Sony HCD-LX10AV / HCD-LX90AV / HCD-LX9AV / LBT-LX10AV / LBT-LX90AV / LBT-LX9AV Service Manual ▷ View online
17
Record Bias Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
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 1.
(After recording, press the m button without stopping will
return to the position where recording was started.)
When set to the test mode performed in Tape Speed Adjustment,
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 1.
(After recording, press the m button without stopping will
return to the position where recording was started.)
1.
Press FUNCTION button to select VIDEO 1. (This step is
not necessary if the above test mode has already been set.)
not necessary if the above test mode has already been set.)
2.
Insert a tape into deck B, press the
z REC button, and
then press the H button to start recording.
3.
Mode: Record
4.
Mode: Playback
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.
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
Record Level Adjustment (Deck B)
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
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 1.
(After recording, press the m button without stopping will
return to the position where recording was started.)
When set to the test mode performed in Tape Speed Adjustment,
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 1.
(After recording, press the m button without stopping will
return to the position where recording was started.)
1.
Press FUNCTION button to select VIDEO 1. (This step is
not necessary if the above test mode has already been set.)
not necessary if the above test mode has already been set.)
2.
Insert a tape into deck B, press the
z REC button, and
then press the H button to start recording.
3.
Mode: Record
4.
Mode: Playback
5.
Confirm playback the signal recorded in step 2 become
adjustment level as follows.
adjustment 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.
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
5.
Confirm playback the signal recorded in step 2 become
adjustment level as follows.
adjustment level as follows.
recorded
position
position
level meter
set
MD OUT
AF OSC
VIDEO 1 (AUDIO) IN
1) 315 Hz
2) 10 kHz
1) 315 Hz
2) 10 kHz
blank tape
CS-123
CS-123
set
attenuator
600
Ω
} 50 mV (–23.8 dB)
AF OSC
VIDEO 1 (AUDIO) IN
315Hz 50 mV (–23.8 dB)
315Hz 50 mV (–23.8 dB)
blank tape
CS-123
CS-123
set
attenuator
600
Ω
recorded
position
position
level meter
set
MD OUT
Record Level (Lch)
RV301
RV301
RV351
Record Level (Rch)
Record Level (Rch)
IC301 56
43 42
29
28
15
14
1
1
3
3
RV441 RV341
RV301(Lch),RV401(Rch)
Playback Level (Deck B)
Playback Level (Deck B)
RV301 RV401
RV341(Lch),RV441(Rch)
Record Bias
Record Bias
RV311(Lch),RV411(Rch)
Playback Level (Deck A)
Playback Level (Deck A)
RV311
RV411
Adjustment Location:
[AUDIO BOARD] (Conductor Side)
[AUDIO BOARD] (Conductor Side)
[MAIN BOARD] (Conductor Side)
18
CD SECTION
Note:
1.
1.
CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.
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
Ω 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.
when the signal level is low than specified value with the
following checks.
S Curve Check
Procedure :
1.
1.
Connect the oscilloscope to test points TP (FE) and TP (VC).
2.
Connect TP (FEI) and GND, and TP (AGCCON) and GND of
the BD board with lead wires.
the BD board with lead wires.
3.
Press the ?/1 button to turn the set ON.
4.
With the disc (YEDS-18) loaded, press the HX button and
perform focus search. (Focus search will be performed in the
same way even while the disc table is pushed in and out.)
perform focus search. (Focus search will be performed in the
same way even while the disc table is pushed in and out.)
5.
Check the symmetry and peak to peak level of the oscilloscope
waveform (S curve) at this time.
waveform (S curve) at this time.
S-curve waveform
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
brightness to obtain best waveform.
RF Level Check
Procedure :
1.
1.
Connect oscilloscope to test point TP (RF) and TP (VC) on
BD board.
BD board.
2.
Connect TP (AGCCON) and GND of the BD board with lead
wires.
wires.
3.
Press the ?/1 button to turn the set ON.
4.
Put disc (YEDS-18) in and playback 5 track.
5.
Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
signal level is correct or not.
6.
After check, remove the lead wire connected in step 2.
Adjustment Location :
[ BD BOARD ] — SIDE A —
Procedure:
1.
1.
Connect oscilloscope to test point TP (TE) on BD board.
2.
Press the ?/1 button to turn the unit ON.
3.
Put disc (YEDS-18) in to play the number five track.
4.
Press the HX 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:
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
• A/B x 100 = less then ± 22 (%)
• B = 1.3 ± 0.6 Vp-p
• B = 1.3 ± 0.6 Vp-p
1 track jump waveform
E-F Balance (1 Track Jump) check
oscilloscope
BD board
TP (FE)
TP (VC)
TP (VC)
+
–
–
symmetry
A
B
Within 4
± 1 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
+
–
–
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.45
± 0.25 Vp-p
0V
Center of the waveform
B
Symmetry
A (DC voitage)
level : 1.3
± 0.6 Vp-p
oscilloscope
BD board
TP (TE)
TP (VC)
TP (VC)
+
–
–
TP
(VC)
(VC)
TP
(RF)
(RF)
TP
(TE)
(TE)
TP
(FE1)
(FE1)
TP (FE)
TP
(AGCCON)
(AGCCON)
Note: Clear RF signal waveform means that the shape “
◊” can be
clearly distinguished at the center of the waveform.
RF signal waveform
19
SECTION 7
DIAGRAMS
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
(In addition to this, the necessary note is printed in each block)
Note on Printed Wiring Board:
• X : parts extracted from the component side.
•
• X : parts extracted from the component side.
•
f
: internal component.
• b : Pattern from the side which enables seeing.
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
• 2 : nonflammable resistor.
• 5 : fusible resistor.
• C : panel designation.
• 5 : fusible resistor.
• C : panel designation.
• U : B+ Line.
• V : B– Line.
• H : adjustment for repair.
• Voltages are taken with a VOM (Input impedance 10 M
• V : B– Line.
• H : adjustment for repair.
• Voltages are taken with a VOM (Input impedance 10 M
Ω).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: TUNER (FM/AM)
E
: PLAYBACK (DECK A)
d
: PLAYBACK (DECK B)
G
: RECORD
J
: CD PLAY (ANALOG OUT)
c
: CD PLAY (DIGITAL OUT)
N
: MIC INPUT
• Abbreviation
AUS
: Australian model
AR
: Argentine model
EA
: Saudi Arabia model
MY
: Malaysia model
MX
: Mexican model
SP
: Singapore model
• Indication of transisitor.
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
B
These are omitted.
C
E
Q
The components identified by mark 0 or dotted
line with mark 0 are critical for safety.
Replace only with part number specified.
line with mark 0 are critical for safety.
Replace only with part number specified.
20
7-1. CIRCUIT BOARDS LOCATION
PANEL FL board
TRANS board
SUB TRANS board
TUNER UNIT (FM/AM)
MAIN board
PA board
HEADPHONE board
TC-B board
CD-R board
FRONT INPUT board
CD-L board
TC-A board
MIC board
PANEL VR board
LEAF SW board
TABLE SENSOR board
BD board
AUDIO board
LED board
CD MOTOR board
SURROUND board
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