Larcan MX20U, MX20UX Users Manual
TECHNICAL MANUAL
20 WATT UHF AMPLIFIER
FOR MX20U SERIES
PUBLICATION TSM 20-311
TV TRANSMITTER/TRANSLATOR
LARCAN INC.
228 AMBASSADOR DRIVE
MISSISSAUGA, ONTARIO
CANADA L5T 2J2
PHONE: (905) 564-9222
FAX: (905) 564-9244
Rev 0: December 1, 1999
MX Series - 20 Watt UHF AMPLIFIER
Section Title Page
NOTICES, ETC. ..................................................................................................................3
SAFETY AND HEALTH WARNINGS ............................................................................. 4&5
GENERAL SERVICE INFORMATION
1) Parts Lists Explained..........................................................................................5
2) Interpreting LARCAN Drawing Numbers............................................................5
3) The LARCAN Assembly Prefix Numbering System ........................................... 6
4) List of Prefix Numbers for the 20W Amplifier .....................................................7
5) Production Changes...........................................................................................7
INTRODUCTION .................................................................................................................8
GENERAL DESCRIPTION..................................................................................................8
SPECIFICATIONS.............................................................................................................10
ABOUT THIS MANUAL .....................................................................................................11
PUBLICATIONS LIST for MX series 20W UHF Amplifier:
PUB99-36 20W UHF Amplifier Installation:
1. General Information..............................................................................36-1
2. Grounding and Ground Loops..............................................................36-2
3. Lightning and other Transient Protection .............................................36-4
4. Power Wiring ........................................................................................36-9
5. Ventilation and Air Conditioning .........................................................36-10
6. Fire Protection ....................................................................................36-11
7. Unpacking ..........................................................................................36-12
8. Transmitter External Interlock Connections .......................................36-12
9. On Site: First Time Start-up................................................................36-13
PUB99-37 20W UHF Amplifier (Prefix 1):
1. Amplifier Chassis Description...............................................................37-1
TSM 20-311 rev 0: December 1, 1999 1 20 W UHF Amplifier
MX Series - 20 Watt UHF AMPLIFIER
Cadco M-369 Manual
Cadco P-379 Manual
Section Title Page
PUB99-38 Heatsink Assembly (Prefix 2):
1. Heatsink Assembly Description............................................................38-1
2. Front End Module.................................................................................38-2
3. IPA1 Module.........................................................................................38-2
4. PA Module............................................................................................38-4
5. Directional Coupler...............................................................................38-5
6. RF Metering Board Description (Prefix 5) ............................................38-6
7. RF Metering Board Test and Calibration..............................................38-6
PUB99-39 20W Control Panel & Metering:
1. Control Panel Description.....................................................................39-1
2. Control Board Assembly Description....................................................39-2
PUB99-91 Basic Transmitter Maintenance:
1. General.................................................................................................91-1
2. Daily .....................................................................................................91-1
3. Weekly..................................................................................................91-2
4. Monthly.................................................................................................91-2
5. Semi-annually and Annually.................................................................91-2
6. Transmitter Cooling System .................................................................91-2
7. Static 1, Equipment 0: A brief Static Tutorial........................................91-3
8. FET and Surface Mount Replacement .................................................91-4
9. Replacement Parts...............................................................................91-7
10. Spare Parts Recommendations ...........................................................91-9
TSM 20-311 rev 0: December 1, 1999 2 20 W UHF Amplifier
MX Series - 20 Watt UHF AMPLIFIER
NOTICES, ETC.:
THIS EQUIPMENT USES STATIC-SENSITIVE CMOS INTEGRATED CIRCUITS. Observe proper
handling precautions (indicated in Maintenance Sections) at all times when working with this equipment.
TOXIC MATERIALS NOTICE... IMPORTANT...
Effective thermal management in certain semiconductor devices in this equipment is possible only through
the use of Beryllium Oxide ceramic materials. This equipment contains devices made with Beryllium
Oxide!
Beryllium and its compounds is a POISON if taken into the body in any manner.
To reduce your risk, remember: In case of accidental breakage of any kind of semiconductor
device, DO NOT INHALE THE DUST, and AVOID GETTING DUST IN YOUR MOUTH; it could contain
Beryllium. DO NOT LET BERYLLIUM DUST INTO YOUR BLOODSTREAM THROUGH CUTS OR
OPEN WOUNDS!
Seek and obtain IMMEDIATE medical attention if the dust enters your body in any manner.
Avoid cuts by wearing gloves while picking up the pieces. Wash your hands thoroughly after
replacing devices. Dispose of defective devices only through approved toxic waste disposal
facilities.
Remember too, after cleaning up an accidental breakage, avoid inhaling the dust while replacing or
emptying vacuum cleaner filter bags, and wash your hands well after servicing the vacuum
cleaner.
All material in this manual is copyright © LARCAN INC. and reproduction in whole or in part in any form for
any purpose other than exclusive use of the equipment owner, without prior written authorization from
LARCAN INC. is prohibited.
Trademarks are the property of their respective owners and are mentioned in the text for discussion
purposes; any such mention is not necessarily an endorsement of the trademark or its owner. Parts lists
may also contain trademarked vendor names as an aid in procurement of spare parts. We apologize for
any inadvertent omission of trademark acknowledgement; any such omission was completely accidental.
Although the following pages contain as much information about the 20W UHF Amplifier as it is
reasonably possible to provide, nevertheless we must state that these instructions do not purport to cover
all details or variations in equipment nor to provide for every possible contingency to be met in connection
with its installation, operation, or maintenance. It is assumed that fully competent technical personnel will
be responsible for the maintenance and repair of the equipment that is described in this manual. Should
further information be desired, or should particular problems arise which are not covered sufficiently herein
for the purchaser's purposes, or should replacement parts be required, the matter should be referred to us.
LARCAN INC.
228 Ambassador Drive,
Mississauga, Ontario, Canada L5T-2J2.
Telephone (905) 564-9222, FAX (905) 564-9244
TSM 20-311 rev 0: December 1, 1999 3 20 W UHF Amplifier
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