Sony HCD-V909AV / MHC-V909AV Service Manual ▷ View online
— 13 —
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location: Playback Head (Deck A)
Record/Playback/Erase Head (Deck B)
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw so
that outputs match within 1 dB of peak.
that outputs match within 1 dB of peak.
3. Mode: Playback
Tape Speed Adjustment (Deck A)
Note: Set the test mode using the following method and begin tape
speed adjustment.
In the test mode, the tape will move at double speed while
the HIGH SPEED DUBBING button is pressed.
In the test mode, the tape will move at double speed while
the HIGH SPEED DUBBING button is pressed.
Procedure :
With the power turned ON, press the NEXT button, ENTER/
NEXT button, and EFFECT ON/OFF button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the POWER button.
With the power turned ON, press the NEXT button, ENTER/
NEXT button, and EFFECT ON/OFF button simultaneously.
(The “VOLUME” on the fluorescent display tube will blink while
in the test mode.)
To exit the test mode, press the POWER button.
1. Load WS-48B into deck A and a recordable tape into deck B.
2. Press the
2. Press the
r REC button, and press the · button of deck B to
set deck B into the recording state.
3. Play deck A.
4. While pressing the HIGH SPEED DUBBING button, set double
4. While pressing the HIGH SPEED DUBBING button, set double
speed play.
5. Adjust RV652 of the AUDIO board so that the reading of the
frequency counter becomes 6000 ± 90 Hz.
6. Release the HIGH SPEED DUBBING button to set normal
speed play.
7. Adjust RV651 of the AUDIO board so that the reading of the
frequency counter becomes 3000 ± 90 Hz.
Adjustment Location: AUDIO board
Sample Value of Wow and flutter
W.RMS (JIS) less than 0.3%
(test tape: WS-48B)
(test tape: WS-48B)
Playback Level Adjustment (Deck A, Deck B)
Procedure:
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
output
level
level
within
1 dB
1 dB
L-CH
peak
peak
R-CH
peak
peak
screw
position
position
within 1dB
test tape
P-4-A100
(10kHz, –10dB)
P-4-A100
(10kHz, –10dB)
VIDEO/MD
(AUDIO) OUT
(AUDIO) OUT
oscilloscope
GND
set
L
R
Waveform of oscilloscope
in phase
45
°
90
°
135
°
180
°
good
wrong
reverse
forward
test tape
P-4-L300
(315Hz, 0dB)
P-4-L300
(315Hz, 0dB)
VIDEO/MD
(AUDIO) OUT
(AUDIO) OUT
level meter
set
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Deck A is RV311 (L-CH) and RV411 (R-CH), deck B is RV301
(L-CH) and RV401 (R-CH)
so that adjustment within the following adjustment level.
Adjustment level:
J101 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
J101 playback level: 301.5 to 338.3 mV (–8.2 to –7.2 dB)
level difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
— 14 —
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
4. Mode: Playback
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
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
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)
[MAIN BOARD] (Component Side)
4. Mode: Playback
AF OSC
VIDEO/MD (AUDIO) IN
1) 315Hz
2) 10kHz
1) 315Hz
2) 10kHz
blank tape
CS-123
CS-123
set
attenuator
600
Ω
} 50 mV (–23.8 dB)
AF OSC
VIDEO/MD (AUDIO) IN
315Hz 50 mV (–23.8 dB)
315Hz 50 mV (–23.8 dB)
blank tape
CS-123
CS-123
set
attenuator
600
Ω
RV341 (Lch), RV441 (Rch)
Record Bias
Record Bias
RV301
RV401
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
RV651 RV652
RV311
RV411
RV311 (Lch), RV441 (Rch)
Playback Level (Deck A)
Playback Level (Deck A)
RV441 RV341
RV301
Record Level (L CH)
Record Level (L CH)
IC401
RV351
Record Level
(R CH)
Record Level
(R CH)
recorded
position
position
VIDEO/MD
(AUDIO) OUT
(AUDIO) OUT
level meter
set
recorded
position
position
VIDEO/MD
(AUDIO) OUT
(AUDIO) OUT
level meter
set
— 15 —
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 applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
checks.
