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POWER
PACKS
& CHARGERS
FOR THE 4000 REPORT MODELS
Checking the power pack and charger
of models 880, Z 111
(see Fig. 2 and 4)
Checking the charging circuit
The charging circuit is checked with the aid of a fully
charged Dryfit storage battery.
Insert storage battery in 4000 REPORT, connect charger
to commercial power supply, and establish connection
between charger and 4000 REPORT
with connecting
cable K 713. The button of the charging switch should
pop up within 50 seconds.
Checking the operating circuit
Load operating circuit with the 10-ohm/5 watts resistor.
When a current of 520 to 550 is applied, the voltage
should be from 5.2 to 5.5 volts.
Checking the power pack and charger
of models
Z114, Z115,
Z 116, Z116 S, Z117, Z118
(see Fig. 6, 7, 9 and 10)
Checking the charging circuit for the Z 212 "dryfit PC"
Storage battery
The charging circuit is checked with the aid of a fully
charged Dryfit storage battery as shown in Fig. 1. Con-
nect terminals 1 and 2 of the circuit with terminals 1 and
2 of socket Bu 1 of the charger. Vary rheostat (100 ohms)
of the checking circuit (Fig. 1) so that the voltmeter gives
a reading of 7.4 volts and the amperemeter a current
of about 50 milliamperes. The indicating lamp should
go out.
Adjusting the R 3/250-ohm variable resistor
If the indicating lamp fails to go out at precisely 7.4 volts
during the above checking procedure, its extinguishing
point and hence the cutoff voltage of the charger may
be adjusted to precisely 7.4 volts by varying the R 3/250-
ohm resistor. The resistor is accessible through the
hole "a" in the circuit card of the charger (see Fig. 8).
100 2/0,5 W
_dryfit PC Z 212
Checking the operating circuit
Load the operating circuit with the 10-ohm/5 watts re-
sistor. When
a current of 570 to 600 milliamperes
is
applied, the voltage should be from 5.7 to 6 volts.
Checking the model Z 124
Power Supply Unit and Battery Charger
(see Fig. 11)
Checking the charging circuit for the Z 214
nickel-cadmium storage battery
Bridge the contacts 4 and 5 of the socket of the Z 124.
Connect
a faultless nickel-cadmium
storage
battery
across the bridged contacts 1 and 2 of the socket.
Now, the rheostat R 6 (250 ohms) is ineffective. When a
nickel-cadmium
storage battery is charged, the auto-
matic cut-off device does not work. The signal lamp
must be burning.
Measure the charging current which flows through the
storage baitery; it depends on the charging state of the
storage battery and ranges between 300 milliamperes
at the beginning and 100 milliamperes at the end of the
charging process.
Checking the charging circuit for the Z 212 "dryfit PC"
storage battery
This check must be performed by means of a faultless
and charged "dryfit PC" storage battery according to
fig. 1. The terminals 1 and 2 of the circuit must be con-
nected to the socket contacts 1 and 2 respectively of
the power supply unit and battery charger. The power
supply unit and battery charger must be connected to
the mains.
Set the rheostat R 6 (250 ohms) so that the voltmeter in-
dicates a voltage of 7.4 volts. Thereafter, a charging
current of 50 milliamperes must be adjusted by means
of the rheostat (100 ohms) of the checking circuit (see
Fig. 1). Under this condition, the signal lamp must go out.
Checking the operating circuit
Fig. 1
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