Philips pm2521 - Page 105

115
7.
MODIFICATIONS
TO
THE PM2521
This
service
manual
is based
on the
instrument
numbers
DM
01
1145 and
onwards.
For
instruments
with
a
lower
number the
following
modifications
are
given.
7.1.
Modifications to
circuit diagrams
and p.c.b.
lay-out
The following
diagrams
must be used:
ACTIVE
FILTER
!
I
Fig. 65.
Modifications
to
active fiiter