Tuner Adjustments - Sanyo DC-D9 Service Manual

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TUNER ADJUSTMENTS
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. LJSe a plastic screw driver for adjustments. Speaker
impedance :4 ohm
. Standard Output :500
mW . FM MODE switch : STEREO
. TUNING FM : 87.5-108.0 MHz ( 50 kHz step )
AM :522-1,611 kHz ( 9 kHz step )
FM ANTENNA
75 ohm
!I
QI
AM
LOOP
ANTENNA
1"
L2101
=3
L2151
Ho
4 0
CT251
flL2102
TP2.41 ( VT )
4 n J2437
TP242 (G)
++2239
TP231(L)
\
TP232(R)
'2317 g#'&2318
TP2{!&'9
SG RF Level :75 ohm Open Voltage dBPV
Antenna :75 ohm unbalanced , Modulation :1 kHz,
a. ADJUSTMENTS OF FM BAND
Dev. : ~ 75 kHz
(MONO) f 40
kHz (STEREO) k 6.75 kHz (PILOT)
Adjusting
Connections
Position of '
VTVM
Step
Circuit
SG Frequency
Adjustment Oscilloscope or
Input output
tuning dial
DC voltmeter
Connect to Digital
Tuning
87.5 MHz Low end L2102
1
0.90 -I.30V
---
DC voltmeter
coverage
TP 241 (H), TP 242 (G)
108.0 MHz High end
--
less than 9.OV
Connect to VTVM
..-. ,
TP231 (H) or TP232 (H),
90.0 MHz 90.0 MHz L2101
2 Tracking FM Antenna
Max.
(SG = 8dB#)
TP233 (G)
106.0 MHz 106.0 MHz
---
SG Modulation :1,000 Hz, 30°7&
b. ADJUSTMENTS OF AM BAND
IRE LOOP Antenna
Adjusting
Step
Circuit
--1--
Tuning
1
coverage
Connections
Position of
VTVM
SG Frequency
Adjustment Oscilloscope or
Input
output
tuning dial
DC voltmeter
I 1
I Connect to
Digital I 522 kHZ I
Low
end ] L2152 I 1.00t0.05V I
..-
Connect AM SG to
Test
Loop
(SG =
80dB4V)
DC voltmeter
TP241 (H), TP242 (G)
1611 kHz
High end
--
less than 8.OV
Connect to VTVM
603 kHz 603 kHz L2151
TP231 (H) or TP232 (H),
Max.
TP233 (G)
1404 kHz 1404
kHz
CT251