Bang Olufsen Beomaster 900 Service Manual

Page 2

95 BEOMASTER 900 1

name

TECHNICAL DATA

AM aerial: Ferrite aerial for LW,MW,FW;push-button switching to

external aerial.

Channel separation: Better than 28 dB.

Dimensions,l\/lodel K: 291/4 in.wide, 59/16 in.high,9 in. deep

(744 x 142 X 229 mm).
Dimensions, Model M: 17 in. wide, 5 9/16 in. high, 9 in. deep
(432 X 142 x 229 mm).

External-speaker impedance: 3-59, switching provided in connector soc-
kets.DIN sockets for two side speakers
and one additional speaker on left channel.

FM aerial: Built-in FM aerial, and telescopic dipole.

FM: Tuner with automatic frequency control (AFC).

Frequency range: 30-15000 c/s at iSdB (bass and treble controls at

mid-scale).

Gramophone connection: B&.O stereo player G 42 VF or crystal pick-up

Sensitivity: 180 mV at max.output.

Hum with volume control at minimum: under 4 microwatts.

Oscillator radiation: Suppressed in conformity with present German

standards.

Power consumption: 10 watts at lUOmW output.Max. output approx.65

watts.

Power output: 2 X 6 watts.

Stereo indicator: Green light for stereo gramophone, stereo reproduca

tion from tape, and with stereo decoder installed.

Supply voltage: 220 volts AC (for operation on 110 and 24:0 volts,see

page 6).

Tuning indicator: Pointer instrument.

Tape recorder connection: 5-contact DIN socket for monaural and ste-
reo tape recorders.Playback through sepa-
rate push~button.

Wave bands,receivers with serial numbers under 8.263:

LW 2040 - 940m, 147 - 320kc/s
MW 578 - 188 - 520 ~1500 _
FW 194 _ 75 - 1550 - 4000 _
FM 3.4. - 2.8 _ 88 - lOBMc/s

Receivers numbered 8.263 and higher:

LW 2040 - 857m, 147 - 350kc/s
Other bands identical.

. BEOMASTER 900 2

WIRING DIAGRAM FOR FF TRANSFORMERS

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FM Del. 9711-1225

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Page 6

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95 BEOMASTER 900 6

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Mo dific ation, LW Band.

Receivers numbered 3.263 and higher have an LW band covering 147-
350kc/s.They correspond to the circuit diagram on page 3.
Dial glass: Type 760 F 485.

Receivers with serial numbers under 8.263 have an LW band covering
147-320kc/s,and the following components differ from the circuit dia-
gram:
Diagram no. 52 47 pF N 150.
- - 56 GOpF trimmer capacitor.

_ _ rs1 27UpF St.125V.

- - {$4
Dial glass:

180;)1" St. 125 V.
Type 760 F 484.

Power transformer:

Standard version 220 - 240V. ST.3907.

Special version

110 - 220V. ST.3439/2.

220V HOV

::. 240V :' 4 O
220V
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ST 3907 5T3