Maintenance
6-2 2715 Spectrum Analyzer Service Manual
Table6 -1: Relative Susceptibility to Sta tic Discharge Damage
Semiconductor Classes Relative Susceptibility Levels1
MOS or CMOS microcircuits or discretes, or linear
microcircuitswith MOS inputs (most sensitive)
100 to 500 V
ECL 200 to 500 V
Schottky signal diodes 250 V
SchottkyTTL 500 V
High frequency bipolar transistors 400 to 600 V
JFET devices 600 to 800 V
Linear microcircuits 400 to 1000 V
Low power Schottky TTL 900V
TTL (Least Sensitive) 1200 V
Preventive Maintenance
Preventive maintenance consi sts of cleaning, visual inspection , performance check,
and recalibration. The preventivemaintenance schedule that is established for the
instrument should be based on the environmentin which the instrument is operated
and the amount of use. A preventive maintenance checkshould be performed every
2000 hours of instrument operation.
Clean the instrument often enough to preventdust or dirt from accumulating i n or
on it. Accumulation of dirt and greaseacts as a thermal insulating blanket, prevents
efficient heat dissipation, an d provides high resistance leakage paths b etween
conductors or components in a humid environment.
Do not use any cleaning method that would subjectthe internal components to
moisture (wet wash).
Exterior. Clean the dust from the outside of the instrument by wiping or brushing the
surface with a soft clothor small brush. The brush will remove dust from around the
front panel selectorbuttons. Hardened dirt can be removed with a cloth dampened in
water that contains a mild detergent. Abrasivecleaners should not be used.
Interior.C lean the interior by loosening accumulated dust wi th a dry soft brush, then
remove the loosened dirt with low pressure air to blow the dust clear.(High velocity
air can damage somecomponents.) Hardened dirt or grease may be removed with a
cotton tipped applicator dampenedwith a solution of 75% isopropyl alcohol and
rinsed with deionized water.When cleaning front panel buttons use only
1Voltagedischarged from a 100 pF capacitor through a resistance of 100 Ω.

Cleaning