– 20 –
TUNER SECTION
(XR-C450: E, Saudi Arabia model only)
Cautions during repair
When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.
FM Auto Scan/Stop Level Adjustment
Setting:
SOURCE button : FM
FREQUENCY SELECT switch: 10 k
0dB=1µV
FM RF signal
generator
Carrier frequency : 97.9 MHz
Output level : 22 dB (12.6 µV)
Mode : mono
Modulation : 1 kHz, 75 kHz deviation
0.01 µF
set
antenna jack (J1)
Procedure:
1. Set to the test mode. (See page 19).
2. Push the SOURCE button and set to FM.
Display
FM
SHUF1
3. Push the preset 3 button.
Display
FM
SHUF1
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.
Display
Adjustment Location: See page 22.
SHUF1
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust RV231 (L-CH) and RV131 (R-CH) so that the level meter
reading is –6±0.5 dB (0.37 to 0.41 V).
Adjustment Location: See page 22.
See the adjustment location from on page 22 for the ad-
justment.
0 dB=0.775 VTAPE DECK SECTION
Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
set +–
test tape
WS-48A
(3 kHz, 0 dB)
LINE OUT
10 kΩ
speed checker
or
frequency counte
r
Speed checker Frequency counter
–1.5 to +2.5% 2,955 to 3,075Hz
Specification: Constant speed
Adjustment Location: See page 22.
DOLBY Level Adjustment
Setting:
Preset 3 (DOLBY) button : OFF
SEL (BAS) button : Center
SEL (TRE) button : Center
SEL (BAL) button : Center
SEL (FAD) button : Center
SEL (VOL) button : Maximum
D-BASS control : OFF
set +
–
test tape
P-4-D400
(400Hz, 0dB)
main board
level meter
main board
TP (DOLBY )
TP (GND)
L-CH: IC301 7
R-CH: IC301@¢