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BROEL & KJ.ER
Ne2rum - Denmark
Consisting of:
How to Open the Metal Case
Service Instructions
Microphone PolNer Supply
Electronic Section
Position of Components
Parts list
Circu it Diagram
2804.1
2804.2
2804.3
2804.4
2804
Tum the thumb screw on the front plate anti-clockwise. The bottom plate
can
then be slid backwards and removed.
Unscrew the two 3 mm screws on the back plate. The two side plates can then be slid backwards and removed.
Battery Change
Unscrew the upper 3 mm screw on the back plate and slid
the
top plate
backwards.
The batteries can then easily be
changed.
Trouble Shooting
If any problems should occur with this
instrument,
then first check the DC working voltages from the Power
Supply.
Then use the
Block Diagram in order to localize the trouble to be
located
in one specific circuit.
When a fault has been found and corrected, the voltages and adjustment which are influenzed by the correction must be rechecked,
and the instrument controlled to see if all
basic
functions are fulfilled
.
The tolerances stated in the
instructions
can only be used as a guide for adjustment and control.
Any deviations must not be corrected without being sure, that the tolerances, of the instruments used for making the adjustment, are
so small as to have no
influence
on the
measurements.
The
instructions in this Manual are given purely as a guide to the service of the
equipment.
Some faults, as for example, small
deviations in tolerances require for their corrections special control equipment and extensive experience,and in these cases it is
necessary to send the instrument to the
factory.
Voltages at various points throughout the apparatus are indicated on the circuit diagram and the simplified diagram in the service
instructions. These voltages are typical nominals only and with the exception of stabilized power supply voltages, may vary
considerably from apparatus to apparatus.
Spare Parts
Please state serial number of apparatus when spare parts are
ordered.
2804
·
9.79
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