20- 1
EXPLANATION OF DIAGRAM
Position nos. for the
components
Coordinate system
Control circuit
Wiring connections
INTERNAL CONNECTION ON ONE
DIAGRAM PAGE
CONNECTION TO ANOTHER
DIAGRAM PAGE
Supply Voltages
Symbol of safety
components
ill
20- 1
EXPLANATION OF DIAGRAM
Type numbers of transistors and ICs are indicated on the diagrams. If the
position is followed by an asterisk the spare part number must always be
used because the component in question has been specially selected, e.g.
7104*.
1XXX Crystals, fuses, filters etc.
2XXX Capacitors
3XXX Resistors
4XXX SMD-jumpers
SXXX Coils, transformers and liks
6XXX Diodes
70XX transistors
71XX IC's
On the diagrams every component has a coordinate number. This
indicates in which coordinate on the PCB component drawing the
component is situated. The coordinate numbers are written in smaller
print types than the position numbers.
In certain control circuits the active mode is indicated by a function term
or by an abbreviation. This may be e.g.
ST.BY.
=
low in the stand-by mode
or ST.BY.
=
high in the stand-by mode.
The wiring connections on the diagrams are assembled in 'bundles'. The
individual wires are provided with one of the following codes:
I
I
I
I
12
20
20
12
Internal connections on a diagram page are indicated by a number.
The bend of the wire indicates in wich direction the other end of the
wire is found.
DIAGRAM A
I
C3
C32
DIAGRAM C
I
A32
A3
A connection to another diagram page is indicated by a number as well
as by a letter of the diagram to which the connection leads.
All supply voltages in the diagrams are indicated by an arrow and a
voltage indication. 7 con. means 7 connections.
When replacing components with this symbol, components with
identical part numbers must be used. The new component must be
mounted in the same way as the one replaced.
20-1
EXPLANATION OF DIAGRAM
Measuring conditions
Explanation of the fuse
symboles used in the set
Explanation des symboles de
fusible utilises dans l'appareil
Bang & Olufsen
All DC voltages have been measured in relation to ground with a
voltmeter with an input impedance of 10 Mohms.
The DC voltages are stated in volts (V), e.g. 0.7V.
All oscillograms and AC voltages have been measured in relation to
ground with an oscilloscope or a voltmeter with an input resistance of
1Mohm.
AC voltages are stated in millivolts (mV), e.g. 660mV.
Replace with the same type 200m ampere 32 volts slow acting fuse.
Remplacer par un fusible retarde de meme type et de 200m amperes 32
volts.
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