Sony HCD-XB8K / LBT-XB8AVK / LBT-XB8AVKS Service Manual ▷ View online
— 13 —
Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in
When set to the test mode performed in
Tape Speed Adjust-
ment
,
when the tape is rewound after recording, the “REC memory
mode” which rewinds only the recorded portion and playback is
set.
This “REC memory mode” is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will auto-
matically switch to VIDEO.
set.
This “REC memory mode” is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will auto-
matically switch to VIDEO.
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Load a tape into deck B, and press the
r REC button.
3. Mode: Record
set
VIDEO (AUDIO) IN
1) 315Hz
2) 10kHz
1) 315Hz
2) 10kHz
} 50 mV (–23.8 dB)
AF OSC
attenuator
600
Ω
blank tape
CS-123
CS-123
4. Mode: Playback
recorded
position
position
main board
CN403 Pin
CN403 Pin
3
(L-CH)
Pin
1
(R-CH)
set
level meter
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If these levels do not adjustment level, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 3
and 4.
If these levels do not adjustment level, adjust the RV341 (L-
CH) and RV441 (R-CH) on the AUDIO board to repeat steps 3
and 4.
Adjustment level: The playback output of 10 kHz level difference
against 315 Hz reference should be ± 1.0 dB.
Adjustment Location: AUDIO board
RV341(Lch),RV441(Rch)
Record Bias
Record Bias
RV301
RV401
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
Playback Level (Deck B)
RV651 (Normal Speed)
RV652 (High Speed)
Tape Speed
RV652 (High Speed)
Tape Speed
RV652
RV651
RV311
RV411
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
Playback Level (Deck A)
Record Level Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in
When set to the test mode performed in
Tape Speed Adjust-
ment
, when the tape is rewound after recording, the “REC memory
mode” which rewinds only the recorded portion and playback is
set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
set.
This “REC memory mode” is convenient for performing this
adjustment. During recording, the input signal FUNCTION will
automatically switch to VIDEO.
1. Press FUNCTION button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Load a tape into deck B, and press the
r REC button.
3. Mode: Record
VIDEO (AUDIO) IN
315 Hz 50 mV (–23.8 dB)
315 Hz 50 mV (–23.8 dB)
set
blank tape
CS-123
CS-123
600
Ω
attenuator
AF OSC
4. Mode: Playback
level meter
set
main board
CN403 Pin
CN403 Pin
3
(L-CH)
Pin
1
(R-CH)
recorded
position
position
5. Confirm playback the signal recorded in step 2 become adjust-
ment level as follows.
If these levels do not adjustment level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 3
and 4.
If these levels do not adjustment level, adjust the RV301 (L-
CH) and RV351 (R-CH) on the MAIN board to repeat steps 3
and 4.
Adjustment level:
CN403 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
CN403 playback level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
Adjustment Location
[AUDIO BOARD] (Conductor Side)
[AUDIO BOARD] (Conductor Side)
RV301
Record Level (L CH)
Record Level (L CH)
IC401
RV351
Record Level
(R CH)
Record Level
(R CH)
CN403
1
3
[MAIN BOARD] (Component Side)
— 14 —
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.
S Curve Check
oscilloscope
BD board
TP (FEO)
TP (VC)
TP (VC)
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.)
table 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 3 ± 1Vp-p.
S-curve waveform
A
B
within 3 ± 1 Vp-p
symmetry
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
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
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 sig-
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 sig-
nal 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: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
level: 1.3 ± 0.3 Vp-p
E-F Balance (1 Track Jump) check
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
• x 100 = less then ± 7 (%)
• A + B = 500 ± 100 mVp-p
A – B
2 (A + B)
1 track jump waveform
0V
Center of the waveform
B
A (DC voitage)
Symmetry
level : 500 mV ± 100 mVp-p
Adjustment Location:
[BD BOARD] (Conductor Side)
TP (RF)
TP
(FOK)
(FOK)
TP
(VC)
IC101
TP
(TEO)
(TEO)
TP
(FEO)
(FEO)
TP
(GND)
(GND)
IC103
IC102
CN101
IC102
Procedure:
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
P (Pause)” button.
