Harris SX-1 User manual

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~
TECHNICAL MANUAL
SX-1 AM TRANSMITTER
MAINTENANCE MANUAL
994 8581 001
994 8581 003
IJHARRIS
T.M. No. 888-2126-028
@ Copyright HARRIS CORPORATION
1983 All Rights Reserved
Printed : De cember 01, 1983

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REV. II
024
022
025
023
020
021
026
DATE
09/16/83
09-29-83
09-30-83
10-04-83
10-07-83
10-13-83
MANUAL REVISION HISTORY
SX-1 AM TRANSMITTER MAINTENANCE MANUAL
888-2126-xxx
ECN PAGES AFFECTED
27667A Replaced the following pages:
Title Page, 2-2, 7-2, 7-6, 7-20, 7-21, 7-86, 7-87
& 7-88, 7-89/7-90, 8-1 & 8-2, 8-15/8-16, 8-75/8-76
Added Manual Revision History Page
27736
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Title Page, Manual Revision History Page, 7-15 &
7-16 and 7-65 & 7-66
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Title Page, Manual Revision History Page, 7-3,
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27738 Replaced the following pages:
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10-31-83 27770 Replaced the following pages:
Title Page, Manual Revision History Page
iv thru xvi
2-6, 2-7 & 2-8
All of Sections IV, V, and VII
Added the following:
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027 11-14-83 27779 Replaced the following pages:
Title Page, Manual Revision History Page
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028 12-01-83 27800 Replaced the following pages:
Title Page, Manual Revision History Page
xv/xvi, 8-2
Added the following pages:
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888-2126-028

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WARNING
THE CURRENTS AND VOLTAGES IN THIS EQUIPMENT ARE
DANGEROUS. PERSONNEL MUST AT ALL TIMES OBSERVE
SAFETY REGULATIONS.
This manual is intended as a general guide for trained and qualified personnel
who are aware of the dangers inherent in handling potentially hazardous
electrical/electronic circuits. It is not intended to contain a complete
statement of all safety precautions which should be observed by personnel in
using this or other electronic equipment .
The
installation, operation, maintenance and service of this equipment
involves risks both to personnel and equipment, and must be performed only by
qualified personnel exercising due care. HARRIS CORPORATION shall not be
responsible for injury or damage resulting from improper procedures or from
the use of improperly trained or inexperienced personnel performing such tasks.
During installation and operation of this equipment, local building codes and
fire protection standards must be observed. The following National Fire
Protection Association (NFPA) standards are recommended as references:
- Automatic Fire Detectors, No . 72E
-
Installation, Maintenance, and Use of Portable Fire Extinguishers,
No. 10
- Halogenated Fire Extinguishing Agent Systems, No. 12A
WARNING
ALWAYS DISCONNECT POWER BEFORE OPENING COVERS,
DOORS, ENCLOSURES, GATES, PANELS OR SHIELDS.
ALWAYS USE GROUNDING STICKS AND SHORT OUT HIGH
VOLTAGE POINTS BEFORE SERVICING. NEVER MAKE
INTERNAL ADJUSTMENTS, PERFORM MAINTENANCE OR
SERVICE WHEN ALONE OR WHEN FATIGUED.
Do not remove, short-circuit or tamper with interlock switches on access
covers, doors, enclosures, gates, panels or shields . Keep away from live
circuits, know your equipment and don't take chances.
WARNING
IN CASE OF EMERGENCY ENSURE THAT POWER HAS BEEN
DISCONNECTED.
888-2126-001 i

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Treatment
of
Electrical
Shock
ii
1.
If
victim
is
not
responsive
follow
the
A-B-Cs
of
basic
life
suppo
rt
.
PLACE
VICTIM
FLAT
ON
HIS
BACK
ON
A
HARD
SURFA
CE
@
AIRWAY
IF
UNCONSCIOUS
,
OPEN
AIRWAY
LIFT
UP
NECK
PUSH
FOREHEAD
BACK
CLEAR
OUT
MOUTH
IF
NECESSARY
OBSERVE
FOR
BREATHING
CHECK
CAROTID
PULSE
IF
PULSE
ABSENT,
BEGIN
ARTIFICIAL
CIRCULATION
©CIRCULATION
®
BREATHING
IF
NOT
BREATHING,
BEGIN
ARTIFICIAL
BREATHING
TILT
HEAD
PINCH
NOSTRILS
MAKE
AIRTIGHT
SEAL
4
QUICK
FULL
BREATHS
REMEMBER
MOUTH
TO
MOUTH
RESUSCITATION
MUST
BE
C
OMMEN
C
ED
AS
SOON
AS
POSSIBLE
DEPRESS
STERNUM
1 112•
TO
2•
{
ONE
RESCUER
APPROX.
15
COMPRESSIONS
BO
SEC.
2
QUICK
BREATHS
APPRDX.
1
rT\t/O
RESCUERS
60
SEC
5
COMPRESSIONS
. 1
BREATH
NOT
E:
DO
NOT
INTERRUPT
RHYTHM
OF
COMPRESSIONS
WHEN
SECON
D
PERSON
IS
GIVING
BREAHI
Call
for
medical
assistance
as
soon
as
possible.
2.
If
victim
is
responsive.
a.
keep
them
warm
b.
keep
th
em
as
quiet
as
possible
c.
loosen
their
clothing
(a
recli
ning
position
is
recommended)
888-2126-001
,--....

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~
FIRST-AID
Personnel
engaged
in
the
installation,
operation,
maintenance
or
servicing
of
this
equipment
are
urged
to
become
familiar
with
first-aid
theory
and
practices.
The
following
information
is
not
intended
to
be
complete
first-aid
procedures,
it
is
brief
and
is
only
to
be
used
as
a
reference.
It
is
the
duty
of
all
personnel
using
the
equipment
to
be
prepared
to
give
adequate
Emergency
First
Aid
and
thereby
prevent
avoidable
loss
of
life.
