Tektronix 1502 User manual

_ Addendum to the 1502 and 1503 Time Domain Reflectometer Instruction
manuals.
TEKTROND©
WATERTIGHT
SEALING PROCEDURES
for
1502/1503 TIME DOMAIN
REFLECTOMETERS
INSTRUCTION MANUAL
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-2178-00 First Printing JULY 1976

WARRANTY
Tektronix warrants that this product is free from defects in materials
and workmanship. The warranty period is one (1) year from the date
of shipment. Tektronix will, at its option, repair or replace the
product if Tektronix determines it is defective within the warranty
period and if it is returned, freight prepaid, to a service center
designated by Tektronix. .
Tektronix is not obligated to furnish service under this warranty:
a. torepair damage resulting from attempts by personnel other
than Tektronix representatives to install, repair, or service the
product;
b. to repair damage resulting from improper use or from
connecting the product to incompatible equipment;
c. if personnel other than Tektronix representatives modify the
hardware or software.
There is no implied warranty of fitness for a particular purpose.
Tektronix is not liable for consequential damages.
Copyright © 1976 Tektronix, Inc. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are
covered by U.S. and foreign patents and/or pending
patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and Tort are reg-
istered trademarks of Tektronix, Inc. TELEQUIPMENT is
a registered trademark of Tektronix U.K. Limited.
Printed in U.S.A. Specification and price change
privileges are reserved.

REV A JUN 1980
TABLE OF CONTENTS
LIST OF ILLUSTRATIONS
PURPOSE
MATERIALS
SPECIAL TOOLS
ASSEMBLY PROCEDURES
Step 1. Preparation of subpanel for further assembly.
Step 2. Install the holder for the Battery Level Indicator. .
Step 3. Install the seal for the Power Switch.
Step 4. Install washers for the Fuseholders.
Step 5. Install the Pushbutton seals in the Subpanel.
Step 6. Installation of rubber seals in Subpanel grooves.
Step 7. Installation of Implosion shield.
Step 8. Preparation of Frontpanel.
Step 9. Bonding of Plug-in Compartment seal.
Step 10. Bonding of washer to BNC type connector.
Step 11. Install pushbuttons and their shaft assemblies.
Step 12. Attach Subpanel to the three Frame Sections.
Step 13. Install Frontpanel on Subpanel.
Step 14. Install Fuseholders in Frontpanel.
Step 15. Install Fusehoider Caps.
Step 16. Install Battery Meter.
Step 17. Install FOCUS and INTENSITY controls.
Step 18. Install FINE POSITION control.
Step 19. Install! DISTANCE METER.
Step 20. Install ZERO REFERENCE control.
Step 21. Install the Record control.
Step 22. Install the GAIN (1502), or O-dB SET (1503).
Step 23. Partial installation, Main Circuit Board.
Step 24. Install cam switch inserts.
Step 25. Finish installation, Main Circuit Board.
Step 26. Install Power Switch Shaft.
Step 27. Install POSITION and FINE POSITION knobs.
Step 28. Install ZERO REFERENCE knob and CHECK pushbutton.
Step 29. Install FOCUS and INTENSITY knobs.
Step 30. Seal Battery Pack.
Step 31. Frontpanel jacks on X-Y Module.
Step 32. Thumbscrews for X-Y Module.
Step 33. Latch assemblies for Front Cover.
1502/1503 SEALING
Page
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1502/1503 SEALING
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24,
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29,
Figure 30.
Figure 31,
Figure 32.
Figure 33.
Figure 34.
Figure 35.
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+
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LIST OF ILLUSTRATIONS
Subpanel, identification of parts for Steps 1 through 7.
Rubber seals, edge sealing for Subpanel.
Detail of implosion shield sealing.
Front Panel, identification of parts for assembly Steps 8 through 26.
Detail of Plug-In Compartment seal.
Detail of BNC Connector and Washer.
Detail of Pushbuttons and their Shafts.
Detail of Subpanel and screw-hole sealing.
Detail of Fusehoider installation.
Detail of Fushoolder Caps.
Application of sealant to Battery Meter.
Alignment of Battery Meter.
Application of sealant to FOCUS and INTENSITY controls.
Application of sealant to FINE control bushing.
Application of sealant to FINE control nut.
Installation of Distance Meter.
Application of sealant to ZERO REFERENCE control bushing.
Application of sealant to ZERO REFERENCE control nut.
Application of sealant to CAMERA/RECORD toggle-switch bushing.
Application of sealant to CAMERA/RECORD toggle-switch nut.
Installation of rubber Cap-Seal on CAMERA/RECORD toggle-switch.
Application of sealant to the GAIN or the 0-dB SET control bushing.
Detail showing lubrication and sealing for the variable resistor.
Lubrication of the O-rings and sealing for the Cam Switches.
Installation of the POWER SWITCH.
Lubrication of POSITION control knob.
Installation of knob on shaft.
Lubrication of ZERO REFERENCE knob.
installation of knob on ZERO REFERENCE control.
Lubrication of FOCUS and INTENSITY control knobs.
Sealing of Battery Pack screwholes.
Application of dielectric type compound.
Detail of front panel jacks.
Detail of X-Y Module thumbscrews.
Sealing of Latch Assembly screw-holes.

