Saba Transall de Luxe automatic - Alignment Instructions - FM Tuner; FM Tuner and IF Alignment

Abgleichanleitung
Alignment Instructions
Abgleich des FM-Tuners
1) Voltmeter an Punkt 9 (+) und Masse legen.
2) Bei 105 MHz (Empfangerabstimmung auf
Rechtsanschlag) mit P 63 so einstellen, daB
zwischen Punkt 9 (+) u. Masse 20 V stehen.
3) Bei 87 MHz (Empfangerabstimmung auf
Linksanschlag) mit P 62 so einstellen, da
zwischen Punkt 9 (+) u. Masse 3,5 V stehen.
4) Bei 95 MHz mit P 60 so einstellen, daB
zwischen Punkt 9 (+) u. Masse 7,8 V stehen
5) Erforderlichenfalls 2) — 4) wiederholen.
UKW-MeBsender an Buchse 20/4 und 20/8 bei ge-
drickter Taste E 1 - 8 (Einschubschalter) an-
schlieBen. Batteriespannung dber Buchse 20/6
und 20/7 zufihren.
1a) Bei 90 MHz L 21 (Osz.) L 18 und L 16 auf
Maximum abgleichen.
1b) Bei 101 MHz C 43 (Osz.) C 38 und C 23,
auf Maximum am RVM abgleichen.
1c) Erforderlichenfalls 1a) und 1b) wiederholen.
1d) Bei 95 MHz mit P 60 Eichung gegebenenfalls
korrigieren.
R1+R22:800Q ———————
T 7
R1 R2 ¢1 | |
Mef3sender | 15p C2 |
SIGNAL GENERATOR | 60p |
|
See er ee _I
Fig. 1
FM-Tuner
Transall /VSO 798
P 59
Mit P 59 werden Transistor-Toleranzen ausge-
glichen. Braucht normalerweise nicht nachge-
stellt werden.
P 59
Compensation of transistor-tolerances.
P 59
Compensation des tolérance de transistors.
4
Steady Current Adjustment
The adjustment should be carried out with a
battery voltage of 7 volts without any in-
put signal, with the volume control turned down.
P 404
Only the EIN-AUS (ON-OFF) button should be
pressed. Take out fuse Si 401 (M 1,6 A) and
connect ampere-meter. Adjust P 404 for 20 mA.
AM-alignment
a) Connect VTVM to test points D and M.
b) Adjust RF signal so that the VTVM reads
about 0,15 volts.
IF Alignment 460 Ke
a) Only the EIN-AUS (ON-OFF) button should
be pressed.
b) Connect signal generator, at 460 Ke, un-
modulated, through a 0,01 mf capacitor to
C 151/U 8 (T 151-AF 121).
c) Detune IF trap with L 131.
Important! The coupling of the IF-transformers
is decreased by turning coupling screw coun-
ter-clockwise and increased by turning it clock-
wise.
IF Transformator VI
Adjust circuit to maximum with L 204/205.
IF Transformer II
Adjust IF trap to minimum with L 86/87.
IF Transformer V
1) Adjust coupling subcritically with K 183/184.
2) Adjust both circuits with L 183 and L 184
to maximum.
3) Adjust coupling critically with K 183/184
(maximum output voltage).
4) If necessary repeat 1) — 3).
IF Transformer IV
1) Adjust coupling subcritically with K 163/164.
2) Adjust both circuits with L 163 and L 164
to maximum.
3) Adjust coupling critically with K 163/164
(maximum output voltage).
4) If necessary, repeat 1) — 3).
5) Set coupling with K 163/164 subcritically
a decreasing audio-frequency by about
10°/o.
IF Trap, 460 Ke
Adjust IF trap to minimum with L 131.
Alignment of Oscillator and Preselection.
Check: with pointer on left, pointer must be
exactly on the corresponding point on the dial.
The rotor of the variable capacitor must be
flush in the stator. Couple signal generator
loosely to the ferrite antenna by means of a
ferrite rod with spool (distance min. 4 inches)
1) Press button L. At 190 Ke adjust L 232/3
(osc.) and L 106/7 (ant.) to maximum.
2a) Press button M. At 570 Ke adjust L 236/7
(osc.) and L 103/2 (ant.) to maximum.
2b) At 1520 Ke adjust C 246 (osc.) and C 104
(ant.) to maximum.
2c) If necessary repeat 2a) and 2b).
3a) Press button K. Fine-tuning on SW in the
center.
At 8 Mc adjust L 231 (osc.) and L 101 (ant.)
to maximum.
3b) At 16 Mc adjust C 236 (osc.) and C 101
(ant.) to maximum.
