GND) .
Standard Value = 30.5V±1.5VDC
[AUDIO OUTPUT CHECK]
1. Feed the audio signal 1kHz 100% modulated.
2. Set RV501 to maximum.
3. Connect an oscilloscope between JL23 (SP) and JL15 (SP
GND).
4. Check the waveform on the oscilloscope becomes the standard value.
Standard Value = 1.5V-2.8Vp-p
[VIF.AFT COARSE ADJUSTMNT (T201, T202)]
[SETUP]
1. Set S601 on the A board to VHF position.
2. Apply no signal to JL18 (RF).
3. Connect a 1 kΩ resistor between JL77 (+4.5V) and
JL28 (RF AGC).
4. Apply a sweep signal across JL26 (IF) and JL27(IF GND).
(Fig. 3-1)
Note : Set the sweep signal for JL26 to -30±5dBm. Keep the
distance to the ATT output JL26 as short as possible.
0.01µF
SWEEP
MARKER
GENERATOR
fo=45.75MHz±5kHz
ATT
JL26
75Ω 6dB
Fig. 3-1
3-2.T1 BOARD ADJUSTMENT
- T1 board - (Component side)
T201
T202
RV201
RV002
RV004
RV001
TU101
[ADJUSTMNT]
1. Connect an oscilloscope between JL72 (VIDEO) and JL71
(A.GND) and apply an external voltage (MGC) to JL26 to
obtain a waveform as shown in Fig. 3-2 (make sure not to
clip the extremely short portion).Adjust T202 so that the position at 45.75 MHz is the lowest point.
Note : Align JL51 (MGC) external voltage for approximately
a 1.0 Vp-p. Make sure that the JL51 (MGC) external
voltage does not exceed 4.3VDC.
2. Remove the external voltage (MGC) from JL51.
3. Connect an oscilloscope between JL31 (AFT) and JL30
(D.GND) and make a coarse adjustment of T201 so that wav eform is close to zero at the 45.75 MHz position.
4. Remove the 1 kilohm resistor connected between JL77 (+4.5V)
and JL28 (RF AGC).
1Vp-p
45.75MHz
– 7 –
0
Fig. 3-2
FDL-PT222
[AFT FINE ADJUSTMENT(T201)]
1. Connect a 1 kilohm resistor between JL77 (+4.5V) and JL28
(RF AGC).
Note : Perform this adjustment as the last step in the
process since drift may occur due to aging.
2. Switch the sweep signal to CW.
fo= 45.75 MHz±5 kHz, -30±5dBm
Apply the abov e signal between JL26 (IF) and JL27 (IF GND)
and then make a fine adjustment of T201 so that the level be-
tween JL31 (AFT) and JL30 (D.GND) reaches2.2V±0.4VDC.
3. Remove the 1 kilohm resistor connected between JL77 (+4.5V)
and JL28 (RF AGC).
[RF. AGC ADJUSTMENT (RV201)]
1. Set S601 to VHF position and recei ve a VHF color bar signal
issued from a signal generator.
2. Adjust RV201 and align the screen for the optimal point so
that the snow noise disappears.
[CHANNEL DISPLAY POSITION ADJUSTMENT
(RV001, RV002, RV004)]
1. Set S601 to VHF position, a potentiometer (47kΩ±15kΩ)
across JL25(CS) and JL77 (+4.5 V) as sho wn in Fig. 2-6 and
short the points JL21(CH CAL) and JL30 (D.GND).
2. Receive channel 2 and align the channel display positions with
RV002(VP).
3. Receive channel 13 and align the display bar with R V004(VA).
4. Align while performing tracking to mutual interference in the
above steps 2 and 3.
5. Receive channels 3 & 4 and confirm that the display bar is
within the standards.
6. Set S601 to UHF.
7. Receive channel 14 and align the display position with
RV001(UP).
8. Receive channel 69 and confirm that the display bar is within
the standards.
Once again receive channel 14 and confirm that the display
bar is within the standards.
Note : Use caution since shifting channel 69 will also
cause channel 14 to shift.
9. Remove the potentiometer (47kΩ+15kΩ) you connected between JL25(CS) and JL77(+4.5V). Also remov e the short you
connected between points JL21 (CH CAL)and JL30(D.GND).
JL25 (CS)
JL77(+4.5V)
Display bar
3-3.B BOARD ADJUSTMENT
- B board (Component side)
RV301
RV402
[CONTRAST ADJUSTMENT (RV402)]
1. Receive the stepped waveform signal in 10 steps.
2. Observe the waveform across JL83(G) and JL67(GND).
3. Check the contrast changes by turning RV402.
4. Connect an oscilloscope between JL84 (AUTO CB) and JL67
(D. GND) and adjust R V402 so that the v oltage of A portion
becomes 2.2+-0.2V.
5. Check the waveform as shown in Fig. 3-5.
6. At the same time, check the points C and D are within the
period as shown in Fig. 3-5.
100 IRE
JL83
0 IRE
JL84
C
A=2.2
±
Fig. 3-5
[COLOR PHASE (TINT) ADJUSTMENT (RV301)]
1. Receive the color bar signal from the signal generator.
2. Observe the waveform across JL81(B) and JL67(D.GND).
3. Adjust RV301 (TINT) so that the waveform level becomes as
shown in Fig. 3-6.
Contrast changes
D
0.2VDC
15kΩ
Fig. 3-3
Channel No.
6
VR(47kΩ)
*Channel No. and display
bar are to be in line.
Fig. 3-4
Fig. 3-6
– 8 –
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