REMOVAL OF THE CASE
Set the oscilloscope face downward on a padded
flat surface, remove the access panel jumper
plugs and the screws in the bottom, then lift
off the case.
CLEANING
CAUTION--REMOVE POWER CORD AND
GROUND HIGH-VOLTAGE CIRCUITS BE
FORE CLEANING IS UNDERTAKEN.
At regular intervals, depending on local condi
tions , the dust should be removed from the in
terior of the Type 511A by means of dry com
pressed air. Avoid a high-velocity air stream
which might injure the instrument or disturb
adjustments. Persistent dirt may be removed
with a lint-free cloth, or a small paint brush.
Special attention should be given to the high
voltage circuits, including parts under the high
voltage cover shields, as excessive dust and
moisture may cause arcing.
Under normal conditions, the silver-plated
contacts of the rotary switches should not require
special attention. In case they become tarnished,
the contacts should be cleaned by rotating the
switch several times.
INSPECTION
A visual inspection is desirable while the Type
511A case is removed during cleaning.
1. Switches. Turn the rotary switches while
observing the contacts, to check contact center
ing in each index position. Improperly centered
contacts may be due to the switch becoming
warped or twisted, or in the case of S2 (SWEEP
RANGE), to a loose shaft coupling.
CAUTION--AVOID PRESSURE ON THE
CONTACTS AS THEY ARE EASILY DAM
AGED.
2. Capacitors and Resistors. Inspect the oil-
filled and electrolytic capacitors for leakage of
oil or electrolyte, replacing if necessary. The
wax coating of paper-tubular-capacitors may
drip if the instrument has been overheated by
operating in a restricted space. This condition
usually does not indicate replacement. Com
position resistors should be checked for serious
discoloration, which would indicate excessive
dissipation and therefore faulty operation. A
moderate amount of discoloration is normal.
3. Connections. Loose screws or nuts should
be tightened. This is especially important when
the screw serves as an electrical connection.
Corrosion of the chassis and electronic com
ponents is unlikely under normal conditions.
It should be removed if evident, and the cause
corrected. If the instrument must be operated
in a corrosive atmosphere, it may be desirable
to remove the tubes occasionally and clean the
contact pins with crocus cloth. Remove and in
sert the tubes several times to clean socket
contacts.
4. Voltages (S/N455 and up). The power-
supply output voltages, -140, + 225, +450, -1500
and +1500 should be checked with an accurate
voltmeter. To check the voltage regulator cir
cuits, vary the line voltage by means of a
variable transformer, and with a voltmeter
observe the regulation limits of the -140 v,
+ 225 v and +450 v supplies. Compared to
their value at a 117-volt line, the output voltages
should be within these limits:
Supply
-140 (+2-5%) +225(12%) +450(16%)
105 v line -0.5%
-1%
-1%
125vline +0.5%
+1%
+1%
CAUTION---DO NOT EXCEED A LINE
VOLTAGE OF 130.
TROUBLE ANALYZING AND REPAIR
(S/N101 and up)
General
It is important that the operation, circuit
theory and physical location of components be
thoroughly understood before repair of the Type
511A is undertaken. If the circuit description,
schematic diagram and interior photographs are
carefully studied, most defects will be found
relatively easy to locate.
CAUTION-BE SURE TO CHECK THE
SETTING AND ADJUSTMENT OF THE
CONTROLS BEFORE ATTEMPTING RE
PAIR, TO VERIFY THAT THE DIFFICUL
TY IS ACTUAL.
Although tables of average voltage and resis
tance values are included to facilitate servicing.
P A G E 4 - 2
T Y P E 5 1 1 - M A I N T E N A N C E
Summary of Contents for 511
Page 1: ......
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Page 26: ......
Page 52: ......
Page 58: ...Fig 5 6 Interior view right front side S N 845 1405 TYPE 511 A 511 AD SECTION 4 PAGE 22 ...
Page 60: ......
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Page 62: ......
Page 63: ......
Page 66: ...Fig 5 14 Video Amplifier top S N845 1459 Fig 5 15 Video Amplifier bottom S N845 1459 ...
Page 68: ...Fig 5 18 Power Supply bottom view S N 845 1629 Fig 5 19 P ow er Supply top view S N 845 1629 ...
Page 72: ...DEGREES OF PHASE SHIFT Fig 5 27 SN 845 and up TEKTRONIX INC 12 28 50 ...
Page 97: ......
Page 98: ......
Page 101: ...AA ...
Page 102: ...SWEEP MAGNIFIER SWEEP AMPLIFIER c r r c r r s c ...
Page 105: ...TYPE 5IIAD CATHODE RAY OSCILLOSCOPE S N 2406 4 UP A A ...
Page 106: ... 2 2 5 V VERTICAL AMPLIFIER ...
Page 107: ...TYPE 511 CATHODE RAY OSCILLOSCOPE S N 101 454 AA POWER SUPPLY ...
Page 108: ...TO S7 3 A 6 6 117 V 60 APR 1949 S N 455 2405 A A ...
Page 111: ...4 A A C n o c n n r ...
Page 113: ......