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10

VII. TECHNICAL ASSISTANCE & SERVICE

Servicing your QSC product requires a trained and qualified technician. There are no user serviceable components inside, and the danger of
electric shock exists. Additionally, some of the components are QSC-specific parts that require QSC replacements. Comprehensive service
manuals for most models are available from QSC.

Technical Assistance

If you suspect that your UF-3 is defective, check your system configuration and UF-3 settings to determine the origin of the problem. Incorrect
audio interfacing, poor cabling, or other system-level impairments are the leading causes of problems in audio systems. For technical assistance
beyond the information given in this manual, contact QSC Technical Services.

Factory Service

If your UF-3 needs factory service, contact QSC Technical Services for instructions and a Return Authorization (RA) number. QSC cannot be held
responsible for products that are returned without a Return Authorization.

Product Return Guidelines

1.

Pack the product well for protection during shipment. QSC will provide factory packaging upon request, free of charge.

2.

Include a copy of the sales receipt, your name, return address, phone number, and defect description with your return correspondence.

3.

Call or e-mail QSC Technical Services for a Return Authorization number. Have the product’s model number and serial number, as well
as your shipping and telephone information ready at hand.

4.

Mark the Return Authorization number on the outside of the packaging.

5.

Ship the product prepaid to QSC Audio Products. We recommend United Parcel Service (UPS).

QSC Technical Services

1665 MacArthur Blvd.
Costa Mesa, CA 92626 USA

Telephone:

+1 (800) 772-2834
+1 (714) 957-7150
+1 (714) 754-6175

Fax:

+1 (714) 754-6173

BBS:

+1 (714) 668-7567

E-mail:

[email protected]

Web:

http://www.qscaudio.com

Qualified Service Centers

QSC maintains a service center network for your convenience. If you wish to return your product to a local service center, call QSC Technical
Services for a referral. However, accessories, input modules, and other peripheral QSC products must be returned to the factory for service.

International Servicing

For QSC products outside the United States, contact the distributor or dealer from where the product was purchased. There are numerous service
centers in many countries. You can get a referral to a service center in your country from your dealeror distributor, or by contacting QSC Technical
Services.

Summary of Contents for UF-3

Page 1: ...11 UF 3 UF 3 UF 3 UF 3 UF 3 Universal Universal Universal Universal Universal Filter Filter Filter Filter Filter TD 004031 00 TD 004031 00 Rev A Owner s Manual ...

Page 2: ......

Page 3: ...derUF 2accessorydoes butonasmaller morecompactcircuitboardthatcanfitinmoreamplifier models such as the PowerLight 3 4 3 8X or 4 0 To fit in these models the circuit board has a pre scored breakaway section Newer models such as the PowerLight PLX DCA and CX series require the installation of an appropriate BusCard in order to provide a slot for theUF 3 Dependingontheamplifiermodel aBusCardcanprovid...

Page 4: ...ers see Figure 3 Note If you neglect to place jumpers on either header no signal will pass on that channel RN102 of low pass filter f RN104 of high pass filter f RN204 of low pass filter f RN202 of high pass filter f low pass bypass enable J101 J102 high pass bypass enable J103 CD horn EQ low pass bypass enable J202 J201 high pass bypass enable CD horn EQ J203 1 2 3 1 2 3 1 2 3 1 2 3 Channel 1 Cha...

Page 5: ...0 dB of boost at 20 kHz place the jumper across pins 2 and 3 If you do not place a jumper in one position or the other the CD horn equalization circuit will be inactive The table below is a summary of jumper settings for the UF 3 similar information is printed on the breakaway section of the UF 3 s circuit board Figure 4 shows how to identify the SIP resistor values y c n e u q e r F z H r o t s i...

Page 6: ...the jumper on Jx01 to bypass the low pass filter across pins 1 and 2 2 Set the jumper on Jx02 to enable the high pass filter across pins 2 and 3 3 No jumper on Jx03 4 Insert a resistor network in RNx04 that is appropriate to the desired roll off frequency typically 20 30 40 or 50 Hz Typ 20 50 Hz Subsonic roll off Use only these three digits to determine resistance code Disregard the other numerals...

Page 7: ...correspondstotheupperlimitofthedesiredfrequencypassband Thisfrequencymustbehigher than the one selected for the previous step CD Horn Equalization Filter A constant directivity horn requires a 6 dB per octave high frequency boost from about 3 5 kHz to provide a flat frequency response On the UF 3 you must use the CD horn equalization in conjunction with the high pass filter Program settings 1 Set ...

Page 8: ...2 and 3 and insert a resistor network into RN104 that corresponds to the roll off frequency you desire If you do not want subsonic filtering set J102 to bypass the high pass filter across pins 1 and 2 Steps 6 through 9 configure Channel 2 6 Set J202 to enable Channel 2 s high pass filter 7 Insert a resistor network into RN204 that is appropriate to the crossover frequency you set in 4 8 If you nee...

Page 9: ...are driven by an amplifier operating in the parallel mode Both channels of its UF 3 are set with the high pass filter at 150 Hz the crossover point from the subwoofers and the low pass filter at 1 kHz Midrange and High Frequencies The remaining speakers are driven by the same amplifier the mids by channel 1 and the highs by channel 2 The settings for channel 1 of the UF 3 are high pass at 1 kHz th...

Page 10: ... the UF 3 fully into the holes on the BusCard Solder all 22 pins to the BusCard make sure you don t create any solder bridges Then install the BusCard in the amplifier see the BusCard instructions for details Installing the UF 3 on an input card Turn off the amplifier and unplug it from the AC Allow about 10 minutes or longer for the internal voltages to bleed down before you open the amplifier ch...

Page 11: ...ing the two mounting screws Make sure the screws are tightened snugly but do not over torque them Re install the upper blank panel Installation of the UF 3 is now complete and the amplifier is ready to be reinstalled into the system VI WARRANTY AND DISCLAIMERS Disclaimer QSC Audio Products Inc is not liable for any damage to speakers amplifiers or any other equipment that is caused by negligence o...

Page 12: ...request free of charge 2 Includeacopyofthesalesreceipt yourname returnaddress phonenumber anddefectdescriptionwithyourreturncorrespondence 3 Callore mailQSCTechnicalServicesforaReturnAuthorizationnumber Havetheproduct smodelnumberandserialnumber aswell as your shipping and telephone information ready at hand 4 Mark the Return Authorization number on the outside of the packaging 5 Ship the product ...

Page 13: ......

Page 14: ...12 QSC Audio Products Inc 1675 MacArthur Blvd Costa Mesa California 92626 USA Tel 1 714 754 6175 Fax 1 714 754 6174 Web www qscaudio com ...

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