1502/1503 SEALING
PURPOSE
This addendum includes only those assembly procedures that are concerned with
making a 1502 or 1503 a watertight instrument.
MATERIALS
Tektronix Part No. Description Notes _
006-2302-00 Dow Corning No. 3144 This Room Temperature Vulcan-
Adhesive Sealant izing agent (RTV) is used to form
watertight gaskets. (After appli-
006-1171-00 Dow Corning No. 3145 cation, allow 24 hours curing
Adhesive Sealant time.)
252-0199-00 Dow Corning No. 3140 This RTV agent is used where the
Coating application requires a sealant
more fluid than the No. 3144 seal-
ant. (Allow 24 hour curing time.)
006-0315-00 Dow Corning No. 4 This compound is used in the
Silicone Dielectric Battery Pack assembly.
Compound
006-2475-00 Dow Corning No. 1204 Used as a primer for No. 3144
Primer sealant applications.
006-2207-00 General Electric Used as a waterproof lubricant.
No. G-661 Silicone
grease
006-0500-00 Acetone Cleaning Agent.
006-0034-00 lsopropy! Alcohol Cleaning Agent.
REV A JUN 1980

1502/1503 SEALING
ASSEMBLY PROCEDURES
NOTE
In the following assembly steps, the part being discussed is identified by its
Tektronix Part Number (TPN) and its location in the Mechanical Parts List
(MPL) of the Instruction Manuals for the 1502 and 1503. Example, in Step 17
the Front Subpanel is being discussed. In the 1502 manual, the part is
identified as TPN 426-1187-01 and is listed in the MPL under Fig. & Index No.
3-26, In the 1503 manual, the part is identified as TPN 426-1187-02 and is
listed in the MPL under Fig. & Index No. 3-26.
MOUNTING SCREW
IMPLOSION SHIELD
POWER SWITCH SEAL
BATTERY METER HOLDER
OSC)
He
MAIN SEAL
FRONT DISTANCE METER
PUSHBUTTON SEAL
PUSHBUTTON SHAFT
FUSEHOLDER, WASHER
Figure 1. Subpanel, identification of parts for steps 1 through 7. ,

STEP 1.
STEP 2.
STEP 3.
STEP 4.
STEP 5.
1502/1503 SEALING
Preparation
of
the
Subpanel
for
further
assembly
(see
Figure
1)
A.
SUBPANEL,
FRONT
(1) 1502 TPN 426-1187-01, MPL Item 3-26.
(2) 1503 TPN 426-1187-02, MPL Item 3-26.
B. Procedure.
(1) Clean entire Subpanel with isopropyl alcohol.
install
the
Holder
for
the
Battery
Level
Indicator
in
the
Subpanel
A.
HOLDER
(1)
1502
TPN
352-0243-00,
MPL
Item
2-54.
(2)
1503
TPN
352-0243-00,
MPL
Item
2-57.
B.
Procedure.
(1)
Insert
the
holder
into
the
Subpanel.
(2)
This
item
does
not
require
the
application
of
a
sealing
compound
Install
the
seal
for
the
Power
Switch
in
the
Subpanel
A.
SEAL,
SWITCH
(1) 1502 TPN 348-0422-00, MPL Item 2-52.
(2) 1503 TPN 348-0422-00, MPL Item 2-55.
B. Procedure.
(1) Clean mating surface of seal with acetone.
(2)
Coat
mating
surface
of
seal
with
No.
3144
sealant.
(3) Install seal in Subpanel.
install
washers
for
the
Fuseholders
in
the
Subpanel
A.
WASHER,
FLAT
(2
ea.)
(1)
1502
TPN
210-1246-00,
MPL
Item
2-49.
(2)
1503
TPN
210-1246-00,
MPL
Item
2-51.
B.
Procedure.
(1)
Clean
the
washers
with
acetone.
(2)
Coat
the
mating
surfaces
of
the
washers
with
No.
3144
sealant.
(3)
Insert
the
washers
in
the
Subpanel.
install the Pushbutton seals in the Subpanel.
A. SEAL, PUSHBUTTON
(1)
1502
TPN
348-0409-01,
MPL
Item
2-51,
and
TPN
348-0409-03,
MPL
Item 2-50.
(2)
1503
TPN
348-0409-01,
MPL
Item
2-53,
TPN
348-0409-02,
MPL
Item
2-54, and TPN 348-0409-04, MPL Item 2-52.
B. Procedure.
(1)
Clean
mating
surfaces
of
seals
with
acetone.
(2)
Coat
mating
surfaces
with
No.
3144
Sealant.
(3) Install seals in subpanel.

