Tuner Adjustments; Parts Location - Sanyo MCD-S870F Service Manual

TUNER ADJUSTMENTS
Use a plastic screw driver for adjustments.
. Adjust the
intermediate frequency of AM and FM to the frequency of ceramic filter.
Supply voltage :DC12.OV
Speaker impedance
Standard output
Function switch
BASS
MID TREBLE
4 ohm
50
mW (450
mV)
RADIO
Center
L2005
PARTS LOCATION
L2101
&
VCT-1 VCT-3
VCT-2
~210*'
\
J
m
K
N"
XF213
J2116
Cl
J2118
c
1C201 ~
@) PIN
1
C2106""
Jxa
ADJUSTMENT
BAND SELECT SWITCH : AM
Step
Adjusting
Circuit
Connections
SG Frequency Position of tuning dial Adjustment
VTVM
Input
Ootput Oscilloscope
Closed the output
Connect sweep
terminal by sweep
generator to C2106
generator, it place to
(H)& J2108 (G)
455 kHz
Low
XF213
-4
L2005.
Connect AMSG to
Connect VTVM to
517 kHz
Low end
L2008
Max.
Test Loop speaker terminals
1750 kHz High end
VCT -4
$
1 IF
2
Tuning
3
coverage
4
Tracking
5
Connect AMSG to Connect VTVM to
600 kHz
600 kHz
L2005
Max.
Test Loop speaker terminals
1400 kHz
1400 kHz
VCT -3
I 6 I
Repeatadjustrnents
2.
FM ADJUSTMENT
BAND SELECT SWITCH :
FM
Adjusting
Connections
Step
SG Frequency
Circuit Input
Ootput
VTVM
Oscilloscope
Position of tuning dial
Low
Adjustment
connect
sweep 9en-
Connect sweep gen-
1 IF
eratorto IC201 0
eratorto C2106 (H)
10.7 MHz
(H) &J2118 (G)
& J2108 (G)
A
...
4
2
Connect FM SG to
Tuning Connect VTVM to
+
87 MHz
J2116 (H)
3
coverage
speaker terminals
& J2118
(G)
109 MHz
Low end
L2102
VCT -2
Max.
High end
4
Connect FM SG to
Connect VTVM to
90 MHz
Tracking
J2116 (H)
5
speaker terminals
& J2118 (G)
106 MHz
6
Repeat adjustments
L2101
VCT -1
90 MHz
106 MHz
Max.
I
-3-