TM109902 (5/03) 3-3
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RESTRICTION ON THE TITLE PAGE OF THIS DOCUMENT.
C OMMAND S YSTEMS D IVISION
B. Test equipment with transformerless power supplies should never be used unless an isolation
transformer is used in the ac power line.
C. Some test equipment is designed with a line filter across the ac input. This could result in
accidentally applying 55 volts ac to the semiconductor device. To eliminate this possibility,
always connect a ground wire from the chassis of the test equipment to the chassis of the RT
unit prior to making any other connections.
3.5 CAPACITOR CHECKING
When checking tantalum capacitors, care should be taken to ensure that the maximum DC working
voltage, as marked on the capacitor, is not exceeded and that the polarity markings on the capacitor
are observed when applying voltage. Disregard of polarity markings or exceeding the DC working
voltage may permanently damage the capacitor.
3.6 REPAIR
Voltage dangerous to life exists; remove all
power to unit before proceeding.
A. Repair Precautions
(1) Refer to paragraph 3-6B. for special handling precautions required for electrostatic
discharge sensitive (ESDS) devices.
(2) Perform repairs and replace components with power disconnected from the equipment.
(3) Use a conductive table top for repairs and connect the table to the ground conductor of the
60 Hz power line.
(4) Replace connectors, coaxial cable, shielded conductors, and twisted pairs ONLY with
identical items.
(5) Reference to "component side" of a printed circuit board in this manual means the side on
which the components are located; "solder side" refers to the other side.
(6) When repairing circuits, carefully observe lead dress and component orientation. Keep
leads as short as possible and observe correct repair techniques.
(7) Observe cable routing throughout instrument assembly, prior to disassembly, to enable a
proper reinstallation of the cabling during reassembly procedures.
WARNING
The document reference is online, please check the correspondence between the online documentation and the printed version.
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