Sony HCD-LV100AV / LBT-LV100AV 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.)
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.
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.)
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
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.
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
+
–
–
BD board
TP (FE)
TP (VC)
TP (VC)
oscilloscope
A
B
symmetry
within 4
± 1 Vp-p
+
–
–
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.45
1.45
± 0.3 Vp-p
E-F Balance (1 Track Jump) Check
Procedure :
1.
1.
Connect oscilloscpe to TP (TE) and TP (VC).
2.
Turn the power ON.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the
^ (CD) button. (Becomes the 1 track jump mode)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
waveform.
1 track jump waveform
Specified level:
× 100 = less than ± 22%
6.
After check, remove the lead wire connected in step 1.
Checking Location:
– BD BOARD (Side B) –
A
B
B
+
–
–
BD board
TP (TE)
TP (VC)
TP (VC)
oscilloscope
A (DC voltage)
center of
waveform
waveform
B
0V
level = 1.3
± 0.6 Vp-p
symmetry
TP (AGCCON)
TP (RF)
TP (GND)
TP (FE)
IC103
IC102
IC101
TP (FE1)
TP (VC)
TP (TE)
Note:
1. CD Block is basically designed to operate without adjustment. There-
1. CD Block is basically designed to operate without adjustment. There-
fore, 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 10 M
3. Use an oscilloscope with more than 10 M
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.
S-Curve Check
Procedure:
1.
1.
Connect oscilloscope to TP (FE).
2.
Connect between TP (FE1) and TP (VC) by lead wire.
3.
Connect between TP (AGCCON) and TP (GND) by lead wire.
4.
Turn the power ON.
5.
Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
consequence of open and close the disc tray, actuate the focus
search)
6.
Cofirm that the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within
4 ± 1 Vp-p.
between A and B. And confirm peak to peak level within
4 ± 1 Vp-p.
S-curve waveform
7.
After check, remove the lead wire connected in step 2 and 3.
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 TP (RF).
2.
Connect between TP (AGCCON) and TP (GND) by lead wire.
3.
Turn the power ON.
4.
Load a disc (YEDS-18) and press the
^ button to play.
5.
Confirm that the 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.
Note: Clear RF signal waveform means that the shape “≈” can be clearly
distinguished at the center of the waveform.
19
19
VIDEO SECTION
Frequency Adjustment
Connection:
Procedure:
1. Connect the frequency counter to TP508 (27 MHz) on VIDEO
1. Connect the frequency counter to TP508 (27 MHz) on VIDEO
board.
2. Turned power switch on.
3. Press the
3. Press the
[FUNCTION]
button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency counter
reading 27.0 MHz ± 80 Hz at stop status.
Adjustment Location:
– VIDEO Board (Side A) –
+
–
–
TP508 (27 MHz)
VIDEO board
frequency counter
IC505
IC507
TP508
(27 MHz)
CT503
VIDEO
Frequency
Adjustment
20
20
SECTION 6
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.
•
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.
•
U
: B+ Line.
•
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
EA
: Saudi Arabia model.
SP
: Singapore model.
MY : Malaysia model.
IA
IA
: Indonesian 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.
6-1. CIRCUIT BOARDS LOCATION
PANEL FL board
TRANS board
TUNER UNIT (FM/AM)
MAIN board
PA
VIDEO board
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 AMP board
CD-L2 board
CD-R2 board
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