S Curve Check
Note : A clear RF signal waveform means that the shape “
◊
” can
be clearly distinguished at the center of the waveform.
RF signal waveform
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turned 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±1 Vp-p.
And confirm peak to peak level within 3±1 Vp-p.
S-curve waveform
oscilloscope
BD board
TP (FE)
TP (VC)
TP (VC)
+
–
–
symmetry
A
B
Within 3
±
1 Vp-p
6. After check, remove the lead wire connected in step 2.
Note : • Try to measure several times to make sure than the ratio
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 to play the number five track.
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 to play the number five track.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.3 Vp-p
+0.25
–0.20
–0.20
E-F Balance (1 Track Jump) check (Without remote com-
mander)
mander)
Procedure:
1. Connect oscilloscope to test point TP (TE) on BD board.
2. Turned Power switch on. Press FUNCTION button to select
1. Connect oscilloscope to test point TP (TE) on BD board.
2. Turned Power switch on. Press FUNCTION button to select
CD.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the “
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:
• A/B x 100 = less then ± 22 (%)
1 track jump waveform
E-F Balance (Traverse) Check (With remote commander)
oscilloscope
BD board
TP (TE)
TP (VC)
TP (VC)
+
–
–
Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Connect the lead wire to both ends of the land of SL702 (ADJ)
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Connect the lead wire to both ends of the land of SL702 (ADJ)
and SL703 (AFADJ) of the VIDEO board.
3. Turned Power switch on. Press FUNCTION button to select
CD.
4. Short the lead wire.
5. Put disc (YEDS-18) in to play the number five track.
6. Press the REPEAT button. (The tracking servo and the sled-
5. Put disc (YEDS-18) in to play the number five track.
6. Press the REPEAT button. (The tracking servo and the sled-
ding servo are turned OFF.)
oscilloscope
BD board
TP (TE)
TP (VC)
TP (VC)
+
–
–
0V
level : 1.3
±
0.6 Vp-p
A (DC voltage)
Center of the waveform
B
Symmetry
— 16 —
7. Check the level B of the oscilliscope's waveform and the A (DC
voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Confirm the following :
A/B x 100 = less than ± 22%
Traverse waveform
Adjustment Location :
[ BD BOARD ] — SIDE A —
[ VIDEO BOARD ] — SIDE B —
1
20
10
11
IC103
(RF)
(FE)
(FEI)
(TE)
(VC)
IC101
(PLCK)
8. Press the REPEAT button. (The tracking servo and sledding
servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 7.
equal to the A (DC voltage) is step 7.
Traverse waveform
0V
C (DC
voltage)
voltage)
Tracking servo
Sled servo
OFF
Sled servo
OFF
Tracking servo
Sled servo
ON
Sled servo
ON
0V
level : 1.3
±
0.6 Vp-p
A (DC voltage)
Center of the waveform
B
9. Remove the lead wire connected step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to TP (PLCK) with lead wire.
1. Connect frequency counter to TP (PLCK) with lead wire.
2. Turned Power switch on.
3. Put the disc (YEDS-18) in to play the number five track.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
BD board
frequency counter
TP (PLCK)
+
–
–
VIDEO SECTION
Frequency adjustment
1. Connect the frequency counter to check point of the VIDEO
board.
2. Adjust CT401 of the VIDEO board so that the frequency counter
read 13.5MHz ± 40Hz at STOP condition.
SL703 (AFADJ)
IC751
IC251
SL702 (ADJ)
SL701 (CAL BAR)
CT401
Frequency
TP410 (DCLK)
frequency counter
VIDEO board
TP410 (DCLK)
TP410 (DCLK)
+
–
–
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