Treatment
of
Electrical
Burns
1.
Extensive
burned
and
broken
skin
a.
Cover
area
with
clean
sheet
or
cloth.
(Cleanest
available
cloth
article.)
b.
Do
not
break
blisters,
remove
tissue,
remove
adhered
particles
of
clothing,
or
apply
any
salve
or
ointment.
c.
Treat
victim
for
shock
as
required.
d.
Arrange
transportation
to
a
hospital
as
quickly
as
possible.
e.
If
arms
or
legs
are
affected
keep
them
elevated.
NOTE
If
medical
help
will
not
be
available
within
an
hour
and
the
victim
is
conscious
and
not
vomiting,
give
him
a weak
solution
of
salt
and
soda:
1
level
teaspoonful
of
salt
and
1/2
level
teaspoonful
of
baking
soda
to
each
quart
of
water
(neither
hot
or
cold).
Allow
victim
to
sip
slowly
about
4
ounces
(a
half
of
glass)
over
a
period
of
15
minutes.
Discontinue
fluid
if
vomiting
occurs.
(Do
not
give
alcohol.)
2.
Less
severe
burns
-
(1st
& 2nd
degree)
a.
Apply
cool
(not
ice
cold)
compresses
using
the
cleanest
available
cloth
article.
b.
Do
not
break
blisters,
remove
tissue,
remove
adhered
particles
of
clothing,
or
apply
salve
or
ointment.
c.
Apply
clean
dry
dressing
if
necessary.
d.
Treat
victim
for
shock
as
required.
e.
Arrange
transportation
to
a
hospital
as
quickly
as
possible.
f.
If
arms
or
legs
are
affected
keep
them
elevated.
REFERENCE:
ILLINOIS
HEART
ASSOCIATION
AMERICAN
RED
CROSS
STANDARD
FIRST
AID
AND
PERSONAL
SAFETY
MANUAL
(SECOND
EDITION)
888-2126-001
iii

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iv
TABLE OF CONTENTS
SECTION I. GENERAL INFORMATION
Introduction ..•...•.•...•.......•..........•..................
Scope And Purpose
...........................................
SECTION II.
OPERATION
Introduction
..................................................
SECTION III.
EMERGENCY OPERATING PROCEDURES
Introduction ......•..................................••••..•..
Emergency Operating Procedures For SX Transmitters••••·•••··
VSWR Protection
.............................................
Power Amplifier Failure
.....................................
PDM Amplifier Module Failure
.. .. ............................
........................................
Power Supply Failure
Crystal Failure
.............................................
System Controller Board Failure
.............................
SECTION IV.
MAINTENANCE
Introduction
..................................................
Station Records ...................... . ...................•....
Maintenance Logbook·••·•·······••••· ··· ·····••••······••••• ·
Preventive Maintenance•······•••••••· · ····••••••····••••·•·•··
Maintenance Of Components····•• •· ·········••••····•••••···••
Transistors .••.....•.........•...•.••..••......•.•••.•....
Integrated Circuits
. ... .. .................................
Capacitors
. ..... ... .......................................
...........................................
Fixed Resistors
Variable Resistors
. ...................................... .
..... . ........ .......................................
Fuses
Switches
..................................................
Indicators And Indicator Switches
.........................
Toroids
................................................. ... .
Printed-Circuit Boards
...... ..............................
Air System ................................................
Using The Keypad And Display Unit
.............................
....................................
Basic Control And Status
Status/Fault Display
................ .... ..................
Supply Voltage .
.......................................... .
.............. .. ......................
Power Supply Current
Forward/Reflected Power ...................................
PA
PA
Current
Voltage
................................................
................................................
IPA Drive Level
............................... .... ....... .
Fuse Finder •.•.... .... .•..•.......................••.••..•
Temperature Readings·••••••··••••·••••••···••···••·••·••••
PDM Amp Trans is tors .••• ••• •.• • ••.••••••••••••..••• ••• •••.•
Phase Angle Detector••·•••••··••••••···••••··•••··••••····
Power Level Settings .••.•••..•...••••..•..•..••...•..•• ..•
888-2126-026
WARNING:
Disconnect primary power prior to servicing.
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TABLE OF CONTENTS (Continued)
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Internal References•••••••••••·•••••••·••••····•·•·•·•••••
Testing The Display Segments··•••••••••••·····••••••••••••
Corrective Maintenance And Adjustment Procedures ••••••••••••••
Replacing Boards and Replacing Board Components····•••••••··
IPA Module •.•••••••.••••••.•••.•...• • .••••••••......•.••..••
PA Module ••••••••••••.•••••••••••.••••••••••••••••.•.••.• •• •
PDM Amplifiers
..............................................
RFI Board A24 .••.•...••.•.......••..•..........•............
RF Oscillator A16
...........................................
PDM Genera tor A15 ••••••••••••••••••••••••••••••••••••••.••••
Directional Coupler A18 •••••·· · ·••••••··••••••·••••·•·•·•···
Phase Angle Detector A27Al ••••••••••••••••••••••••••••••••••
AC Controller Board A25 •···•••••······••··••••••••••••••••••
Check The 5 Volt Supply ••••••••••••.••••••••••••••• • ••••••
Check Plus And Minus 15 Volts••••••••• ••• ·•··•••·•••••··•·
Status and Multimeter Board A12 ······•·•••••••••••••·•••••·•
Setting Up The Optional Frequency Synthesizer•••••••••••••••
Setting The Band Switches • •• •••••••••••••••••• • •••••••••••
Programming The Frequency Synthesizer•••••••••••••••••••••
Aligning The PDM Generator·••··········• · ··••··•·••••·••·••·
Adjustment Of Directional Coupler•·•·••••••••••••·······•···
Adjustment Of Phase Angle Detector•••••••••••••••••••••• • •••
Output Network Cold Tuning•• •• •···········•••·•·••• • ••••••·•
Third Harmonic Trap L7-C4 ••••• ••••••••••••••••••••••••••••
Bandpass Filter L2-C2 ••••••••••·············••···••••••••·
Tee Network -Load And Tune•·•••··••••••••••••••••••·•··• •
L2 Sliding Tap ......................•....... . ...........•.
