Explanation Of Diagram; Component Print And Coordinate System; Control Circuit; Wiring Connections - Bang & Olufsen BeoSound 3000 2671 Service Manual

2.1

Explanation of diagram

Explanation of diagram

Component print and coordinate system

Control circuit

Wiring connections

INTERNAL CONNECTION ON ONE DIAGRAM PAGE
CONNECTION TO ANOTHER DIAGRAM PAGE
Supply Voltages
Ground symbols
Symbol of safety components
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. TR102*.
The largest PCBs have component prints and a coordinate system on both the print
and the component side.
On the diagrams every component has a coordinate number. This indicates in which
coordinate on the PCB 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:
12 20
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 DIAGRAM C
C3
C32
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.
Three different ground symbols are used in the set.
= RF - OSC - SH - IF1 - IF2 - A
= Chassis
= D
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 12
A3
A32