5. Check the level B of the oscilloscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following:
Confirm the following:
— 15 —
— 16 —
SECTION 6
DIAGRAMS
PANEL board
TRANS board
SURROUND board
MAIN board
POWER board
CD-B1 SW board
CD-B2 SW board
TC-B SW board
DOOR SW board
CD-LED board
TC-A SW board
HP/MIC board
LEAF SWITCH board
BD board
LED board
CD MOTOR board
TABLE SENSOR board
CD-A SW board
AUDIO board
(including
(including
p
A)
p
A
MOTOR board
Note:
pA is including in AUDIO board.
6-1. CIRCUIT BOARDS LOCATION
FM/AM TUNER PACK
KEY CON board
6-2. BLOCK DIAGRAMS
— KEY CON SECTION —
HCD-XB8K
J761
MIC LEVEL
RV760
MIC 1
3
1
J762
MIC 2
IC1403
6
7
1
2
9
8
5
3
4
9 10 11
Q1401
7 8 9
L OUT
A
MAIN
SECTION
• R CH : Same as Lch
• Signal path
: FM
: MIC
• Signal path
: FM
: MIC
(Page 21)
22
15
MIX
OUT
LPF1
IN
Rch
DATA
CLK
LATCH
K CON
L IN
DATA
CLOCK
STORBE
KEY CONTROL
IC1401
SWITCH
ECHO LEVEL
RV761
IC761
ECHO
LPF1
LPF2
IC760 (2/2)
ECHO AMP
IC760 (1/2)
MIC AMP
09
— 17 —
— 18 —
HCD-XB8K
— CD SECTION —
• R CH: Same as L ch
• SIGNAL PATH
: CD
• SIGNAL PATH
: CD
M
OPTICAL PICK-UP BLOCK
DETECTOR
K
B+
A
D
C
B
E
F
A
D
C
B
1
4
2
5
5
10
6
38
39
41
42
2
1
45
47
LD DRIVE
Q101
36
37
LD
PD
XRST
FOK
23
27
FOCUS/TRACKING SERVO.
RF AMP
IC101 (1/2)
6
7
12
13
20
22
21
26
25
24
33
19
44
14
15
PD1
PD2
F
E
FEI
FEO
TEO
TEI
CLK
XLT
DATA
TA O
TA M
FE M
FE O
SENS2
SENS1
C.OUT
LOCK
RF O
27 23
15 16 17
10 11 12
75 8
7 9
100
93
86
89 • 90
X101
16.9344MHz
XTAI
•
XTAO
LOUT1
LOUT2
XRST
SCOR
SQSO
SQCK
SENS
DATA
XLAT
CLOK
DIGITAL SIGNAL PROCESSOR
IC103
RF
29 LOCK
CNIN
SEIN
SEIN
DATAO
XLTO
CLKO
MDP
FOK
21
S101
LIMIT
SPOD
9
LASER
DIODE
TRACKING
COIL DRIVE
27
15
16
FOCUS/TRACKING
COIL DRIVE
IC102 (1/2)
FOCUS
COIL DRIVE
26
18
17
2-AXIS
DEVICE
TRACKING
COIL
FOCUS
COIL
T+
F+
T–
F –
SLED
SERVO
IC101 (2/2)
SLED/SPINDLE
MOTOR DRIVE
IC102 (2/2)
14
16
6
SLED MOTOR
DRIVE
11
•
12
M
M102
SLED MOTOR
SPINDLE MOTOR
DRIVE
3
13
•
14
M
M101
SPINDLE
MOTOR
SL O
SL P
CD CLK
CD DATA
SENS2
SCOR
SQ DATA
SQ DATA
SQ CLK
SENS
XRST
XLAT
S201
UP SW
09
L-CH
R-CH
C
MAIN
SECTION
MUTE
7
3
9
1
M201
TABLE
MOTOR
OUT1
OUT2
IN1
IN2
MOTOR DRIVER
IC201
TBL.L
TBL.R
UP SW
(Page 21)
DISC
TABLE
SENSOR
IC202
T.SENS
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