11 Tap ....................................................
Meter Calibration Procedure
............................. .. ..
Mechanical Zeroing ••••.••••••••• • ••••• • •• • ••••••••••••••••
Forward/Reflected Power ••.••.••.• • •• . ••.•..•• .• • • ••.•• • •••
PA Volts ....... ... .. .. .. .. . ....... ....................... .
PA Amps •••••••••••••••••••••••••••••••••••••••••••••••••••
Power Supply Current Calibration •• •••••••••• • •.•••.•••••••
Overload Adjustment Procedures ••••••••••••••••••••••••••••••••
R55 Overvoltage (Status Indication "1") ••····•·•·•····•·••··
R54 Power Supply Current (Status Indication "16") And
R57 PA Current (Status Indication "2") ••••••••••••••••••••••
R58 Underdrive (Status Indication "4") ••••••••••••••••••••••
R56 Overdrive (Status Indication "8")
R51 VSWR - Reflected Power (Status Indication "32") • •• •• • •••
R53 VSWR - Phase Angle Detector (Status Indication "64")
Tuning Procedure ........... . ............. . .... . .... . ......... .
IPA Tuning Procedure
Tuning And Loading Controls•••••••••••···•·•··•··•• • •·••••••
Adjusting The Modulation Monitor Sample Output ••••••••••••••••
SX-1 Top Removal Procedure . . . .... . . .. . ....••..................
Technical Assistance
..........................................
888-2126-026
WARNING:
Disconnect primary power prior to servicing.
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V

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vi
TABLE OF CONTENTS (Continued)
SECTION V. TROUBLESHOOTING
Introduction ..................................................
Initial Troubleshooting•••••••••••••••••••·••••••·••••••••••••
Symptom: Transmitter Will Not Turn On - No Control
Buttons Are Illuminated•••••••••••••••••••••••••••••••••••••
Passi ble Causes ....•........................•.....•.....•.
Loss Of AC Power ••••••••••••••••••••••••••• •••• •• •••• •••
Loss Of Plus Or Minus 15 Volts••••••••••••••••••••••••••
System Controller Locked Out···•••••••••••••••••••••••••
Loose Ribbon Connectors······••·•••·•······•••••••••••••
Single System Controller Malfunction ••••••••••••••••••••
Symptom: Transmitter Will Not Turn On - Fault Lamp
Illuminated .................................... •...... ...•..
Possible Causes····••·•···········•···•••••••··•••••·•••••
Fault Status •................•.•...........•..•.•.......
Symptom: Low, Med Or High Pushbutton Indicators Illuminated
But Contactors Do Not Energize. No Fault Lamp Illuminated
Or Status Indicated··•••••····••···•••••••···•••••••••···•••
Possible Causes ......••.•........•...••.•••.•••...........
Open Door ••.•••••••••••••••••••••••• o •••••••••••••••••••
Failsafe Interlock Open •••••••••••••••••••••••••••••••••
Fuse Open •••••••••••••••••••••••••••••••••••••••••••••••
AC Voltages On A25 .••...••••..•..••••.•.•.••••...••••.•.
Open Contactor Coil••••••·•·•• • •••••••••·····•••••·····•
Symptom: Transmitter Fault Light Illuminated. Raise
Light Illuminated. All Three Panel Meters Indicate Up
Scale Approximately 1/8 And Are Oscillating. Position
00 On Keypad Shows 32, 64, or 96 ••••••••••••••••••••••• •• •··
Possible Causes••••••·••••••·•··•••····••············•···•
Transmitter Grossly Mistuned Or Antenna Problem • ••••••••
RF Contactor Or Transmission Line Connector Failure •••••
Acorn Arc Gap Above Loading Control••·•••••···••···••·••
Output Tuning Or Loading Control Defective ••••••••••••••
Burnt Or Loose Connections In Output Network ••••••••••••
Phase Angle Detector Cable Bad Or Disconnected ••••••••••
Glass Arc Gap On Directional Coupler Board ••••••••••••••
Symptom: Transmitter May Or May Not Be Able To Be Turned
On. The Digital Display May Be Garbled. The Transmitter
May Want To Perform An "ON" Function By Itself ••••••••••••••
Possible Causes ·· ·······•••·····•• • •••·•••···••·······••··
Power Supply Voltages On Status And Multimeter Board ••••
Ribbon Cable Connections··••••••·•·•••·•••••••••••·•••••
System Controller Board··•·····••·· · ·•·•·•••••••••••••••
Status And Multimeter Board ••••.•••••••••••• •• •••• ••••••
Symptom: Transmitter Operates Normally But All Digital
Display Voltages Read Incorrectly•••••••·••••••••·••••••••• •
Possible Causes·•·••••···•··••••••••••••••••••••••••••••••
U40, The Analog To Digital Converter Is Bad··•••··••••••
888-2126-026
WARNING: Disconnect primary power p rior to servicing.
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www.SteamPoweredRadio.Com
Paragr a ph
5- 45.
5-46.
5-47.
5-48.
5-49.
5- 50.
5- 54.
