Sanyo M9998LU - Tuner Adjustment

TUNER ADJUSTMENT
“ DC voltage is 15V and Speaker Impedance 3 ohms. Output Power 50mW.
MW ADJUSTMENT
: 1 nai i Connections oe 7 cs 7
Step Pubipiitg a aan ee ig anak Position of tuning dial Adjustment
~T Connect sweep ~ Connect oscilto- Low end of dia! scale
1 LET generator to scope to EXT. SP pad ae ee under no station T304~T307
Test Loop terminals. ts ation signal.
aoacee tt: Racha
505 KHz (400 Hz z
. | ose Connect AM SG Connect VTVM to| 30% modulation) POOL ONS Cia seel:
mos to Test Loop speaker terminals.
3 Load High end of dial scale.
tld at Se eet . 600 KHz (400 Hz ,
‘ ANT Connect AM SG Connect VTVM to| 30% modulation) BOO e Oe Ce Fee:
: to Test Loop. speaker terminals.
5 E eo 1400 KHz on dial scale.
6 Repeat adjustments. = a
PREPARE: 1.
3. Selector switch to “MW”.
LW ADIUST MENT
Set the dial pointer to very left line of dial scale.
2. Connect sweep generator, AM SG, VTVM and oscilloscope.
4.
5;
Use a screwdriver with plastic grip for all adjustments.
Use a dummy of back lid and Rod antenna, adjust tracking
points.
es Te =
Adjusting | ss Connections fe Ss a ‘ VTVM
Step | _Cireui t input Guwat SG frequency Position of tuning dial Adjustment Oscilloscope
145 KHz (400Hz ‘
~ 4 7 Low end of dial scale. L11
sumed OSC Connect AMSG | Connect VTVM to | 30% modulation) on : .
ie rane to Test Loop. speaker terminals. | 295 KHz (400 Hz : F
? Way nanan = eataes 30% modulation) High end of dial scale.
160 KHz (400 Hz :
3 160 KHz ond ale.
ANT Connect AM SG Connect VTVM to | 30% modulation) 0 He crise
7 . to Test Loop. speaker terminals. | 280 KHz (400Hz _ 5
30% modulation) _ 280 KHz on dial scale.
5 {! Repeat adjustments.
PREPARE: 1,
3. Selector switch to “LW”.
SW a ritidipsies
—
Set the dial pointer to very left line of dial scale.
2. Connect sweep generator, AM SG, VTVM and oscilloscope.
30% modulation)
SG frequency
5.8 MHz (400Hz >
19 MHz (400Hz~
30% modulation) _
. Use a screwdriver with plastic grip for ail adjustments.
. Set the Fine Tuning to mechanical center.
. Use a dummy of back lid and Rod antenna, adjust tracking
points.
Position of tuning dial Adjustment
VTVM
Oscilloscope
Low end of dial scale.
High end of dial scale.
Step Adjusting Connections a
CCU Input Output, a Rs,
14 | Connect AM SG.
ose to ANT terminal Connect VTVM to
H 7, through EXT. SP. terminals.
2 | | dummy.
3 Connect AM SG.
ANT to ANT terminal Connect VTVM to
‘ through EXT. SP. terminals.
4 dummy.
5 Repeat adjustments.
“17.0 MHz (400 Hz
18.0 MHz (400 Hz
30% modulation)
30% modulation)
7.0 MHz on dial scale.
18.0 MHz on dial scale.
PREPARE: 4, Set the dial pointer to very left line dial scale.
2. Connect signal generator to dummy antenna.
5. Set the Fine Tuning to mechanical center.
3. Use screwdriver with plastic grip for all adjustments.
6. Use a Dummy antenna as follow.
FM PAB IUSTMENT.
4. Selector switch to “SW” 18°F
;
SO ohm
c t
Step Adjustin oe }_ Soupectons. SG frequency Position of tuning dial Adjustment
| Circuit “Input ‘Output
2 eens De mnee aes
Connect oscillo- :
OTR scope to TP4 (H) T30i; Tate (pare
Connect sweep & shield plate (E). | 10.7 MHz Near max. capacitance .
soot generator to FM | p= (0% modutation) tuning gang under
TP1 (H) & TP2 (E}| Connect oscillo- no station signal.
2 | Ratio Det. scope to TP5 (H} T303
| & shield plate (E).
se ere Pes inact ean ats Ba Eases ea ee - = = eae
i 87.25 MHz(400 Hz r
3 hes Connect £56 Connect VTVM to [30% modulation) Low end of dial scale. L106
to TP- : vena tae
oe ker terminal.
TP-2
(E)
Spee
109.0
MHz
(400
Hz
:
:
4 - : 30% modulation} = High end of diat scale. cT3
90.0 MHz (400 Hz :
is} 2 90.0 MHz on dial scale. L103, L104
ANT ey Cae Connect VTVM to | 30% modulation)
5 ; TP-2 (E) speaker terminal. | 106.0 MHz (400 Hz ,
( : etn 30% modulation) ee MHz on dial scale. eh CT2
; at | Repeat adjustments.
PREPARE: 1. Set the dial pointer to very left line of dial scale.
2. Connect sweep genrator, FM SG, VTVM and oscilloscope. FM antenna input impedance is 300 ohm.
3. Use a screwdriver with plastic grip for all adjustments.
4. AFC switch OFF.
—3—