Sony HCD-N455K / LBT-N455K Service Manual ▷ View online
— 13 —
SW OSC Voltage Adjustment
(EA, JE model)
(EA, JE model)
Setting:
Band: SW
Band: SW
Procedure:
1. Connect digital Voltmeter to diode D1 center lead and ground.
2. Adjust for a following value reading on digital voltmeter.
1. Connect digital Voltmeter to diode D1 center lead and ground.
2. Adjust for a following value reading on digital voltmeter.
1.2
±
0.1 V
8.5
±
0.2 V
SW Tracking Adjustment
(EA, JE model)
(EA, JE model)
Setting:
Band: SW
Band: SW
Procedure:
Adjust for maximum reading on level meter.
Adjust for maximum reading on level meter.
T1
CV1
SW
• Repeat the procedures is each adjustment several times, and the
frequency coverage and tracking adjustment should be finally done
by the trimmer capacitors.
by the trimmer capacitors.
Adjustment Location
[TCB BOARD] — Component Side —
• Abbreviation
EA
: Saudi Arabia model
JE
: Tourist model
set
SPEAKER terminal
CV2
CV1
T2
CV1, T1
SW Tracking
Adjustment
SW Tracking
Adjustment
level meter
AM RF SSG
30% amplitude
modulation by
400Hz signal
modulation by
400Hz signal
AM ANTENNA terminal
RV42
D1, CV2, T2
SW OSC Voltage
Adjustment
SW OSC Voltage
Adjustment
D1
IC41
frequency
Adjustment
part
Reading on
digital
voltmeter
5.95 MHz
17.9 MHz
SW
Set frequency
Adjustment
part
T2
CV2
7 MHz
17 MHz
TM1
T1
RV41
— 14 —
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicatior with neutral detergent when
the signal level is low than specified value with the following
checks.
checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
S Curve Check
6. After check, remove the lead wire connected in step 2.
Note :
Note :
• Try to measure several times to make sure than the ratio of
A : B or B :A is more than 10 :7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
RF Level Check
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that osilloscope waveform is clear and check RF signal
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that osilloscope waveform is clear and check RF signal
level is correct or not.
Note : Clear RF signal waveform means that the shape “
◊
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500nS
TIME/DIV : 500nS
Procedure :
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and Ground by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc table
is moving in and out.)
is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2.4
±
0.7
Vp-p.
S-curve waveform
level : 1.3
±
0.3 Vp-p
Symmetry
within 2.4
±
0.7 Vp-p
A
B
oscilloscope
oscilloscope
(DC range)
(DC range)
BD board
TP(RF)
TP(VC)
Procedure :
1. Connect oscilloscope to test point TP (RF).
1. Connect oscilloscope to test point TP (RF).
(Ground terminal : VC)
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
(Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.)
5. After adjustment, check the RF signal level.
• RF signal
VOLT/DIV : 200 mV
TIME/DIV : 500 nS
TIME/DIV : 500 nS
level
1.3
1.3
±
0.3 Vp-p
TP(FE)
TP(VC)
BD board
BD board
TP(RF)
TP(VC)
oscilloscope
— 15 —
E-F Balance Check
Procedure :
1. Connect test point TP703 (ADJ 2) on Main board to Ground with
1. Connect test point TP703 (ADJ 2) on Main board to Ground with
a lead wire.
2. Connect oscilloscope to test point TP (TEO).
3. Turned Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the
3. Turned Power switch on.
4. Put disc (YEDS-18) in and playback.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0Vdc, and check this level.
Traverse waveform
Specified level : •
X
100=less than
±
7%
• A+B=300
±
100 mVp-p
6. Remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
There is no problem.
Therfore, do not perform this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
A-B
2(A+B)
Adjustment Location
[BD BOARD] (Conductor Side)
RF
FOK
RV101
RV103
IC101
IC102
TEI
FEI
TEO
RV102
VC
GND
PCK
FEO
TP(TEO)
TP(VC)
0V
level : 300
±
100 mVp-p
B
A
IC104
[MAIN BOARD] (Conductor Side)
IC701
oscilloscope
BD board
TP703
(ADJ2)
(ADJ2)
— 16 —
SECTION 5
DIAGRAMS
5-1. CIRCUIT BOARDS LOCATION
HP board
CD LED board
CD (L) board
TC CONTROL board
DOOR SW board
CD JOG board
CD (R) board
TC SW board
POWER AMP board
MAIN board
KEY CON board
TCB board
TRANS board
PANEL board
MIC board
Note:
pA is including in MD board.
p
A
MOTOR board
LEAF SWITCH board
TABLE SENSOR board
CD MOTOR board
LED board
BD board
MD board
(including
(including
p
A)
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