Sony HCD-D90AV / HCD-GR10AV / HCD-RX100AV / MHC-D90AV / MHC-GR10AV / MHC-RX100AV Service Manual ▷ View online
— 17 —
FM Polar Adjustment (East European, CIS model only)
Connection 1 :
FM RF SSG
FM antenna
terminal (75
terminal (75
Ω
)
75
Ω
coaxial
set
Carrier frequency: 69 MHz
Output level:
Output level:
1 mV (60 dBµ) (at 75
Ω
open)
Modulation:
AUDIO 1 kHz, 10 kHz deviation
Connection 2 :
75
Ω
coaxial
FM RF SSG
FM antenna
terminal (75
terminal (75
Ω
)
AF OSC
Audio 31.25kHz
external
modulation
terminal
modulation
terminal
Carrier frequency: 69 MHz
Output level:
Output level:
1 mV (60 dBµ) (at 75
Ω
open)
Modulation:
AUDIO 31.25 kHz, 10 kHz deviation
(EXTERNAL MODULATION)
(EXTERNAL MODULATION)
Procedure :
1. Set the modulation of FM RF SSG to AUDIO 1 kHz, 10 kHz
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 con-
3. Adjust the RV1702 so that the reading of frequency counter con-
nected to TP1702 (VCO) 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 (FILTER) becomes maximum.
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 (FILTER) becomes maximum. (SUB CAR-
RIER PEAK Adjustment)
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 (FILTER) becomes maximum. (SUB CAR-
RIER PEAK Adjustment)
9. Adjust the RV1701 so that the level at the moment becomes 14
dB higher value than the level recorded in step 4. (SUB CAR-
RIER LEVEL Adjustment)
RIER LEVEL Adjustment)
[TCB BOARD] (Component Side)
RV1701
Sub Carrier
Level
Sub Carrier
Level
L1701
IC1701
RV1702
VCO
VCO
Sub Carrier Peak
CT1701
set
+
_
frequency counter
level meter
TP1701
(FILTER)
(FILTER)
TP1702
(VCO)
(VCO)
IC1701
Adjustment Location: TCB board
Adjustment Location
[TCB BOARD] (Conductor Side)
— 18 —
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
E-F Balance (1 Track Jump) check
oscilloscope
BD board
TP (TEO)
TP (VC)
TP (VC)
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:
• x 100 = less then ± 7 (%)
• A + B = 500 ± 100 mVp-p
A – B
2 (A + B)
1 track jump waveform
0V
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
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
level: 1.3 ± 0.3 Vp-p
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
TIME/DIV: 500 nS
Center of the waveform
— 19 —
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARDS LOCATION
Note:
pA is including in AUDIO board.
pB is including in PANEL board.
pB is including in PANEL board.
POWER board
AUDIO board
(including
(including
p
A)
LEAF SWITCH board
p
A
MOTOR board
TRANS board
SURROUND board
CD SW board
PANEL board
(including
(including
p
B)
HP/MIC board
TC SW board
MAIN board
p
B
ENCAPSULATED COMPONENT
(Except AEP, UK, G, EE, CIS)
TCB board (AEP, UK, G, EE, CIS)
(Except AEP, UK, G, EE, CIS)
TCB board (AEP, UK, G, EE, CIS)
DECO board
(Exept D90AV/RX100AV: US, CND)
(Exept D90AV/RX100AV: US, CND)
— 20 —
MOTOR (TURN) board
CONNECTOR board
SENSOR board
BD board
MOTOR (SLIDE) board
• Abbreviation
CND :Canadian model
G
G
:German model
EE
:East European model
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