TABLE OF CONTENTS (Continued)
U38, lOV Reference•••••••••••••••••••••••••••••••• • ••••• 5-7
Q31, Q30, U40's Voltage Regulators•·•••••••••••••••••·•• 5- 7
U57 Analog Buffer•••••••·•··••••••····•••••••••••·•····· 5- 7
Symptom: Transmitter Shuts Off Immediately Af ter Turn On ,
Contactors Click Or Chatter Or Drop Out Intermittently •••••• 5-7
Possible Causes ••••••••••••••••••••••••••••••••••••••••••• 5- 7
Fault Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . 5- 7
Symptom: Transmitter Stays On (Contactors Energize d ),
But No Power Output And High Voltage Supply May Or May
Not Be On . • • . . . . . . . . . . . . . . . . . . . . . . . • • . . . . . • . . . . . • . • • • • • • • . . • 5- 7
Symptom: Remote Control Functions Do Not Wo r k•••••••••••••• 5-8
Possible Causes•·•••••••••·••• • •·•••••••••••••••••••••••·• 5-8
REMOTE/LOCAL Switch ••••••••••••••••••••••••••••••••••••• 5- 8
Remote
Control Improperly Wired•··•···············•••••• 5-8
Remote Control Unit Not Functioning·••••••••••••••·••••• 5-8
Loss Of +10 Volts•··••••••···•••••••••••••·•·····••••• · • 5-8
Ribbon Connectors Loose .••.•..•••.•••.•••••.••.•.••.••.• 5 -8
Optical Isolator Failure••••••••··••••••••···••·•••••••• 5 -8
Troubleshooting A 5 Volt Supply Failure··•••••••••• •• ··•••·· 5-8
5-56.
5-5 7.
5- 58.
5- 5 9.
5- 60.
5-61.
5 -62.
5- 63.
5- 64.
S-76.
5 -77.
5- 78.
5- 81.
5- 83 .
5- 84.
5- 86.
S- 87.
5-88.
Possible Causes for Overloads ••••••••••••••••••••••••••••••••• 5 -10
5-89.
5-92 .
5-95.
5- 96.
5- 97.
5-99.
5- 100.
5- 101.
5- 105.
5- 106.
5-111.
5-114.
5-116.
5- 118.
5- 120.
Fault Status Indication "l", Power Supply Volt a ge ••••••••••• 5-1 0
Supply Voltage Too High••••••••••••• •••• ••• • •••••••• • •• ••• 5- 10
Overloads Without The High Voltage On ••••••••••••••••••••• 5- 10
Fault Status "2", PA Current Overload ••••••••••••••••••••••• 5- 10
Random Trips With Audio••·••·•··········•••••••••••••• •• ·• 5-10
PA Current Over l oads At Turn On ••••••••••••••••••••••••••• 5 -1 1
PA Current Overloads, Continuous Cycling •••••••••••••••••• 5 -11
PA Current Overloads Without The High Voltage On •••••••••• 5- 11
Fault Statu s Indication "4", Underdrive ••••••••••••••••••••• 5- 11
Fault Status Indication "8", Overdrive····••·····••·•··•••· · 5-11
Fault Status Indication "16", Power Supply Current
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . • . . 5- 12
Random Trips With Audio••••••••••••••••••··•· · •·•••·•····· 5-12
Shorted Damper Diode ....................................•. 5- 12
Mechanical Failure Of Safety Shorting Switche s On Doors ••• 5- 12
Shorted B+ Filter Capacitor (May Only Short Out Whe n
HV Is Applied) .... .. ................. .. . .. ........ .. ..... . 5-12
Modul ator Efficiency•·•••••••••••••••••••••••••••••••••••• 5 -1 3
Fault Status Indication "32", VSWR (Directional Co upl er
Reflected Sample) ·•· · ·•··· • •••••••·••····•••••·•·••••••••••• 5- 13
Trips Occur With High Levels Of Modulation And High
Power ....... •... ............ . .•..........................• 5-13
Continuous Cycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5- 14
Fault Status Indication "64", VSWR (Phase Angle Dete c tor
Output) ......................•.....•.....•••.••••....••. • •.. 5- 14
Continuous Cycling, No Power Out •••••••••••• • ••••••••••••• 5 -1 4
Fault Status Indication "96", VSWR (Both VSWR Sensors) •••••• 5- 15
Handling MOSFETS . . . . . . •• • . . • . • • •• • • •. . . •• •• • • •• • • •• •• •• •• • • • 5- 15
888-2126 - 026 vii
WARNING: Disconnect primary power prior to servicing .

www.SteamPoweredRadio.Com
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5-
172.
5-173.
5-174
.
5-175.
5-176.
5-177.
5-178.
TABLE
OF
CONTENTS
(Continued)
Testing
MOSFETS
.............................................
In-Circuit
Ohmmetering The
PDM
AMP
(A6
And
A7)
MOSFETS
••••••
In-Circuit
Ohmmetering The
PA
(Al
And
A4)
Transistors
•••••••
Ohmmeter
Testing
The
IPA•·
•
•·
·
•••••••••••••••·
• ••
•••·•··••••
Troubleshooting
the
RF
Oscillator•••···•••·••·•·•••····•••·•
Symptom:
No
Output
....••.•••.••.••••••••••.••.
•
•.••••••••
Open
Fuse/Loss
of
+30V
••••••••••••••••••••••••••••••••••
Ql,Q2
,CRl
.•.•.•
•
••..•.•.•••••..•..••••••••....••••.••••.
..................................................
Ul,CR4
U2
..
....................................................
U3
.......
...............................................
Troubleshooting
The
Frequency
Synthesizer•••••
•
·••••••••••••
Symptom:
No
Output
At
J2
Pin
6
•••••••••·••····•••••·•·•••
Symptom:
Improper
Output
Frequency/Loss
Of
Lock••••••••••
Troubleshooting
The
RF
Drive
System•••••·•········••••··•···
Symptom:
Underdrive
Overload
Will
Not
Allow
Transmitter
To
Come On •
•••••••
•
•••••
•
•••••••••••••••••••••
•
••••••
•
••••
Blown
IPA
Fuse
••••..•.••••••.
•
.•..•••••••..•.•••••.•••••
Check
PA
Drive
...............................
•
•.••......
Check IPA
Square
Waves .
.................................
