Philips PM2521 Service Manual 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