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5–1

Troubleshooting

TROUBLE

TROUBLE

TROUBLE

Section 5—Troubleshooting

This section describes procedures for service personnel to diag-
nose and troubleshoot potential fault conditions in the power
amplifier and power supply.

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Содержание FM2000A

Страница 1: ...i FM2000A Amplifier Package User s Manual 2005 Crown Broadcast a division of International Radio and Electronics Inc 25166 Leer Drive Elkhart Indiana 46514 5425 U S A 574 262 8900...

Страница 2: ...ublication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language in any form by any means without the written permission of Crown International Inc Pri...

Страница 3: ...I O Connection 2 6 Section 3 Operation 3 1 Initial Power up Procedures 3 2 3 2 Power Switches 3 4 3 2 1 AC Input Circuit Breaker 3 4 3 2 2 DC Power Switch 3 5 3 2 3 Interlock Switch 3 5 3 3 Digital Mu...

Страница 4: ...Level Control 5 3 5 2 4 Power Out 5 3 5 2 Digital Multimeter Parameters 5 3 5 2 5 PA Temp 5 4 5 2 6 PA Voltage 5 4 5 2 7 Tot Current 5 4 5 2 8 PA1 8 5 4 5 3 Fault Indicators 5 5 5 3 1 Antenna 5 5 5 3...

Страница 5: ...tting Acquainted This section provides a general description of the FM2000A power amplifier system and introduces you to safety conventions used within this document Review this material before instal...

Страница 6: ...niquely designed to be lightweight and compact for convenient shipping and require only seven RU spaces for installation Installa tion is made simple with just three interconnections between the ampli...

Страница 7: ...de emphasis FM modula tion 75 kHz 400 Hz typically 60 dB Operating Environment Temperature Range 0 50 C at sea level Humidity Range 0 80 at 20 C noncondensing AC Power 240 volts AC 10 15 50 60 Hz Pow...

Страница 8: ...rs DANGER represents the most severe hazard alert Extreme bodily harm or death will occur if DANGER guidelines are not followed 1 3 2 Warnings WARNING represents hazards which could result in severe i...

Страница 9: ...2 1 Installation Section 2 Installation This section provides important guidelines for installing your power amplifier and power supply Review this information care fully for proper installation...

Страница 10: ...tection grounding strap and or mat 2 3 Unpacking Before handling any exposed printed circuit boards ground yourself with an antistatic strap and or mat The power amplifier power supply and two power a...

Страница 11: ...he center of the chassis also note the position of the connector on the modules and in the chassis 4 Insert the four power modules using their slide rails into the built in chan nels of the right side...

Страница 12: ...d inches 2 1 N m of torque 6 Tighten assembly screws to 10 pound inches 1 1 N m of torque 7 Tighten cord clamp screws to 10 pound inches 1 1 N m of torque Terminal Green Hex Head Screw Equipment groun...

Страница 13: ...exciter source such as a Crown Broadcast FM100 according to its instructions 4 Connect the RF input cable from the exciter source to the N connector on the back of the PA2000 5 Connect the RF output...

Страница 14: ...nector on the back of the PA2000 allows remote control and monitoring of Certain transmitter functions There are three basic control func tions AC on off RF power level adjustment and RF down off The...

Страница 15: ...aise Lower settings However some drive power less than one watt may still be present at the antenna Depending on the resistor used this pin can serve as a control for optional low power operation The...

Страница 16: ...perature a buffered metering output with 1 V 20 C 12 SWR a buffered metering output with a calculated reading of standing wave ratio in VDC 13 RF Output Power a buffered metering output with a calcula...

Страница 17: ...3 1 Operation Section 3 Operation This section provides general operating parameters of your power amplifier system and a detailed description of the front panel display...

Страница 18: ...uit breaker located on the rear panel of the power supply do not turn on the front panel power switch yet 3 1 Initial Power up Procedures 5 Turn on the exciter a Crown FM100 or equivalent and adjust i...

Страница 19: ...ust pot is unconventional CW lowers power 6 Before power up place the Local Remote switch located on the Metering Control board behind the front panel in the Local position and adjust the output power...

Страница 20: ...s adjust the PA2000 to the maximum power set by the Local Power Adjust This prevents adjusting to higher than permitted power levels 10 Verify that the following conditions are present as indicated by...

Страница 21: ...llustration 3 6 Interlock Switch Interlock Switch Power I O Power Switch W WARNING ARNING Lethal voltages are still present on the AC Input Board So handle with care 3 2 3 Interlock Switch This switch...

Страница 22: ...voltage ALC will read about 6 0 volts When the RF output is being regulated by the RF power control circuit this voltage will be reduced typically reading 5 0 to 6 0 volts The ALC voltage will be red...

Страница 23: ...ust be increased To achieve full output power 70 80 watts of input drive is required PA Temp PA heatsink temperature is greater than 75 C power foldback will begin at this point PA DC Power supply cur...

Страница 24: ...xt to it comes illuminates and built in redundancy allows the unit to continue operation The fuse can be replaced while the unit is operating Fuses 1 and 2 represent amplifiers 1 and 2 on the top left...

Страница 25: ...che non ha la dispozione do farlo M se diciamo che che non c e nulla nel mondo reale di ma scrivendo con la matita ci insegna a non parlare ma scrivendo con la matita ci insegna a non parlare in quest...

Страница 26: ...avity of the chassis The chassis of the power modules acts as a heat sink for the MOSFET amplifiers There are two power amplifiers mounted to spacer plates on each of the heat sinks for a total of eig...

Страница 27: ...nearest the Output Filter It consists of a micro strip transmission line that combines the output power from the four power amplifier modules so that ultimately all the power comes together at one com...