Tuning
Circuit
Open·••··•·•••••••••···•··•·
•
•••••••••
•
··
IPA Output
Tuning···•••••••·••••••••·•·••••••·••••••••••
IPA
Half
Failure
•••.••••.••.•••••••.••••.••••••••.••••••
Check IPA
Drive
And
Supply
Voltage••••••••••••••••••••••
Check
Oscillator/Frequency
Synthesizer
Output•••••
•
···•·
Oscillator/Frequency
Synthesizer
To
IPA
Drive
5-179.
5-180.
5-181.
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5-184.
5-187.
5-189.
5-190.
5-196.
5-198.
5-199.
5-218.
5-
222.
5-223
.
Coax Open
••••
•
••••••••••••••••••••••••••••••••••••••••••
Troubleshooting
a
PA
Volts/PA
Amps
Ratio
Change
•••••••••••••••
5-225.
5-226.
5-227.
5-228.
5-229.
viii
Passi
ble
Causes
. .
.........
.
.....
...
............••......•..•.
Impedance
Change
..........................•...
•
•••••••••••
PA
Failure
• •
..••••
•
•.•••••••••••••••••••.••••••.••.•••••.•
Modulator
Failure
-Open Or
Short····•••···•·•·
·
·••····•••
Modulator
Failure
-
Short
•..•.•...•••..•...•....••...••.
M
odulator
Failure
-
Open•••••··•••••••••••·••••••••••·•·
Probing
The
Inside
Of The
Transmitter·•·•
•
·•••·••·••·•••••
• •
Low
Voltage
Testing
•.••....•••..••••.••.••.•.•....•••.••••••
Procedure
.
.........
.
...
.
........................••......•.
RF
Drive
Phasing
Measurement•·
·
··•·····•·•·········•···•
•
·••
Troubleshooting
AM
Noise•••••·•·••••·•••••
•
••
•
••••••••••••
• •
Troubleshooting
the
PDM
Generator•••••••••••••••••••••••••••
Symptom:
Hum
Null
Control
R30
Has
No
Effect
On
The
Noise
Level
........
.
......
...
.
..
. .
...
.
..
.
.......
.
........
.
No
DC
Sample
••••••••••••••••••••••••••••••••••••••••••••
012
De
f
ective
.
.........................................
.
R30 De
fective
.....
.
.......•.............•..........
.
....
Symptom:
No
Pulses
At
J4,
Causing
Zero
Power
Output
From
The
Transmitter••••
•
••
•
··•·•·•·•••·•••·•·••••·•··••·•
Symptom: Imba
lance
In
Output
Pulse
Widths
888-2126-026
WARNING
:
Disconnect
primary
power
prior
to
servicing.
Page
5-15
5-16
5-17
5-18
5-20
5-20
5-20
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5-20
5-21
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TABLE OF CONTENTS (Continued)
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5-238 .
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6-1.
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6-108.
6-110.
6-112.
6-116.
Symptom: Output(s) At J4 Always In A High State,
Causing One Or More PDM Amplifiers To Conduct Full Time •••
Tro ubleshooting High Temperature Readings •••••••••••••••••••••
High Ambient ................................................
Air Obstruction .. . ........•.........•.•..•.••.........•. ....
Module Heat Sinking
...................... .. ......... ........
PA Temperature Is High •••••••••••••••• ••• •••• •••••••••••• •• •
Output Power Too High .
..... .. .............................
PA Tuning .................................................
Abnormal RF Drive Level
RF Drive Phase Balance
...................................
....................................
SECTION VI.
PRINCIPLES OF OPERATION
Introduction
..................................................
Personnel Protection
..........................................
Principles Of Operation•·••·•····•••••••·•••••·•••••••••••••••
AC Power Flow .....•.••..•.••...••..•.....•• .•.. •. ...• •.•••.•
Power Flow .....•••. ...••.. •.. •••...•.••..•.•...•••..••.•.
RF
AC Controller
Switch Board ..........................................
.... .
................................................
System Controller Board .
........ ............................
Stat us and Multimeter ···•••••••· · ••••••••··••••• • ••·••·· ·
Purpose ................•..................................
Overview ..................•......................•........
....................................
.....................................
Description Of T he Bus
Bus
Arbitration Logic
Read Write Selection
'A' Bus Devices
......................................
...........................................
Synthesizer Control Latch U54
...........................
..................................
Status Input Latch U42
Overload Input Latch U46
PDM Power Latch U47
. ........ .......................
................ .. ...................
PDM And Status Latch U48
................................
Analog And Relay Control Latch U49
. .. ...................
Status LEDs Latch U53
...................................
A-Bus Address Decoder U52
...................... .. .......
MUX And Scaler Data Latches U29 And U30
Analog Multiplexer System ••••••••••••••• ••••• •• •••••••••
'B' Bus Devices ....•.••..•.•.•••........••.............•..
Analog-Digital Converter U40 • ••• ••
Ke y board And Display Controller U6
......................
......................
Analog Outputs ..••.......•...•................•.•••.....
PDM Genera tor •••••••• • •••••••••••••••• •• ••••••••••••••••••••
PDM Amplifier
...............................................
PDM Pull-Up Board
...........................................
..................................................
PDM Filter
Oscillator Al6 ..............................................
Optional Frequency Synthesizer (Al6)
........................
888-2 126-026
WARNING:
Disconnect primary power prior to servicing .
5-39
5-39
5-39
5-40
5-40
5-40
5-40
5-40
5-41
5-41
6-1
6-1
6-2
6-2
6-2
6-3
6-5
6-6
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6-7
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6-14
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6-17
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ix

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X
IPA Board e I t t t t t t t t t t t t t t t t I t t t I t I t I t t I t I I I t I t I t t I t t t t I I I t t I
IPA Toroid Board
PA Board
PA Toroid
....................................................
...................................................
Output Network ..............................................
Theory Of Design ..•••.••.........•........................
