Sony HCD-H700 - TUNER SECTION; FM SECTION ADJUSTMENTS; AM SECTION ADJUSTMENTS; FM Tuned Indication Lighting Level Adjustment

Note: As a front-end (FE]1) is difficult to repair if faulty,
replace it with new one.
TUNER SECTION
FM SECTION ADJUSTMENTS
Setting :
FM RF signal
generator
750 coaxial
Carrer frequency: 98MHz
modulation : 1kKHz, 75kHz deviation FM ANTENNA terminal
(TB1 or TB2)
VOM
(DC range)
ee
FM Discriminator Alignment (NULL Check)
Band: FM
Procedure :
1. Supply a lmV (60dBy) 98MHz signal from the ANTENNA
terminal.
2. Tune the to 98MHz.
3. Adjust IFT82 for 0V reading on the VOM.
Note: FM tuned indication lighting level adjustment should
be made after FM discriminator alignment.
Adjustment Location: main board
FM Tuned Indication Lighting Level Adjustment
Band: FM
Procedure:
1. Supply a 24 uV (25dBy ) 98MHz signal from the ANTEN-
NA terminal.
2. Tune the set to 98MHz.
3. Adjust RV81 so that the light up.
e Repeat the procedures in each adjustment several times,
and the frequency coverage and tracking adjustments
should be finally done by trimmer capacitors.
AM SECTION ADJUSTMENTS
Setting:
loop
antenna
B
loop antenna A
AM RF signal
generator ;
y)
30% amplitude
modulation by 400Hz signal
MW Tuned Indication Lighting Level Adjustment
Band: MW
Procedure:
1. Set loop antenna A so that the loop antenna, B input
level becomes 0.45mV (55dByu )
2. Tune the set to 999kHz.
3. Adjust the RV82 so that the light up.
SW OSC Voltage Adjustment
Band: SW
Procedure :
Connect the VOM to TP (OSC).
Tune the set to 5.95MHz.
Adjust T2 for 0.9 to 1.1V reading on the VOM.
Tune the set to 17.90MHz.
Adjust CT22 for 8.3 to 8.7V reading on the VOM.
SY I OO)
SW Tracking Adjustment
Band: SW
Procedure:
1. Cornect the VOM to speaker terminal.
2. Adjust for a maximam reading on VOM.
Signal generator and Adsustnene part
Set frequency
17.0MHz CT21
a eee
Adjustment Location: main board —component side—
[MAIN BOARD] (COMPONENT SIDE)
TB2
ANTENNA
cT21
SW TRACKING
ADJ
cT22
Sw OSC
TI
SW TRACKING
ADJ
T2
Sw OSC
VOLTAGE ADJ
RV81
FM TUNED INDICATION
LIGHTING LEVEL ADJ
IFT 82
FM DISCRIMINATOR
ALIGNMENT
TP81
MW (AM) TUNED
INDICATION LIGHTING
LEVEL ADJ
CD SECTION
Note:
1. CD Block basically constructed to operate with-
out adjustment. Therefore, check each item in
order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise
indicated.
Use the oscilloscope with more than 10M!2 im-
pedance.
4. Clean an object lens by an applicator with neutral
detergent when the signal level is low than
specified value with the following checks.
S Curve Check
oscilloscope
BD board
ere,
TP (FEO) om—-o¥
TP (VC) ow—lo-
Procedure :
1. Connect oscilloscope to test point TP (FEO) on
BD board.
2. Connect between test point TP (FES) and TP
(VC) by lead wire.
3. Turned Power switch on and actuate the focus
serch. (actuate the focus serch when disc table is
moving in and out.)
4. Check the oscilloscope waveform (S curve) is
symmetrical between A and B. And confirm peak
to peak level within 341Vp-p.
S curve waveform symmetry
within 3+1Vp-p
5. After check, remove the lead wire connected in
step 2.
Note: * Try to mesure several times to make sure
that 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 G
Procedure :
1. Connect
BD boa
Turn Pq
Put disq
Confir
check R
Note:
Clear RF si
can be clea
form.
RF signal
E-F Balan
Procedure:
1. Connec
(TEO)
2. Connec
BD boa
Turn P
Put dis
5. Confir
metrica
and ché
Traversé
alti
ov — -
aul
6. Remove