Sony HCD-N455KW / LBT-N455KRW Service Manual ▷ View online
— 13 —
CD SECTION
Note:
1. CD Block is basically constructed 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 impedance.
4. Clean the object lens by an applicator with neutral detergent when
3. Use an oscilloscope with more than 10M impedance.
4. Clean the object lens by an applicator 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
Procedure:
1. Connect oscilloscope to test point TP (RF).
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Adjust RV101 so that the waveform is clear.
1. Connect oscilloscope to test point TP (RF).
2. Turned Power switch on.
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
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
level: 1.3 ± 0.3 Vp-p
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 be-
tween A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.
Vp-p.
S-curve waveform
S Curve Check
6. After check, remove the lead wire connected in step 2.
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 bright-
ness 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 oscilloscope 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 oscilloscope 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
level: 1.3 ± 0.3 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
A
B
within 2.4 ± 0.7 Vp-p
symmetry
oscilloscope
BD board
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
TP (FEO)
TP (VC)
TP (VC)
— 14 —
E-F Balance Check
Procedure:
1. Connect test point TP703 (ADJ2) on Main board to Ground with
1. Connect test point TP703 (ADJ2) on Main board to Ground with
a lead wire.
2. Connect oscilloscpe 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)
A
B
level: 300 ± 100 mVp-p
0V
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
Adjustment Location:
[BD BOARD] — Component Side —
IC104
IC101
IC102
RF
RV101
RV103
TEO
FEO
FOK
TEI
FEI
RV102
VC
PCK
GND
[MAIN BOARD] — Conductor Side —
IC701
TP703
(ADJ2)
(ADJ2)
— 23 —
AUDIO board
(including
(including
p
A)
BD board
p
A
MOTOR board
LEAF SWITCH board
TABLE SENSOR board
CD MOTOR board
LED board
HP board
MIC board
CD-L board
TC CONTROL board
DOOR-SW board
CD-JOG board
CD-R board
TC SW board
POWER AMPLIFIER board
ST SW board
MAIN board
KEY CON board
TCB board
SP TERMINAL board
TRANS board
PANEL board
6-2. CIRCUIT BOARDS LOCATION
Note:
pA is including in AUDIO board.
SECTION 6
DIAGRAMS
HCD-N455KW
6-1. BLOCK DIAGRAMS
—TUNER SECTION—
—TUNER SECTION—
TM1
ANTENNA
ANT IN
ST +10V
Q5
F OUT
VT
FE1
FM FRONT END
IF OUT
CF1
10.7MHz
IF AMP
Q1, 2
IF AMP
Q3, 4
CF2
10.7MHz
1 FM IN
4
29
REG
AM OSC
FM/AM MPX
IC2
B+
RF OUT
27 AM RF IN
ANT IN
VT
19
15
10
09
FM OSC
PD1
FM
PLL
IC1
15 11
30
14
2
12
14
7
8
13
X43
450kHz
FM SD
AM/FM
VCO STOP
IF BUFF
AM
SD
AM
TUNED
LEVEL
12
RV42
2
AM IF
IFT41
IFT41
5
9
23
AM IF
DET
VCO
ST LED
TU LED
8
7
X41
456kHz
X42
10.7MHz
MUTE
STEREO
TUNED
24
22
AM/FM
MPX IN
20
OUT L
18 AMP IN L
L 16
ST L
4
5
3
6
ST CE
COM DIN
COM CLK
COM CLK
COM DATA
A
MAIN
SECTION
AM OSC
FM
VCO STOP
IF
IF REQ
X IN
X OUT
CE
DI
CL
DO
1 24
X21
4.5MHz
FE2
AM FRONT END
AM MIX
AM
SD
F OUT
FM 75
Ω
21
OUT R
R-CH
AM
FM
TUNED
LEVEL
RV41
3
7
9
13
14
• R-CH: Same as L-CH
• SIGNAL PATH
• SIGNAL PATH
: FM
: AM
(Page 21)
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