Directional Coupler
VSWR Board (Or Phase Angle Detector Board)
High
Voltage Power Supply ................. ..... . ... . ........
Introduction ...........•.......•.................•........
Description •.. .....................•••••••................
Low Voltage Power Supply ·· ·······•••••••••········•·••·••·•·
Introduction ••••••••.••.•••••••••••••.•...•••••.••••••••••
Description ........................ . ..................... .
SECT ION VI I.
PARTS LIST
Introduction ........ ..... ... ...... .....•..... .. •.....•...•••..
Replaceable Parts Service•••••••••• • •••••• • ·•• •••••••••• ••••••
SECTION VIII.
MAINTENANCE AIDS
Introduction
..................................................
APPENDIX A.
INSTALLATION
Introduction
..................................................
Unpacking
...... ......... ......................................
Returns And Ex c hanges
.......................................
General Installation Information• • ••••••••••••••••••••••••••••
Setup Procedures ..•............•.•..........••.•..............
General Requirements • •••••••••••••••••••••··••••••••••••••••
Equipment Placement· ·••••••••••••••• •••······••••••••·····• ·
Pre-Installation Inspection·····••····••••••••••••••••••••••••
Inspection
..................................................
Mechanical Installation•·• • ••··············•••••·········•••••
.......................................Equipment Positioning
Ground Strap Installation
Electrical Installation
............................... .. ..
.......................................
Power Requirements ••••..•••••.•••..•••••••.••••••.........
Electrical Installation Procedure· • •······•···•··• • ••••·•••·
Customer Interface Connections•••••••••••••••• •• •• •••• ••••••
Audio Input Installation Procedure•· ··· ·•· · ·••••·······••••·
Output Coax Cable Installation··· · ········•·••••••••••••••••
.................................
Pre -Turn On Electrical Checks
Initial Turn On Procedures
....................................
Initial Turn On
.............................................
Technical Assis tance
..........................................
888-2126-026
WARNING:
Di sconnect primary power prior to servicing.
Page
6-23
6-24
6-24
6-25
6-25
6-26
6-28
6-28
6-29
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6-29
6-32
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7-1
7-1
8-1
,,,-----_.
A-1
--
A-1
A-1
A-1
A-4
A-4
A- 6
A-6
A-6
A-7
A-7
A-7
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TABLE
OF
CONTENTS
(Continued)
Paragraph
Page
APPENDIX
B.
TEST
EQUIPMENT
B-1.
Introduction
..................................................
B-1
888-2126-026
xi
WARNING:
Disconnect primary power prior
to
servicing.

www.SteamPoweredRadio.Com
Table
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2- 10.
2-11.
2-12.
2-13.
2-14.
2-15.
2-16.
5-1.
5-2.
5-3.
6-1.
7-1.
7-2.
7-3.
7-4.
7-5.
7-7.
7-8.
7- 9.
7-10.
7-11.
7-12.
7-13.
7-14.
7-15.
7-16.
7-17.
7-18.
7-19.
7-20.
7-21.
7-22.
7-23.
7-24.
xii
LIST OF TABLES
Oscillator Board Al6, Controls and Indicators •••••••••••••••••••
System Controller Board Al3, Controls and Indicators••••••••••••
Status and Multimeter Board A12, Controls and Indicators ••••••••
System Controller Board A14, Controls and Indicators ••••••••••••
PDM Generator Board Al5, Controls and Indicators••••••••••••••••
Base of SX-1, Controls and Indicators•••••••••·••••••••••••••••·
PDM Amplifier Boards A6 and A7, Controls and Indicators •••••••••
PDM Filter Board AlO, Controls and Indicators•• ••••• ••••••••••• •
AC Controller Board A25 and Fuse Al9F2, Controls and
Indicators ....... .........................•.....................
IPA Board A5 and IPA Power Splitter Board A26Al, Controls
and Indicators ................................................. .
PA Board Al, Controls and Indicators•••• · ·•••••••••••• ••• •••·•••
AC Power Panel, Controls and Indicators••····••••·••· • •••••·····
PC Power Panel, Controls and Indicators •••••••••••••••••••••••••
Rear View of Transmitter Showing Interlock Switches •••••••••••••
Optional Frequency Synthesizer, Controls and Indicators •••••••••
Typical Readings . ... •.....•..•.. •.• ......•.•.••.••.••..•.....•.•
Troubleshooting the SX-1 AM Transmitter•••••• ••••• •••••••••••••·
Listing of Protection Devices in SX-1 ••••··••••···•••••··••••···
Fuses, SX-1 Xmtr •.•••..••.•..••••••..•.•••.•..••••.•••.••...•.•.
Analog Signals and Multiplexer Pins
.............................
Replaceable Parts List Index•••• •••••••••••• •••••••• ••• •••••••••
SX-1 lkW SS AM Xmtr ••...••.••••....••.•.••••••••••••.••••••.••.•
Spare Fuses, SX-1 Xmtr .••••••....•..••••..•••••••.••••••.•••••••
SX-1 PA Board .. . ..•. . ........• . ......•.•... .. .••••.•.•.••••••.••
Transformer, Toroid
. ........................................... .
Transformer, Toroid ....................•.................•...•..
Oscillator Bd •••.•••••.•. • . •• .•••.•• •••. ••••••••••••••••••••••••
.............................................
Frequency Syn Board
IPA Toroid Board,
16 to 2 ............•.........•...•...•.....•..
PA Toroid Bd ••.•...•.. .••...• ••. ....•..• ...... •..•....•..••..•..
Crystal Selection List•···••••·•··•••••··••••••·•·••••••••••••••
Phas e Angle Detector ....•... ....••.....••• ••..... ..•.•••••••••••
SX43 Software Pkg ....•.....•.......•••••....••.•..•••••••••••.••
SX43S Software Pkg ..•.•............••••..•••••••...•••••••••••••
Rec S/C and Fuse Kit .•... •...•.•• .••••• ...••••• •••..• • • ••...•...
