Philips PM2521 Service Manual page 70

74
4.2.3.
V
.77
part
4.2.4.
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NOTE
:
THE VOLTAGE ON THE N2
PCB CONNECTOR MUST
BE
MEASURED WITH
A HIGH
IMPEDANCE VOLTMETER
(100MO)
IF
THIS
IS
NOT POSSIBLE
,
TAKE ACCOUNT OF THE SHUNTING
EFFECT
(INPUT
IMPEDANCE PM2521
=
lOMfi
).
NOTE;
MEASUREMENT
ZERO
IS
THE O-SOCKET
OF THE
PM2521
ST342A
820204
SIGNAL
1
PiN
6
AND
7
OF THE
RMS
CONVERTOR
A301
NOTE: OSCILLOSCOPE
IN
POSITION
AC
SIGNAL
2
TP12
NOTE
:
OSCILLOSCOPE
IN
POSITION DC
SIGNAL 2^
NOTE: OSCILLOSCOPE
IN
POSITION
AC
AMPLITUDE NOT IMPORTANT,
'
LOOK ONLY FOR DISTORTION
ST3426
820209
Fig.
47.
Waveforms
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part