Tape Deck Section; Tuner Section - Sony XR-C550RDS Service Manual

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See the adjustment location from on page 18 for the
adjustment.

TAPE DECK SECTION

Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
test tape
WS-48A
(3 kHz, 0 dB)
Specification: Constant speed
Speed checker
–1.5 to +2.5%
Adjustment Location: See page 18.
Dolby Level Adjustment
Setting:
Preset 3 (PLAY MODE) button: NR OFF
SEL (BAS) button
TE
SEL (TRE) button
L 13942296513
SEL (BAL) button
SEL (FAD) button
SEL (VOL) button
D-BASS control
test tape
P-4-D400
(400Hz, 0dB)
set
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV401 (L-CH) and RV301 (R-CH) so that the level
meter reading is –6±1 dBs (0.35 to 0.43 V).
Adjustment Location: See page 18.
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0 dB=0.775 V
speed checker
or
frequency counter
4 Ω
set
– +
speaker out terminal
Frequency counter
2,955 to 3,075 Hz
: Center
: Center
: Center
: Center
: Maximum
: OFF
main board
TP (DOLBY L)/
level meter
TP (DOLBY R)
+
–
main board
TP (GND)
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8

TUNER SECTION

Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
[Note]
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM Noise Focus Adjustment
4. FM Signal Meter Adjustment
5. AM (MW) Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 14).
2. Push the SOURCE button and set to FM.
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3 6 7 1 3
FM
3. Push the preset 3 button.
FM
4. Adjust with the volume RV2 on TU1 so that the "FM" indica-
tion turns to "FM0" indication on the display window.
But, in case of already indicated "FM0", turn the RV2 so that
put out light "0" indication and adjustment.
Adjustment Location: See page 18.
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– 15 –
2 9 9 4 2 8
0dB=1µV
antenna jack (J1)
0.01 µ F
: 98.0 MHz
: 22 dB (12.6 µ V)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
1 5 0 5 8 2 9 9 4
Display
REG
Display
REG
Display
REG
m
co
9 9
set
2 8 9 9
INTRO
INTRO
INTRO