1502/1503 SEALING
G-661
LUBRICANT
FRONT
SIDE
RUBBER Seal (FRONT)
.
Coe
ew
.e
OUTSIDE
EDGE
wet
eg
he
3 & % 3 ,
ses « . . e?
~ sear Be
vo 7 ah
~ ot -," weds
BGs e
Syl
- 5 ca cee ee
NO.
3140
_-~
ey
Reta
he
SEALANT
“
Pty
ey
ye
RUBBER Seal (REAR)
G-661
LUBRICANT
REAR
SIDE
Figure 2. Rubber Seals, edge sealing for subpanel.
STEP 6. Installation of rubber seals in two grooves located on the outer (see
Figures 1 and 2) edges of the front and rear sides of the Subpanel.
A. SEAL, RUBBER (2 ea.)
(1) 1502 TPN 348-0477-00, MPL !tem 2-55.
(2) 1503 TPN 348-0477-00, MPL Item 2-58.
B. Procedure.
(1) Clean the rubber seais with acetone.
(2) Apply a film of No. 3140 sealant to the inner surface of each groove
See Figure 2. Do not apply the sealant to the other surfaces of the
grooves. No. 3140 is more fluid than No. 3144 and can be applied with
a hypodermic type applicator.
(3) Place a seal in each groove. Trim each seal to a length such that its
ends butt together. Apply a film of No. 3140 sealant to the Butt joint.
(4) Before installing the instrument in a cabinet, lubricate the outer
edges of the seals as shown in Figure 2.

REV A JUN 1980
1502/1503 SEALING
NO. 3144
SEALANT
RETAINER
REMOVE EXCESS SEALANT
SN SHIELD
SUBPANEL
Figure
3.
Detail
of
implosion
shield
sealing.
STEP
7.
Install
the
implosion
shield
and
its
retainer
on
the
Subpanel
(see
Figures 1 and 3)
A. SHIELD, IMPLOSION
(1) 1502 TPN 337-2206-00, MPL Item 2-94.
(2) 1503 TPN 337-2206-00, MPL Item 2-91.
B. RETAINER
(1) 1502 TPN 343-0610-00, MPL Item 2-93.
(2) 1503 TPN 343-0610-00, MPL Item 2-90.
C. Procedure.
(1)
Clean
the
retainer
and
the
implosion
shield
mounting
area
of
the
Subpanel with acetone.
(2) Remove the protective paper from the implosion shield.
(3)
Position
the
shield
on
the
Subpanel
and
form
a
continuous
bead
of
No.
3144
sealant,
approximately
.090
inch
in
diameter,
around
the
shield/Subpanel interface.
(4)
Position
the
retainer
over
the
bead
of
sealant
and
press
into
place.
NOTE
(1)
Pressing
the
retainer
should
cause
some
of
the
sealant
to
appear
outside
the
retainer
area,
see
Figure
3.
Failure
of
the
sealant
to
appear
at
any
point
around
the
retainer
is
an
indication
of
inadequate
sealing.
(2)
When
performing
this
step,
assure
that
the
shield
makes
flush
contact
with
the
subpanel,
see
Figure
3.
(5)
After
a
curing
time
of
approximately
4
hours,
use
a
small
wooden
dowel,
such
as
a
Q-tip
handle,
and
remove
the
excess
sealant
that
is
visible
between
the
shield
and
retainer.

1502/1503 SEALING
BATTERY METER PLUG-IN SEAL
POWER SWITCH SHAFT
\ POWER anne
DISTANCE
VARIABLE RESISTOR
FRONT PANEL INSTI: mp/DIV wurt/er
wo © 30 x ss Xt
200 ~ - s
al 2
CABLE vocus rramatry “ . mm, i
CAUTION
abet ir
SECORD
ats 2
s+
-_ =
“¢ ed
| or
1502
CABLE
Be
NN
7.
.
A
=a
BNC
CONNECTOR
CAM
SWITCH
SHAFT INSERT
VARIABLE RESISTOR
VARIABLE RESISTOR
TOGGLE SWITCH
FUSEHOLDER
Figure 4. Front Panel, identification of parts for assembly steps 8 through 26.
STEP 8. Preparation of Front Panel for assembly (see Figure 4)
A. FRONT PANEL
(1) 1502 TPN 333-1991-00, MPL Item 2-47.
(2) 1503 TPN 333-2003-00, MPL Item 2-49.
(3) 1503 Option 5, TPN 333-2123-00, MPL Item 2-49.
B. Procedure.
(1) Clean mating surface of front panel with acetone.
(2) Coat mating surface of panel with No. 1204 primer. Allow 2 hour
curing time.
PANEL
SEAL
NO. 3144 G-661
SEALANT LUBRICANT
Figure. 5. Detail of Plug-in Compartment seal.