Страница 28: ...a It provides SWR readings from the Output Filter and folds back the amplifier power if the SWR exceeds safe operating limits Protec tion circuitry for overcurrent and overtemperature conditions is de...

Страница 29: ...s which prevent harmonics and spurious products from feeding back into the AC power lines The current flows from the inductors to a bridge rectifier that converts the current to DC Power and from ther...

Страница 30: ...the power modules The DC Output Board also provides the 24 volts that operate the cooling fans in both the PS2000 and the PA2000 There are two parallel paths from the DC Output Board with half the pow...

Страница 31: ...shooting TROUBLE TROUBLE TROUBLE Section 5 Troubleshooting This section describes procedures for service personnel to diag nose and troubleshoot potential fault conditions in the power amplifier and p...

Страница 32: ...ur exciter turned on Secure all connections to the PS2000 Ensure AC input circuit breaker is flipped up Ensure main power switch is turned on Is exciter delivering sufficient RF drive Check In Ref met...

Страница 33: ...Standing Wave Ratio If the SWR is over 1 5 1 then look for q effects of inclement weather such as icing on the antenna and feed line q for moisture in the feedline q insecure antenna connections 5 2...

Страница 34: ...igh SWR for overcurrent check PA DC fault indicator and if flashing check current for proper levels total and individual Power Amps for overtemperature ambient temperature higher than 50 C reduce temp...

Страница 35: ...match check for icing moisture on the feedline and secure antenna connections Overcurrent check PA DC fault indicator if flashing monitor current for proper levels total and individual Power Amps Faul...

Страница 36: ...have short circuits there is damage on the winding of the transformer It will have to be replaced see Section 7 5 3 4 PA DC Discrepancy in current between the individual amplifiers or in total current...

Страница 37: ...wings Section 6 Reference Drawings The illustrations in this section may be useful for making adjustments taking measurements troubleshooting or understanding the circuitry of your RF power amplifier...

Страница 38: ...6 PA7 PA8 Power Out PA Temp PA Voltage Tot Current ALC SWR In Ref Metering PA1 PA2 PA3 PA4 PA5 PA6 PA7 PA8 Fuses Power I O RF Input Remote I O Control RF Monitor Optional Connection RF Output Circuit...

Страница 39: ...Diagrams and Schematics 50 70 watt exciter Crown FM100 PA2000 Power Amplifier RF output Control PS2000 Power Supply RF Input 240 volts AC 50 60 Hz Input Power Single Phase DC output DC input Control 2...

Страница 40: ...PS2000 Block Diagram 240 VAC AC CIRCUIT BREAKER AC INPUT NEUTRAL GROUND AC INPUT CCA POWER SWITCH RECTIFIER PFC CONTROL CCA DC OUTPUT CCA 0 to 50 VDC RETURN PS CONTROL 9 PIN DSUB 220 VDC 12 VDC VOLTA...

Страница 41: ...6 8 FM2000A User s Manual Illustration 6 5 PA2000 Block Diagram...

Страница 42: ...forse uno si dice se diciamo che ma scrivendo con ma scrivendo con in questo mondo forse uno si dice se diciamo che ma scrivendo con ma scrivendo con in questo mondo forse uno si dice se diciamo che m...

Страница 43: ...6 14 Reference Drawings Ribbon Cables and Connectors Ribbon Cables and Connectors...

Страница 44: ...6 16 Reference Drawings Notes...

Страница 45: ...ort Section 7 Service and Support We understand that you may need various levels of support or that the product could require servicing at some point in time This section provides information for both...

Страница 46: ...sheet page 7 5 and include it with your returned product 7 2 24 Hour Support In most instances what you need to know about your product can be found in this manual There are times when you may need mo...

Страница 47: ...al intended use Warranty repair can only be performed at our plant facility in Elkhart Indiana USA or at a factory authorized service depot Expenses in remedying the defect will be borne by Crown Broa...

Страница 48: ...7 4 FM2000A User s Manual Notes...

Страница 49: ...pping charges which we will reimburse We do not cover any charges for shipping outside the U S or any of the expenses involved in clearing customs If you have any questions about your Crown Broadcast...

Страница 50: ...G 1 Glossary Glossary The following pages define terms and abbreviations used throughout this and other Crown Broadcast manuals A B C...

Страница 51: ...e emphasis also called Wideband carrier A continuous signal which is modulated with a second information carrying signal crosstalk In FM broadcasting this term generally refers to the interaction betw...

Страница 52: ...t a Morse code rate Used in the on air identification of frequencies gain reduction The process of reducing the gain of a given ampli fier harmonics Undesirable energy at integral multiples of a desir...

Страница 53: ...pectrum between audio fre quency and the infrared portion 2 A frequency useful for radio transmission roughly 10 kHz and 100 000 MHz SCA Subsidiary Communications Authorization see subcarrier S N Sign...

Страница 54: ...mitter designed to internally change an FM signal from one frequency to another for retransmission Used in conjunction with terres trial fed networks satellator A transmitter equipped with an FSK ID o...

Страница 55: ...F F Fans 4 4 4 6 5 5 Fault Indicators 3 7 5 5 Frequency Range 1 3 Fuse Indicators 3 8 H H H H H Humidity Range 1 3 I I I I I In Ref 3 4 5 3 Input Divider Board 4 3 Installation 2 5 Interlock Switch 3...

Страница 56: ...2 RU spaces 1 2 S S S S S S N Ratio 1 3 Safety 1 4 Schematics 6 3 service warranty 7 3 Service Instructions 7 5 Spurious Products 1 3 SWR 1 3 3 4 5 3 T T T T T Tot Current 5 4 transmitter package 1 2...

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