Electrical Adjustments - Sony HCD-GN1300D Service Manual

HCD-GN1300D
TUNER SECTION
[FM Tune Level Check]
SET
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM
antenna input directly.
* Carrier Freq : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm "coaxial cable" to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm "TUNED" is lit on the display for A, B and C
signals.
The mark of "TUNED" means "The selected station signal is
received in good condition."
22
SECTION 5

ELECTRICAL ADJUSTMENTS

1. Demagnetize the record/playback head with a head demagne-
FM signal generator 2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
4. The adjustments should be performed with the rated power
OUT (75 )
5. The adjustments should be performed in the order given in this
6. The adjustments should be performed for both L-CH and
7. Switches and controls should be set as follows unless other-
• Test Tape
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Procedure:
1. Mode: Playback
2. Turn the adjustment screw and check output peaks. If the
Screw
position
DECK SECTION 0 dB=0.775V
tizer.
parts adjusted.
supply voltage unless otherwise noted.
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit ad-
justment.)
RCH.
wise specifi ed.
Tape Signal
P-4-A100 10 kHz, –10 dB
DECK
test tape
P-4-A100
(10 kHz, –10 dB)
set
peaks do not match for L-CH and R-CH, turn the adjustment
screw so that outouts match within 1dB of peak.
within
L-CH
1dB
peak
Output
level
R-CH
peak
L-CH
peak
Used for
Azimuth Adjustment
Audio Out Jack
at Back Panel
(White-L-CH)
level meter
(Red-R-CH)
+
–
Chassis GND
within
1dB
Screw
position
R-CH
peak