SX-1 Parts, Format/Freq ........••.•••••••.••.••.••..••••••.....•
Coax Cable, PA/Pwr Split••••••••••••••••••••••••••••••••••··••••
SX-1 Basic lkW AM Xmtr •. . •••• ••. . •• • •••••••••••••.•••••••••••••.
PDM Amp Board ••••• ••••••••••• ••••• •• ••••• •••••••••••• • ••••••••••
PC Bd Assy, PDM Amp ••••••••••••••••• ••••••• ••••• •••• ••••• •••••••
Status/Multimeter Bd •··• • •·•··•••·••••••••••••••••••••••••••••••
System Controller Board••·••••••••••••••••·•••••••••••••••••••••
PDM Gen Boa r d •••••••••••••••••••••••••••••• •• •••••••••••••••• • ••
888-2126-026
WARNING: Disconnect primary
power prior to servicing.
Page
2-3
2-5
2-7
2-11
2-13
2-15
2-17
2-19
2-21
2-23
2-25
2-27
2-29
2-31
2-33
2-34
5- 1
5-49
5-51
6-16
7-2
7-6
7-7
7-10
7- 11
7- 12
7- 13
7-15
7-
18
7-19
7-20
7-
23
7-24
7-25
7-26
7-27
7-28
7-29
7- 37
7-39
7-40
7- 44
7-46
/ ~
. .,.,.-,---.___

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LIST OF TABLES (Continued)
Table Page
7-25.
7-26.
7-27.
7-28.
7-29.
7-30.
7-31.
7-32.
7-33.
7-34.
7-35.
7-36.
7-37.
7-38.
7-39.
A-1.
A-2.
A-3.
Switch Board ............................................,• ........
Dir. Board
Board
............................................ ,, .
.............................................
Coupler
Customer Int.
RFI Board .......................................................
..............................................
..........................................." .
1 kW PDM Filter Bd
Keyboard/Display Bd
H.V. Filter Bd
............................................... ...
.............................................
IPA Pwr Splitter Bd
PDM Pull-Up Board
...... .........................................
Cable 114, Power Supply .......................................... .
Cable Ill SX-1 Main ......• .. . . •...•••.•...•.•.•..............•. ,..
Cable
Cable
. ........ ... .. .. ....................... .
#6, Control Drawer
113, HV Filter
.............................................
............. ... ...............................
Cable #5, Jumpers
AC Controller Board
.............................................
7-50
7-51
7-52
7-54
7-58
7-59
7-60
7-61
7-62
7-63
7-64
7-66
7-67
7-68
7-69
Special Installation Tools and Equipment
.......................
A-5
Equipment Supplied with Transmitter and Listed on Packing Check
List Supplied with Transmitter•••••••••••••••• • ••••••••••••••••
Customer Interface Connection Points•••••••••••••••••••••••••••
888-2126-026
WARNING: Disconnect pr imary power prior to servicing.
A-5
A-9
xiii

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LIST OF ILLUSTRATIONS
Figure
2-1. Oscillator Board Al6, Controls and Indicators••••••••••• ••••• •••
2-2. System Controller Board Al3, Controls and Indicators ••••••••••••
2-3. Status and Multimeter Board Al2, Controls and Indicators ••••••••
2-4. System Controller Board Al4, Controls and Indicators ••••••••••••
2-5. PDM Generator Board Al5, Controls and Indicators••••••••••••••••
2-6. Base of SX-1, Controls and Indicators• • ••••••••·•·•••••• • ••••· •·
2-7. PDM Amplifier Boards A6 and A7, Controls and Indicators•••••••••
2-8. PDM Filter Board AlO, Controls and Indicators••••··•• ••·· ·•····•
2-9. AC Controller Board A25 and Fuse A19F2, Controls and
Indicators ..................................................... .
2-10. IPA Board AS and IPA Power Splitter Board A26Al, Controls
2-11.
2-12.
2-13.
2-14.
2-15.
4-1.
4-2.
4-3.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
and Indicators ................................................. .
PA Board Al, Controls and Indicators··•••··············•••····••
AC Power Panel, Controls and Indicators Top View With Power
Panel Removed From Transmitter·•••••••• •·•••••·••••·••••••···•••
PC Power Panel, Controls and Indicators Front View ••••••••••••••
Rear View of Transmitter Showing Interlock Switches • ••••••••••••
Optional Frequency Synthesizer, Controls and Indicators •••••••••
View Showing 11 Cover .... .•.................•....•...•••.•......
Directional Coupler Cover Screws· · ·•••· •• •·• • •••••••·•••••••••••
Top of SX-1 ••..•..••..•.. • •••.•.•••••.•••••••.••.•••••••••.•..••
Out line of MOSFET ••••••..••••.•••.••.••••••••••.••.••.••••••..••
PA Transistor Identification•••··•••• · ••·····••••••······•••••••
J4 on A16 Oscillator - 15 volts p-p ·••••••··•••··•·• • ••••••·····
Ql Collector on A25 AC Controller 30 volts p-p,
50 usec per division•••••• ••• ••••••••••••••••••••••••••·•••••···
Upper Trace - A16 Oscillator Board Output at ClO 10-25 volts p-p
Lower Trace - Q2 Collector, A16 Oscillator Board before Divide
By 4 ••••••••••••••• •• ••••••••••••••••••••••••••••• • •••••••••••••
Upper Trace -IPA Input, 10 volts per division
Lower Trace -IPA Transistor Output, 20 volts per division••••••
PA Transistor Outputs from One Quad 1450 kHz, No Modulation •••••
PA Transistor Outputs from One Quad 550 kHz, No Modulation ••••••
PA RF Drive Waveform, PA OFF, 30 volts p-p ••••••••••••• • ••••••••
PA RF Drive, PA ON at lkW, 30 volts p-p •••••••••• •••••••••••••••
60 kHz Square Waves at A15 PDM Generator U5-ll and U5-14,
15 volts p-p .........•............•.......•..............•......
