Brüel & Kjær 4911 Service Instructions Manual

BROEL & KJJfR
Ncerum - Denmark
Consisting of :
Removal of Metal Case
Service Instructions
Motion Analyzer
Block Diagram 4911 .1
Electronic Section 4911 .2
Position of Components 4911.3
Parts List 4911.4
Circuit Diagram 4911 .5
4911
After removing the two threaded retainers at the back of the instrument, it is possible to slide the chassis and the front panel out
of the case.
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 correctiO(l 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 e.g. small deviations in
tolerances, require special control equipment and extensive experience to correct. For these cases the instrument must be sent to
the factory .
Voltages at various points throughout the apparatus are indicated on the circuit diagram and the simplified diagram in the service
instruction. These voltages are typical nominals only and, with the exception of stabilized power supply voltages, may vary
considerably from apparatus to apparatus.
Attention
All main capacitors C 1 - C 6 should be discharged by shorting directly across the tags rather than to the chassis, because this
would cause a breakdown of V 112 and V 113.
Spare Parts
Please state type and serial number of apparatus when spare parts are ordered.
4911-6.78