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Sra 7
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Stabilisation 17 V
Adjust R 507 for 17 V
R 507 is to be found
on BS 5419
Voltmeter on
BS 5419 /SV 31/4and3
Volume to minimum.
Set to be switched on
approx. 2 mins. before
adjustment.
Unloaded
O/P i. e.
without loudspeakers.
Range:
AUX,
No I/P Signal.
Voltmeter on BS 5419 /
SV
31/1 and2or
SV 33 /
tand2
R 510 ts to be found
on BS 5419
Adjustment of O0/P
Amplifier
(Quiescent Current)
Remove
the fuses
Fu. 401
and
Fu. 404
alternately and clip
a OC current
instrument
across
the fuse hoider.
Also bridge the fuse
holder with a 1 HF
capacitor
Adjust R 414
and
R 412
for 35 mA +2mA
After adjustment,
1
remove
the 1 uF
capacitor and the DC
current
instrument.
Replace
fuse
Connect
centre
zero
meter (+ 3 V) to Bu. 403
and 404 alternately
Check mid-point
voltage U,..4 S 20 mV
Adjustment of
Select FM Range.
Dial pointer on 108.08 MHz
c) Signal 87.5 MHz on
BU 601.
Dial pointer on 87,5 MHz.
c) Centre zero instrument
onM 7/M8
Cc) Adjust with the
R205:0V
Adjust R 756 to a point
where
none
of the
diodes
of the Field
Indicator
are
lit
Field Strength
indicator
Adjust set to approx.
With an 1/P signai of
102 MHz. No |/P Signal!
10 mV all 10 diodes
must be lit
Set R 725 so the 5"
LED lights
Frequency Indicator;
Tune to 104 MHz
R 725 is to be found
on BS 5745
Operating Condition:
Stereo
Monitor
button
pressed.
Volume
to max.
AF Generator
(f = 1 kHz) to Socket
308 /Pt.3 and5
(Monitor)
Check of Muting
Multimeter AC-range
on BU 403/404
Select an AF input that
will give an output
voitage of 10 V,,,, on
Bu 403/404.
On switching the
Selector switch S 301
between two operating
modes, the voltage
must
be damped
by
34 dB
Muting: R 134 has been so adjusted at the factory that with an I/P voltage of = 1.5 nV (into 60 Ohms) the muting will get into function.
Criterion for alignment: The DC voltage at SV 36/2 jumps from 2 V to approx. 16 V. (R 109: vd. p. 7, demodulator alignment).
a
+3V
3)
BU 403/404
Voltmeter
f= 1kHz
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