5-12. Upper Trace -U5-9 on A15 PDM Generator
Lower Trace Q2 Collector on A15, Waveform is de offset above
ground by 2 to 4 volts (2 volts per division on both traces)
5-13. Upper Trace -U7-6 (R42), 3.5 volts p-p
Lower Trace -U8-6 (R59) U8 leads by 90 degrees ••••••••••••••••
5-14. Upper Trace - Ul0-12 (R62), 15 volts p-p
Lower Trace -U9-7 (R46) U9 leads by 90 degrees ••••• •••• •••••••
5-15. PDM Amp A6, A7 Outputs, 250 volts p-p
JS, J6 (Cases of MOSFETs) •••••••••••••••••••••••••••••••••••••••
xiv 888-2126-026
WARNING: Disconnect primary power prior to servicing.
Page
2-2
2-4
2-6
2-10
2-12
2-14
2-16
2-18
2-20
2-22
2-24
2-26
2-28
2-30
2-32
4-42
4-43
4-44
5-16
5-19
5-42
5-42
5-43
5-43
5-44
5-44
5 -45
5-45
5-46
5-46
5-47
5-47
5-48
· -------------

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,..,..-----.._
Figure
6-1.
6-2.
8-1.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-8.
8- 8.
8-8.
8-9.
8-9.
8-10.
8-11.
8-12.
8-13.
8-13 .
8-14 .
8-15.
8-16.
8-17.
8-18.
8-19.
8-20.
8-20.
8-20.
8-20.
8-20.
8- 20.
8-20.
8-20.
8-20.
8-20.
8-20.
8-21.
8-22.
8-23.
8-24
8-25.
A-1.
LIST OF ILLUSTRATIONS (Continued)
Output Network ••••.•.•••.....•..•..•.•••.•..•.•••.•..••••••.•••.
TEE Network •• ••• •••••••••••••••••••••••••••••••••• •• ••••••••••••
Wiring Diagram SX-1 (Sheet 1 of 2) ••••••••••••••••••••••••••••••
Wiring Diagram SX-1 (Sheet 2 of 2) ••••••••••••••••••••••••••• •••
Wiring Diagram Power Supply SX-1 ••••••••••••••••••• • ••••••••••••
Schematic AC Controller•••••••••••••••••••••••••••••• • ••••••••••
Schematic Keyboard/Display••••••••••• • ••••••••·•••••··•••••••·••
Schematic Switch Board .....••.•••...••.•••......••.•..•.••...•••
Schematic Oscillator Board·•······•····••••···· · •••·••••••••·•••
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
Schematic
System
Controller Board ...............................
Status/Multimeter
(Sheet
1 of 4)
......................
Status/Multimeter (Sheet
2 of 4)
...... ... ...... .......
Status/Multimeter (Sheet 3
of
4)
......................
Status/Multimeter
(Sheet
4 of 4)
......................
PDM Generator
Board
(Sheet 1
of
2)
. ...................
PDM Generator
Board
(Sheet 2 of 2)
. ..... ... ...........
Schematic PDM Amplifier•••••••••••••••••••••••••••••••••••·•••• ·
Schematic lkW PDM Filter .•.•.•••..••••.•......•.•••......•..•...
Schematic IPA Board ••••••••..••........•.••......•....•.......••
Schematic PA Module (Sheet 1 of 2) ••••····•••··••··••••·····••··
Schematic PA Module (Sheet 2 of 2) •••••••••••••••••·•••••••·••••
Schematic, Phase Angle Detector Board •• ••• • ••••••••••••••••• ••··
Schematic Directional Coupler Board•••••••• • •••••••••••••••••·••
Schematic RFI Board (P/N 992 5886 003) •••••••••••••• •• •••• • •••••
Schematic RFI Board (P/N 992 5886 002) ••••••••••••••••••••••••••
Schematic Customer Interface Board ••••• ••• •••• • •••••••••••••••• •
Outline, SX-1 ...••..............................................
SX-1 Running Sheets
-
Explanation
Sheet
(Sheet
1 of 11)
.........
SX-1 Running Sheets
(Sheet 2
of 11)
.............................
SX-1 Running
Sheets (Sheet
3 of 11)
.............................
SX-1 Running
Sheets
(Sheet 4 of 11)
.............................
SX-1 Running
Sheets
(Sheet
5 of
11)
.............................
SX-1 Running
Sheets (Sheet 6
of
11)
........................ .....
SX-1 Running
Sheets (Sheet
7
of 11)
.............................
SX-1 Running Sheets
(Sheet
8
of 11)
.............................
SX-1 Running
Sheets (Sheet
9 of 11)
....... .. .............. .. ....
SX-1 Running
Sheets
(Sheet 10
of
11)
............................
SX-1 Running
Sheets (Sheet
11 of 11)
........................ ....
Optional Frequency Synthesizer•••• •••• •••••••••••••• • •••••••••••
Block Diagram SX-1 -839 5695 333 ••••••••••••••••••.•••••••••••.
Simplified HV Power Supply Diagram -839 5695 336 •••·•••••••••••
Simplified LV Power Supply Diagram -839 5695 337 ··· •• •• • •••••••
Simplified Control Circuit Diagram -839 5695 338 •••••••••••••••
Correction Factors
................................. .. ...........
6-27
6-27
8-3
8-5
8-7
8-9
8-11
8-13
8-15
8-17
8-19
8-21
8-23
8-25
8-27
8- 29
8-31
8-33
8-35
8-37
8-39
8-41
8-43
8-45
8-47
8-49
8-51
8-53
8-55
8-57
8-59
8-61
8-63
8-65
8-67
8-69
8-71
8-73
8-75
8-77
8-79
8 -81
8-83
A-3
888-2126-028
xv/xvi
WARNING: Disconnect primary power prior to servicing.

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