Philips pm2521 - Page 145

5
4.
CHECKING
AND
ADJUSTING
•
Disconnect
the
battery power
supply
from the PM2521/22.
•
Remove
the
battery.
•
In its
place,
fit
a
1 kJ2
resistor across
the battery
terminals of
the
power supply
unit.
•
Connect a
voltage
of
+
10V
(20mA)
across points
10
(+)
and
8
(-)
of the
printed-circuit
board.
•
With
preset R105,
adjust
the
voltage across
the external
IkO
resistor to 6,9V.
•
Remove
the 1 k^2
resistor
and
connect a
voltage of
-h
7V
(1
A)
between
the battery
terminals (red= +).
Fit
the
connector XI
01 of
the battery
unit to XI 01
of the
PM2521/22.
•
Switch
on the PM2521
and adjust
the voltage
between points
5
{+)
and
8
{—
)
to
-t-5,0V.
•
Connect a
voltage of 5,5V
across the
battery terminals.
With
preset R301, adjust
the
voltage on point 14 of A401 so
that
the voltage
goes from -5V to -10V
(not
reverse).
•
Remove
the voltage
from the battery
terminals and
refit the battery.
•
Check
the
discharge current
(*=»
700mA).
•
Check the
voltage across C503
is
between
-H2V
and -H5,5V.
•
Check
the
voltage across
C504
is
between
—12V
and —15,5V.
•
Connect
the PM2521/22 to
the mains and
check the charging
current is
between 5mA and
400mA.
5.
PARTS LIST
5.1.
RESISTORS
Ordering
number
Value
(SI) Tol.
(%)
Item
5322
116 55615
20
5%
R101
5322 116
55614 6,49
0,5%
R102
5322
116 55614 6,49
0,5%
R103
5322 116
54502
216
1%
R104
4822 100
10019
220
20%
R105
5322 116
54541 825
1%
R106
5322 116
54696
100K 1%
R201
4822 100
10029
2K2 20%
R301
4822
116 51253
10K 1%
R302
5322
116
50729 4K22
1%
R303
5322
1
1 6
54696
100K
1%
R304.
4822 116
51253
10K
1%
R305
4822
116 51253
10K
1%
R306
5322 116
54651
26K1 1%
R401
5322
116 50506
154
1%
R402
5322 116
50608
6K19
1%
R403
5322
116 50593
16K2
1%
R404
4822 100
10036
4K7 1%
R405
5322 116
54597 5K36
1%
R406
5322
116 50536
464
1%
R501
5322 1 1 6
54632
14K7
1%
R502