Introduction To Circuit Description; Block Diagram Description - Philips PM3055 Service Manual

3-1
3.
INTRODUCTION TO
CIRCUIT DESCRIPTION
AND
BLOCK DIAGRAM
DESCRIPTION
3.1 INTRODUCTION
TO
CIRCUIT DESCRIPTION
The functioning of
the circuits
is
described per printed-circuit board
(p.c.b.). For every p.c.b.
a
separate chapter (4-10)
is
available
containing
the lay out of the
p.c.b., the associated circuit diagram(s)
and the circuit description.
Location
of
electrical parts
The item numbers of
C.
. .
.
,
R.
,
.
. ,
V.,.., N....,
D.
. , .
and
K.
.
.
.
have
been divided
into groups which relate
to
the circuit and
the printed-
circuit board according
to the following
table:
Item number
unit
no. Printed-circuit board
Figure
1000-1999
A1
Attenuator
unit
4
2000-2999
A2 Pre-amplifier unit
5
3000-3999
A3
XYZ amplifier unit
6
4000-4999
A4 Time-base
unit
7
5000-5999
A5 CRT control unit
8
6000-6999
A6
Power supply
9
7000-7999
A7 Front unit
10
8000-8999
A8
LCD unit
10