3c) If necessary repeat 3a) and 3b).
4) Press button “49-m-Band“. At 6,1 Mc ad-
just L 234 (osc.) and C 114 (ant.) to maxi-
mum.
Now insert the receiver in the car bracket.
Connect signal generator to antenna socket
through dummy antenna (Fig. 1). Turn antenna
trimmer (C 803) in the car bracket to its cen-
ter position.
5a) Press button M. Align L 12 to maximum
at 950 Ke.
5b) Align L 113 to maximum at 1520 Ke.
5c) Align C 803 (in the car bracket) to maxi-
mum at 570 Ke.
5d) If necessary repeat 5a) — 5c).
6) Press button L. Align L 111 to maximum at
190 Ke.
FM Alignment
a) Press button UK and button U. Switch off
“Automatic”.
b) Connect VTVM to test points X and X’
c) Connect micro-ampere-meter with center zero
in series with 100-kiloohm to test points
Z and M
d) Connect audio voltmeter to the loudspeaker.
e) At sockets 17/4 and 17/8 there should be no
more than 3 v, when the potential-trans-
former (T 61-AC 122) is being adjusted. With
that current adjust P 64 in such a way that
Gr. 61 will be constant (22-26 v). Now insert
the 3 remaining-batteries.
IF Alignment 10,7 Mc
Connect signal generator (unmodulated, output.
cable matched) through 1000 mmf. to emitter T 14
(testpoint ZF) and chassis. During the alignment
the VTVM should read about 1,5 volts. Detune
L 16 and L 18 until the noise voltage disappears
on the voltmeter (for thisset receiver to 95 Mc).
Filter VI (Ratio Detector)
1) Adjust coupling subcritically with K 201/3.
2) Adjust primary circuit with L 201 to maximum
on voltmeter.
3) Adjust secondary circuit with L 203 to zero
On micro-ampere-meter.
Filter V
Adjust circuit L 181 to max. on voltmeter.
Filter IV
1) Adjust coupling subcritically with K 161/2.
2) Adjust both circuits with L 161 and L 162 to
max.
3) If necessary repeat 1) and 2).
4) Adjust coupling critically with K 161/2 (ma-
ximum on voltmeter).
Filter Ul
1) Adjust coupling subcritically with K 1414/2.
2) Adjust both circuits with L 141 and L 142 to
max.
3) If necessary repeat 1) and 2).
4) Adjust coupling critically with K 141/2 (ma-
ximum on voltmeter).
5) Adjust coupling subcritically with K 141/2
thus decreasing voltage on VTVM by about
5%o.
Filter Il
Adjust circuit with L 84 to max. on tuning indi-
cator.
Filter |
1) Adjust coupling subcritically with K 23/4.
2) Adjust both circuits with L 23 and L 24 to
max.
3) If necessary repeat 1) and 2).
4) Adjust coupling critically with K 23/4 (max.
on voltmeter).
5) Adjust coupling subcritically with K 23/4 this
decreasing voltage on VIVM by about S/o.
Filter VI (Ratio Detector)
Signal generator must now be freq. mod. (freq.
deviation about 20 Kc). Voltage between test
points X — X’ should be about 2 volts.
1) Tighten coupling with K 201/3 until the audio
voltage at the output has fallen 10%. below
max.
2) Adjust secondary circuit with L 203 to zero
on micro-ampere-meter.
3) Adjust primary circuit with L 201 to max.
Signal generator must now be 30% ampl.
mod.
4) Adjust P 201 to min. audio voltage.
5) Adjust primary circuit with L 201 to max.
6) Adjust secondary circuit with L 203 to ztro
on micro-ampere-meter.
Alignment of the FM-Tuner
1) Voltmeter between point 9 (+) and chassis.
2) At 105 Mc set potentiometer P 63 in such a
way between point 9 (+) and chassis, thre
will be a voltage of 20 v.
3) At 87 Moc set potentiometer P 62 in such a
way a voltage of 3,5 v is between poin 9
(+) and chassis.
4) At 95 Mc set potentiometer P 60 in such a
way a voltage of 7,8 v is between poin 9
(+) and chassis.
5) If necessary repeat 2) — 4).
Connect Signal generator to sockets 20/4 ind
20/8 after having pressed key Ei . . 8. Now
connect batterie-voltage to sockets 20/6 and 4/7.
1a) At 90 Mc adjust L 21 (osc.) L 18 and L 46
to max.
1b) At 101 Mc adjust C 43 (osc.) C 38 and C23
to max.
1c) If necessary repeat 1) and 2).
1d) At 95 Mc, if necessary, correct calibraion
with P 60.
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