Tektronix 585 - Page 47

MAINTENANCE
v
General
This section of the Type 585 Manual contains information
regarding Preventive Maintenance, Soldering, Removal and
Replacement of Parts, and Troubleshooting information.
It is through use of the Troubleshooting information and the
Calibration Procedure that practically all troubles can be
corrected, allowing continuing operation of the oscilloscope.
PREVENTIVE MAINTENANCE
Air Filter
Care must be taken to assure free ventilation for the Type
585 in order to prevent instrument overheating. To assure
free passage of air, the instrument must be placed so 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 the covers
except during maintenance.
A washable "E-Z KLEEN" filter is used at the air intake
for the instrument. Under normal operating conditions
the filter should be inspected, and cleaned if necessary,
every three to four months. More frequent inspection is re 
quired when the operating conditions are more severe.
(See the Accessories Section of this manual for disposable
air filters).
The following cleaning instructions are issued by the filter
manufacturer:
(1) If grease or dirt load is light, remove filter from installa 
tion and rap gently on hard surface to remove loose dirt.
Flush remaining dirt or grease out of filter with a gentle
stream of hot water or steam; flush from clean side.
(2) If load is too heavy for treatment described in (1), pre 
pare mild soap or detergent solution in pan or sink deep
enough to cover filter when laid flat. Agitate filter up and
down in solution until grease or dirt is loosened and floated
off.
(3) Rinse filter and let dry.
(4) Spray the filter with fresh Filter Coat (Tek Part Number
006-580) or Handi-Coater. Let dry from 2 hours to over 
night before reinstalling . These products are available from
the local representative of the Research Products Corpora 
tion, and some air-conditioner suppliers.
(5) Use of oil or kerosene not recommended.
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 it
operates throughout the working day, we suggest that you
oil the bearings lightly once a month.
You should check the condition of the brushes of d c fans
every other month since their life expectancy is approxi 
mately six months under conditions of daily use.
Fig. 5-1. Location of fan motor lubrication points.
Recalibration
The Type 585 is a stable instrument and will provide many
hours of trouble-free operation. To insure the reliability of
measurements obtained we suggest that its calibration be
checked after each 500 hours of operation, or at least every
six months if used intermittently. A check of the calibration
also provides a means for checking the operation of each
circuit. Minor operational deficiencies that are not appar 
ent in normal use are often detected during a calibration
check.
5-1