Tektronix 545A Instruction Manual page 47

PREVENT VE MA NTENANCE
Air Filter
Care must be taken to assure free ventilation of the
Type 545A inasmuch as some of the components are oper ­
ated at dissipation levels such that excessive interior tem ­
peratures will result without adequate air circulation. To
assure free passage of air the instrument must be placed
so that the air intake is not blocked and the filter must be
kept clean. Moreover, the side panels and bottom cover
must be in place for proper air circulation. Do not remove
covers except during maintenance.
A washable EZ KLEEN filter is used at the air intake
port of the instrument. Under normal operating conditions
the filter should be inspected and cleaned if necessary
every three to four months.
required when the operating conditions are more severe.
The following cleaning instructions are issued by the
filter manufacturer:
(1) If grease or dirt load is light, remove filter from
installation and rap gently on hard surface to remove
®2
More frequent inspection is
Fig. 5-1. Location of the fan motor lubrication points.
MA NTENANCE
loose dirt. Flush remaining dirt or grease out of filter
with a stream of hot water or steam.
(2) If load is too heavy for treatment described in (1),
prepare mild soap or detergent solution in pan or
sink deep enough to cover filter when laid flat. Agi ­
tate filter up and down in solution until grease or dirt
is loosened and floated off.
(3) Rinse filter and let dry.
(4) Dip or spray filter with fresh Filter Coat or Handi-
Coater. These products are available from the local
representative of the Research Products Corporation
and from most air conditioner suppliers.
Fan Motor
The fan motor bearings should be lubricated every three
or four months with a few drops of light machine oil (see
Fig. 5-1). Failure to lubricate the bearings periodically will
cause the fan to slow down or stop thereby causing the
instrument to overheat. If your oscilloscope is equipped
with a d c fan motor — modification number 101 — and if
01X1 5
5-1