Sony HCD-GRX9000 / HCD-RX900 / MHC-GRX9000 / MHC-RX900 Service Manual ▷ View online
– 17 –
FM Polar Adjustment
Connection 1:
Connection 2:
Adjustment Location :
[TCB BOARD] (Component Side)
Procedure :
1. Set the modulation of FM RF SSG to AUDIO 1 kHz, 10 kHz
deviation according to “Connection 1”.
2. Tune the set to 69 MHz.
3. Adjust the RV1702 so that the reading of frequency counter
3. Adjust the RV1702 so that the reading of frequency counter
connected to TP1702 becomes within 31.25 kHz ± 0.05 kHz.
(VCO Adjustment)
(VCO Adjustment)
4. Then record the reading of the level meter connected to TP1701
5. Set the modulation of FM RF SSG to AUDIO 31.25 kHz, 10
5. Set the modulation of FM RF SSG to AUDIO 31.25 kHz, 10
kHz deviation according to “Connection 2”.
6. Tune the set to 69 MHz.
7. Set the CT1701 to be mechanical center.
8. Adjust the L1701 so that the reading of the level meter con-
7. Set the CT1701 to be mechanical center.
8. Adjust the L1701 so that the reading of the level meter con-
nected to TP1701 become maximum.
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 becomes maximum. (SUB CARRIER
PEAK Adjustment)
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 becomes maximum. (SUB CARRIER
PEAK Adjustment)
9. Adjust the RV1701 so that the level at the moment becomes
14dB higher value than the level recorded in step 4. (SUB CAR-
RIER LEVEL Adjustment)
RIER LEVEL Adjustment)
[TCB BOARD] (Conductor Side)
FM ANTENNA terminal
(75
(75
Ω
)
75
Ω
coaxial
set
FM RF SSG
Carrier frequency : 69 MHz
Output level
Output level
: 1mV (60dB
µ
) (at 75
Ω
open)
Modulation
: AUDIO 1 kHz, 10kHz deviation
FM ANTENNA terminal
(75
(75
Ω
)
75
Ω
coaxial
set
FM RF SSG
AF OSC
Audio 31.25 kHz
external
modulation
terminal
modulation
terminal
Carrier frequency : 69 MHz
Output level
Output level
: 1mV (60 dB
µ
) (at 75
Ω
open)
Modulation
: AUDIO 31.25 kHz, 10 kHz deviation
(EXTERNAL MODULATION)
(EXTERNAL MODULATION)
TM1
IFT41
IC41
CN1
RV42
FM Tuned Level
Adjustment
FM Tuned Level
Adjustment
RV41
MW Tuned Level
Adjustment
MW Tuned Level
Adjustment
L1701
Sub Carrier Peak
Adjustment
Sub Carrier Peak
Adjustment
RV1701
Sub Carrier Level
Adjustment
Sub Carrier Level
Adjustment
CT1701
Sub Carrier Peak
Adjustment
Sub Carrier Peak
Adjustment
RV1702
VCO Adjustment
VCO Adjustment
frequency
counter
counter
+
–
+
–
–
level meter
Q1701
Q1702
Q1703
TP1701
(FILTER)
(FILTER)
TP1702
(VCO)
(VCO)
– 18 –
Note:
1.
CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
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
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.
signal level is low than specified value with the following checks.
S Curve Check
Procedure:
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and GND 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 GND 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
between A and B. And confirm peak to peak level within 3±1
Vp-p.
Vp-p.
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. 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.
distinguished at the center of the waveform.
• FR signal
E-F Balance (Traverse) check
(Without remote commander)
(Without remote commander)
Procedure:
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. Turned Power switch on. Press
1. Connect oscilloscope to test point TP (TEO) 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 button,
[ENTER/NEXT]
button and
^ but-
ton simultaneously several times to fluorescent indicator tube
display “SHUFFLE” is blink. (The sledding servo is turned
OFF.)
display “SHUFFLE” is blink. (The sledding servo is turned
OFF.)
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:
Traverse waveform
6. Press the
p button,
[ENTER/NEXT]
button and
^ button
simultaneously several times to fluorescent indicator tube dis-
play “SHUFFLE” is OFF. (The sleding servo is turned ON.)
Confirm the C (DC voltage) is almost equal to the A (DC volt-
age) is step 5.
play “SHUFFLE” is OFF. (The sleding servo is turned ON.)
Confirm the C (DC voltage) is almost equal to the A (DC volt-
age) is step 5.
Traverse waveform
CD SECTION
A
×
100 = less than ±7 (%)
B
A
B
symmetry
within 3
±
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:
1.3
1.3
±
0.3 Vp-p
+
–
–
BD board
TP (FEO)
TP (VC)
TP (VC)
oscilloscope
+
–
–
BD board
TP (TEO)
TP (VC)
TP (VC)
oscilloscope
A (DC
voltage)
B
0 V
level: 500
±
100 mVp-p
symmetry
Center of the waveform
C (DC
voltage)
0 V
Sled servo ON
Sled servo OFF
– 19 –
Adjustment Location:
[BD BOARD] (Conductor Side)
IC103
CNU102
IC101
IC
I02
I02
RF
FOK
VC
FEO
TEO
GND
CNU101
– 20 –
SECTION 7
DIAGRAMS
• Circuit Boards Location
TRANSFORMER board
CD-SW board
PANEL board
HP board
AMP (L) board
MAIN board
TCB board
(East European, CIS)
TUNER (FM / AM)
(E, Saudi Arabia, Singapore, Malaysia)
(East European, CIS)
TUNER (FM / AM)
(E, Saudi Arabia, Singapore, Malaysia)
AMP (R) board
SENSOR board
MOTOR (TURN) board
MOTOR (SLIDE) board
BD board
LEAF SW board
AUDIO board
CONNECTOR board
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