Sony HCD-GRX8 / HCD-R800 / HCD-RX88 / HCD-RX99 / MHC-GRX8 / MHC-R800 / MHC-RX88 Service Manual ▷ View online
– 17 –
Procedure:
1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 to the point (moment) when the TUNED indicator
1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust RV42 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: TCB board
TUNER SECTION
0dB=1
µ
V
Note 1:
As a front-end (FE1) is difficult to repair if faulty, replace
it with new one.
it with new one.
Note 2:
No adjustment is needed due to a tuner pack for except
AEP, UK, German, East European, CIS models.
AEP, UK, German, East European, CIS models.
AM Tuned Level Adjustment
(AEP, UK, German, East European, CIS model only)
(AEP, UK, German, East European, CIS model only)
Note: FM Tuned Level adjustment should be performed after this
AM Tuned Level Adjustment.
Setting:
Band: MW
Band: MW
Procedure:
1. Set the output of SSG so that the input level of the set becomes
1. Set the output of SSG so that the input level of the set becomes
55 dB.
2. Tune the set to 999 kHz or 1,050 kHz.
3. Adjust RV41 to the point (moment) when the TUNED indicator
3. Adjust RV41 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: TCB board
FM Tuned Level Adjustment
(AEP, UK, German, East European, CIS model only)
(AEP, UK, German, East European, CIS model only)
Note: This adjustment should be performed after the AM Tuned
Level Adjustment.
Setting:
Band: FM
Band: FM
FM ANTENNA terminal (TM1)
FM RF SSG
75
Ω
coaxial
Carrier frequency: 98MHz
Modulation:
Modulation:
AUDIO 1kHz, 75kHz
deviation (100%)
deviation (100%)
Output level:
25dB (at 75
Ω
open)
set
loop antenna
AM RF SSG
loop antenna
(Supplied accessories)
(Supplied accessories)
30% amplitude
modulation by
400Hz signal
modulation by
400Hz signal
Modulation: 999 kHz (at 9 kHz step)
1,050 kHz (at 10 kHz step)
60cm
AM antenna
terminal (TM1)
terminal (TM1)
set
Field strength dB (
µ
V/m) = SSG output level dB (
µ
V/m) –26dB.
RV41
AM Tuner Level
AM Tuner Level
TM1
RV42
FM Tuned
Level
IC21
Adjustment Location
[TCB BOARD] (Component Side)
[TCB BOARD] (Component Side)
– 18 –
FM Polar Adjustment (East European, CIS model only)
Connection 1 :
Connection 2 :
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)
Adjustment Location: TCB board
Adjustment Location:
[TCB BOARD] (Conductor Side)
FM antenna
terminal (75
terminal (75
Ω
)
FM RF SSG
75
Ω
coaxial
Carrier frequency: 69 MHz
Output level:
Output level:
1 mV (60 dB
µ
) (at 75
Ω
open)
Modulation:
AUDIO 1 kHz, 10 kHz deviation
set
FM antenna
terminal (75
terminal (75
Ω
)
Audio 31.25 kHz
external
modulation
terminal
modulation
terminal
FM RF SSG
AF OSC
75
Ω
coaxial
Carrier frequency: 69 MHz
Output level:
Output level:
1 mV (60 dB
µ
) (at 75
Ω
open)
Modulation:
AUDIO 31.25 kHz, 10 kHz deviation
(EXTERNAL MODULATION)
(EXTERNAL MODULATION)
set
frequency counter
level meter
TP1701
(FILTER)
(FILTER)
TP1702
(VCO)
(VCO)
IC1701
L1701
CT1701
Sub Carrier Peak
RV1701
Sub Carrier
Level
Sub Carrier
Level
IC1701
RV1702
VCO
VCO
– 19 –
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
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
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
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
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
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.3
±
0.3 Vp-p
oscilloscope
BD board
TP (RF)
TP (VC)
TP (VC)
+
–
–
symmetry
A
B
Within 3
±
1 Vp-p
oscilloscope
BD board
TP (TE)
TP (VC)
TP (VC)
+
–
–
E-F Balance (Traverse) Check
Procedure :
1. Connect oscilloscpe to test point TP (TEO) on BD board.
2. Turned Power switch on. Press FUNCTION button to select
1. Connect oscilloscpe 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 ^ button
simultaneously several times until the ‘’SHUFFLE” on the
fluorescent display tube blinks.
(The sledding servo is turned OFF.)
fluorescent display tube blinks.
(The sledding servo is turned OFF.)
5. 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 ± 7%
Confirm the following :
A/B x 100 = less than ± 7%
Traverse waveform
0V
level : 500 mV
±
100 mVp-p
A (DC voltage)
Center of the waveform
B
6. Press the
p button, ENTER/NEXT button and ^ button
simultaneously several times until the ‘’SHUFFLE” on the
fluorescent display tube goes off. (The tracking servo and
sledding servo are turned ON.) Confirm the C (DC voltage) is
almost equal to the A (DC voltage) is step 5.
fluorescent display tube goes off. (The tracking servo and
sledding servo are turned ON.) Confirm the C (DC voltage) is
almost equal to the A (DC voltage) is step 5.
Traverse waveform
0V
C (DC
voltage)
voltage)
Sled servo
OFF
OFF
Sled servo
ON
ON
Adjustment Location :
[ BD BOARD ] — SIDE A —
TP (RF)
TP
(FOK)
(FOK)
IC101
TP
(VC)
(VC)
TP
(GND)
(GND)
TP
(TEO)
(TEO)
TP
(FEO)
(FEO)
IC103
IC102
IC102
CN101
oscilloscope
BD board
TP (FEO)
TP (VC)
TP (VC)
+
–
–
SECTION 7
DIAGRAMS
7-1. CIRCUIT BOARDS LOCATION
SENSOR board
CONNECTOR board
BD board
MOTOR (SLIDE) board
MOTOR (TURN) board
– 20 –
POWER board
CONT COM board
AUDIO board
LEAF SW board
TRANSFORMER board
MAIN board
CD-SW board
MIC board
PANEL board
HP board
ENCAPSULATED
COMPONENT (GRX8/R800)
TCB board (RX88/RX99)
COMPONENT (GRX8/R800)
TCB board (RX88/RX99)
DECO board
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