AR 10051217, Operating And Service Manual

Page: 79 / 90

Rev A 55
4. MAINTENANCE
4.1 GENERAL MAINTENANCE INFORMATION
The Model 2000S1G2z8 requires very little maintenance since it is a relatively simple instrument. It is built
with etched circuit wiring and solid-state devices that will ensure long, trouble-free life; however, should trouble
occur, special care must be taken in servicing to avoid damage to the devices or the etched circuit board.
Since the components are soldered in place, substitution of components should not be resorted to unless there
is some indication that they are faulty. In addition, take care when troubleshooting, not to short voltages across
the amplifier. Small bias changes may ruin the amplifier due to excessive dissipation or transients.
Components in AR instruments are conservatively operated to provide maximum instrument reliability. In spite
of this, parts within an instrument may fail. Usually, the instrument must be immediately repaired with a
minimum of down time. A systematic approach can greatly simplify and, thereby, speed up the repair.
However, due to the importance of the amplifier's alignment, it is recommended that when failure is caused by
breakdown of any of the components in the signal circuits, the amplifier be returned to the factory for part
replacement and amplifier realignment. Shipping instructions are as follows.
To return an item, contact AR Customer Service for an RMA number and shipping instructions. Returns from
outside the United States are not permitted without prior authorization. If shipping from outside of the United
States, closely follow all directions on the RMA form for return shipping and marking. See warranty statement
at rear of manual.
4.2 DISASSEMBLY PROCEDURE
CAUTION:
Extreme caution should be exercised when troubleshooting this unit,
particularly when measuring voltages in the power supply section of the
unit. Hazardous voltages do exist in the unit that could cause serious injury
to any personnel performing the measurements.
The enclosure and amplifier top cover can be removed to gain access to the power supplies and AC entry
components along with remote interfaces. The enclosure and amplifier side panels can be removed to gain
access to final modules and power supplies. The power combiner and combiner/splitter can be accessed through
both side access panels.
Left side – A1 pre-amp A6, A9-A12 driver modules, A25-A40 final modules, PS1, PS2
Right side – A3, A5, A13-A16 driver modules, A41-A56 final modules.
Both side panels must be removed to replace power supplies PS3 through PS9.