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BROEL
&
KJ.ER
Ncerum - Denmark
Service Instructions
Automatic Vibration Exciter Control
Consisting of:
Removal of the Case.
Output Amplifier
Oscillator
Pick-up Amplifier
Compressor
M>tor Drive Circuits
Position of Components
Ports list
Circuit Diagram
1008.1
1008.2
1008.3
1008.4
1008.5
1008.6
1008.7
1008.8
1008
After removing the eight HEX/HD screws on the front panel and the two screws in the bottom, it is possible to slide the chassis and
the front panel out of the wooden case.
For rack mounting the metal case can be pulled out after the six HEX/HD screws on the side of the instrument
are
removed
.
Trouble Shooting.
If the reason for a fault is not an obvious one such as a dead tube or transistor, broken down resistor, blown or disconnected
fuse
etc., then first test the voltages of all the tubes and compare them with
the
voltages shown in the circuit
diagram
in order to loca-
lize the defect. Should this method of finding the fault prove unsuccessful, then check the instrument by
adopting
the method de-
scribed in the adjustment procedure. When the trouble has been found and remedied, the voltages and odjustmnets which are influ-
enced by the remedy must be rechecked.
The tolerances stated in the instructions can only be used as a guide for adjustment and control, but any
deviations
must not be cor-
rected 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 M>nual are given purely as a guide to the
service of
equipment with minor faults. Some faults, as f.inst.
small deviations in tolerances require for their correction special control equipment
and
extensive
experience,
and in these cases it
is necessary to send the instrument to the factory.
Spare
Parts.
Please
state type and serial number of apparatus when
spare
parts
are
ordered
.
Instruments necessary for service and repair:
Frequency Analyzer type
2107
Oscilloscope
Frequency
Counter
M.,ltimeter (50
µA)
1008
- 12.66
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