Am Adjustments; Top Voltage, Osc. & Aerial Circuits - Bang & Olufsen beomaster 2000 Service Manual

5-5
En stereokoder (encoder) tilsluttes antenneindgangen
Et watfrneter eller et AC voltrneter tilsluttes hojttaler-
udgangen
Med potentiometeret 1R69 justeres, til der opnis
miminum signal i umoduleret kanal.
1L200 & 1L40O md ikke justua.
AM TUSTERINGER
NB: Der md ikkc justera i MW oscillatorapolen 1L17.
Anvend svagest mulige signaler under justeringsar-
bejdeL
Topspending
osc. & antennekredse
MW
1. AM mfllesender tilsluttes antenneindgangen og
indstilles til at afgive 1610 ktrIz, modulation 300/o -
400 Hz eller 1 kFlz.
2. MW aktiveres og skalaviseren stilles over
1610 kHz market
3. DC volfrneter tilsluttes 1TP8.
4. 1R100 justeres til der miles 25V.
5. Wattrneter tilsluttes LF udgangerl eller AC
voltneter tilsluttes 1TP7.
6. Med 1C97 justeres indtil modtageren ligger midt
pi mllesenderfrekvensen
7. Mdlesenderens og modtagerens frekvens endres
til 1500 kIIz.
8. 1C90 justeres til maksimum output
9. Milesenderens og modtagerens frekvens endres
al575 WIz.
10. 1R93 justeres indtil modtageren ligger midt pi
milesenderfrekvensen
11. 1L16 justeres til maksimum output
12. Gentag evt punkt 7 til 11.
L W
13. LW aktiveres, milesenderen og modtageren
indstilles pi 330 kIIz.
14. Med 1C99 justeres indtil modtageren ligger midt
pA milesenderfrekvensen
15. 1C83 justeres til maksimum outpul
16. Milesenderens og modtagerens frekvens endres
til 160 kllz.
Bang&Olube
Connect a stereo coder (encoder) to the aerial input
Connect a wattrneter or a voltneter to the loud-
speaker outpul
Adjust with the potentiometer 1R69 until a minimum
signal is obtained in non-modulated channel.
1L200 & 1L400 must not be adjusted
AM ADIUSTMENTS
NOTE! It is nnt allonable to mahc adjustments in the MW
osci.llator coi.l 1L17.
Always use signals as weak as possible during adjust-
ments.
Top Voltage, Osc" & Aerial Circuits
]UTW
1. Connect an AM signal generator to the aerial
input and set it to yield 1610 H{2, modulation 300/o
- 400 kHz or lElz.
2. Activate MW and set the dial pointer over the
1610 kIIz mark
3. Connect a DC voltrneter to 1TP8.
4. Adjust 1R100 until a reading of.25Y is obtained
5. Connect a wathneter to the AF output, or connect
an AC voltneter to 1TP7.
6. Adjust with 1C97 until the receiver lies centrally
on the frequency of the generator.
7. Alter the frequencies of the signal generator and
the receiver to 1500 kllz.
Adjust 1C90 to maximum.
Alter the frequencies of the signal generator and
the receiver to 575l*Iz.
Adjust 1R93 until the receiver lies centrally on the
frequency of the generator.
Adjust 1L16 to maximum output
If necessary, repeat the points 7 to 11.
L W
13. Activate LW and adjust the frequencies of the
signal generator and the receiver to 330 kIIz.
14. Adjust with 1C99 until the receiver lies centrallv
on the frequency of the generator.
15. Adjust 1C83 to maximum output
16. Alter the frequencies of the signal generator and
the receiver to 160 kIIz.
8.
9.
10.
1 1 .
12.