Sanyo M2422F - Tuner Adjustment

TUNER ADJUSTMENT
“Tl
M
ADJUSTMENT
(M2422F)
7
oe SG frequency Position of tuning dial Oscil!, cope
T1071,
T301
ee
Near
max.
capacity
T302,
T303
of
VC.
at
position
with no unrequired
Signal.
Step
Connect oscilloscope
to test point TP3, TPS
Connect sweep
generator to FM
aerial Terminal
10.7 MHz
(non modulation)
1304 —
Low end of dial scale | L106
MAX.
High end of dial scale | VCT-2
MAX.
Connect oscilloscope
‘
to
test
point
TP4,
TP5
Ratio Det.
87 MHz (400 Hz
30% :nodulation)
1093 MHz (400 Hz
30% modulation)
30 MHz (400 Hz
30% modulation)
106 MHz (400 Hz
30% modulation)
Connect FM SG. to
FM aerial Terminals.
Connect VTVM to
speaker terminal.
90 MHz on dial scale | L104
Connect VTVM to
speaker terminal.
Connect FM SG. to
AERIAL EM serial Terminals.
106 MHz on dial scale | VCT-1
©
o2)
O
7 Repeat adjustments.
PREPARE: 1. Variable Capacitors completely closed.
2. Set the dial pointer to very left line of dial scale.
3. Connect sweep generator, FM SG, VTVM and oscilloscope. FM antenna input impedance ts 75 ohm.
4. Use a screwdriver with plastic grip for all adjustments.
Se
SW1 ADJUSTMENT (M2422H) —
. Connections
Adjusting ae ; : , VTVM
Circuit SG frequency Position of tuning dial Adjustment Oscilloscope
: Low end of dial scale.
30% modulation)
Connect AM SG. . Connect VTVM to
to aerial terminal EXT. SP. terminals
through {RE dummy. ices ws 7.6 MHz (400 Hz isc-nd er dial ceal
. 30% modulation) Se ee eer gene?
2.5 MHz (400 Hz :
Connect
AM
SG.
30%
modulation)
2.5
MHz
on
dial
scale.
a : Connect VTVM to
AERIAL to aerial terminal EXT. SP terminals
through IRE dummy. 6.5 MHz (400 Hz 6.5 MHz on dial scal
30% modulation) : On Gta! scare.
Repeat adjustments.
PREPARE: 1. Variable capacitor completely closed. 4. Use a screwdriver with plastic glip for all adjustments.
2. Set the dial pointer to very left line of dial scale. 5. Selector switch to “SW1"
3. Connect signal generator to dummy aerial.
; VTVM
5
MAX.
1
SW2 ADJUSTMENT (M2422H)
Connections
Adjusting
Circuit
Position of tuning dial
Output
Connect AM SG.
to aerial terminal
through IRE dummy.
Tea
PE
set,
PREPARE: 1. Variable capacitor completely closed. - 4. Use a screwdriver with plastic glip for all adjustments.
2. Set the dial pointer to very teft line of dial scale. 5. Selector switch to ‘’SW2"’,
3. Connect signal generator to dummy aerial.
Connect VTVM to
EXT. SP. terminale
Connect AM SG.
to aerial terminal
through IRE dummy.
Connect VTVM to
EXT. SP. Terminals.
21 MHz (400 Hz}
30% modulation)
Repeat adjustments.