Table of Contents
Advertisement
QQ
3 7 63 1515 0
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 Noise Focus Adjustment
3. FM Stereo Separation Adjustment
4. FM Signal Meter Adjustment
5. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 14).
2. Push the SOURCE button and set to FM.
TE
L 13942296513
FM
3. 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 17.
www
.
http://www.xiaoyu163.com
0 dB=1 µV
antenna jack (J1)
0.01 µ F
set
: 22 dB (12.6 µ V)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
Display
REG
Display
REG
x
ao
u163
y
i
http://www.xiaoyu163.com
2 9
8
FM Noise Focus Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level
Mode
Modulation
Procedure:
1. Tune the 98.00 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV3 on TU1 so that the output level is
(A) –32 ± 3 dB then signal generator input set to –20 dB.
Adjustment Location: See page 17.
FM Stereo Separation Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Q Q
3
6 7
1 3
1 5
Carrier frequency : 98.00 MHz
INTRO
Output level
Mode
Modulation
Procedure:
FM Stereo
signal generator
output channel
L-CH
INTRO
R-CH
R-CH
L-CH
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 30 dB
co
Adjustment Location: See page 17.
.
– 15 –
9 4
2 8
antenna jack (J1)
0.01 µ F
4 Ω
set
speaker out terminal
: 60 dB (1 mV)
: mono
: 1 kHz, 75 kHz deviation (100%)
antenna jack (J1)
0.01 µ F
4 Ω
0 5
8
2 9
9 4
2 8
set
speaker out terminal
: 70 dB (3.2 mV)
: stereo
: main: 1 kHz, 20 kHz deviation (22.6%)
sub: 1 kHz, 20 kHz deviation (22.6%)
19 kHz pilot: 7.5 kHz deviation (10%)
Level meter
Level meter
connection
reading (dB)
L-CH
L-CH
Adjust RV4 on TU1
for minimum reading.
R-CH
R-CH
Adjust RV4 on TU1
for minimum reading.
m
9 9
level meter
+
–
level meter
9 9
+
–
A
B
C
D
Advertisement
Table of Contents
