Tuner Adjustments - Sanyo DC-F170 Service Manual

TUNER ADJUSTMENTS
a.
-
Use 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 ( 200
kHz step )
AM: 522-1,611 kHz(l OkHz step)
TP231 ( L)
TP2&l (
VT)
"-X =TP232(R)
L2101
R2317~~ R2319
FM :;;t4:NA
CT2S1
AM LOOP
@-
ANTENNA
L2152
L2151
SG RF
Level :75 ohm
Open
Voltage dBPV
Antenna :75
ohm unbalanced , Modulation :1 kHz,
Dev. . " + 75 kHz (MONO) ~ 40 kHz (STEREO) t 6.75 kHz
ADJUSTMENTS OF FM BAND
(PILOT)
Adjusting
Connections
Position
of
VTVM
Step
Circuit
SG Frequency
Adjustment Oscilloscope or
Inpu$.. output
tuning dial
DC voltmeter
./ . .A. . ,"..
./,
Tuning
Connect to Digital
87.5 MHz Low end L2102
1.1 to.2v
1
— DC voltmeter
coverage
TP 241 (H), TP 242 (G)
108.0 MHz High end
--
lessthan9.5V
Connect to VTVM
TP 231 (H)
90.0 MHz 90.0 MHz L2101
2 Tracking FM Antenna
Max.
(SG = 8dB/N)
or TP 232 (H),
TP 233 (G)
106.0 MHz 106.0 MHz
---
SG Modulation :1,000 Hz, 307.
b. ADJUSTMENTS OF AM BAND IRE Loop Antenna
Adjusting
Connections
Step SG Frequency
Position of
Circuit
Adjustment
Input output
tuning dial
Connect to Digital
Tuning
522 kHz
Low end L2152
1
—
DC voltmeter
coverage
TP 241 (H), TP 242 (G)
1611 kHz High end
--
Connect AM SGto
Connect to VTVM
603 kHz 603 kHz
L2151
2
Tracking
Test Loop
TP231 (H)or
(SG = 80 dB/V)
TP232 (H), TP 233 (G)
1404 kHz
1404 kHz CT251
-5-
VTVM
Oscilloscope or
DC voltmeter
+
1.00 t 0.05 v
less than 9.5 V
Max.
I