If - Bang & Olufsen beomaster 2000 Service Manual

Bang&Oluben
17. Med 1L18 justeres indtil modtageren ligger midt
pA mAlesenderfrekvensen
18. 1L15 justeres til maksimum outpul
19. Gentag evl punkt 13 til18.
20. Det kontrolleres at skalaen dekker bindgran-
serne bide pi MW & LW.
MF
En sweepgenerator tilsluttes antenneindgange& og
indstilles til centerfrekvens *455 ktlz LlD Wlz.
Basis pA 1TR29 kortsluttes til stel.
MW altiveres og modtageren indstilles pi 1500 kHz.
1L12 forstemmes ved at dreje kernen ud.
Oscilloskop tilsluttes 1TP9.
1L13 justeres til maksimum og symmetrisk MF kurve.
Sweepgeneratorens frelsens andres til 461 ldlz.
1L12 justeres til minimum MF kurve.
Kortslutningen pd, basis af 1TR29 fierna.
*I nogle apparater er b6ndpasfilteret 1BP4 ph 460 kllz.
I disse modtagere skal AM mellemfrekvensen juste
res med centerfrekvensen 460 kIIz.
t7.
18.
19.
20.
IF
Connect a sweep generator to the aerial input and set
it to centre frequency of *455 kllz A10 kllz.
Make a jumper between the base of 1TR29 and the
chassis.
Activate MW and set the receiver to 1500 ldlz.
Detune 7Ll2 by turning its core out
Connect an oscilloscope to 1TP9.
Adjust 1L14 to maximum and symmetrical IF curve.
Alter the frequency of the sweep generator to
46lWlz.
Adjust LLlz tn minimum IF curve.
Rem.oae the jurn|er Irom the base of 1TM9.
*In some receivers the bandpass filter 1BP4 is at
460 k}lz.In these receivers the AM intermediate fre-
quency must be adjusted with the centre frequency
460 Wlz.
5'6
Adjust with 1L18 until the receiver lies centrally
on the frequency of the generator.
Adjust 1L15 to maximum outpul
If necessary, repeat the points 13 to 18.
Check that the dial covers the band limits of both
MW & LW.