Ultra-VU Meter
Contents
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4. 3 1 5 Where to Find Hein 3 SECTION 2 PREPARATION FOR USE 2 1 Initial Inspection esae xe Rue RR EIS eee Rae EE des 4 2 2 Claims u ur E EE Eed ad ein ee a ee ed ela ea 4 2 3 Repacking for Shipment 4 2 4 Installation oreet ee hace ey Oe iin cm 4 2 5 Connecting Mains Power 4 2 6 Input Selection on Dual Input Models 4 2 7 Connecting Digital Input Models 4 2 8 Connecting Analog Input Models 5 2 9 Rear Panel Programming Switches 5 SECTION 3 OPERATING INSTRUCTIONS 3 1 VU Diol Descrip peni ro a 6 3 2 Herve PC EET 6 3 3 PPM Dis n mm 6 3 4 Peak Hold Display IAA ee 6 3 5 LOUD Lou jes LEE ER 6 25 S Image Sum Display scada dada ada 6 3 7 FINE High ResolutionMode 7 3 8 Auxiliary Data Display 7 39 Changing Display BrigninGss uoce a o us aa ac maa e an ain 7 3 10 CLIP indicator set point 7 3 11 Resetting the Program 7 SECTION 4 MAINTENANCE 4 1 ee TOMAN IAA Pao oe Sk ee ee ded 8 4 2 EE 8 4 3 Handling of CMOS Integrated Circuits 8 4 4 Access to Circuit Cards 8 4 5 Power Supply LG 28p72 tenes 8 4 6 a Input Control Card LG2
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6. Ultra VU Operation amp Service Manual Lo gitek TWO YEAR LIMITED WARRANTY Logitek Electronic Systems Inc warrants its pro fessional equipment excluding Logitek Software which is covered by a separate warranty against de fects in materials and workmanship for two years pur suant to the following terms and conditions The warranty extends to the original purchaser only LOGITEK will repair or replace at its option at its factory without charge professional equipment if a defect in materials or workmanship develops during the first two years following purchase when the equipment is returned to the factory or LOGITEK au thorized service centers freight prepaid with a de scription of the nature of the failure No reimbursements can be made for repair charges that are not factory authorized After repair or replace ment LOGITEK will return the equipment to the pur chaser freight prepaid In the event that any part of this professional equipment becomes defective during the first two years following purchase and purchaser wishes to attempt repair purchaser may obtain a replacement part by notifying LOGITEK of the part of the equip ment which has failed LOGITEK will thereafter ship a replacement part freight prepaid LOGITEK may re quire the purchaser to return the defective part to LOGITEK freight prepaid as a condition of such re placement either before or after LOGITEK ships the replacement part LOGITEK
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8. LES EE eu cj E O ZX e O O a 7 N C E de NA O ES O CA O e NO we o O O o S 28 ge SOI O M x TAI Gi O O O O O O O O O OO O ES Qe ES a 7 vol GA zo Ww CO Sie O d O T O O O O OOO O O OO O O S GM E S D O O RE SS SE O O V gt o IR o LOI O 22 0 SR gt No TO ics d x AJ Q 6Y HA C zr OJO INdNI INdNI 33 Page 24 Ultra VU Operation amp Service Manual lt S tr Ultra VU Operation amp Service Manual Erir
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10. Peak Markers 8 9 10 12 14 16 18 dB above ref pt Ballistics VU Mode 300 mS 200B attack A release PPM Mode 0 mS attack 2 85 24dB release Peak Hold 0 mS attack 2 or 5 Second hold Max Hold 0 mS attack pushbutton release Image Phase 4 Sec hold on max image Clip Indicator trigger on 1 or 4 consecutive clipped samples Frequency Response Normal 1 dB 20 Hz 20 KHz Loudness Filter 58 dBSPL auditory curve 40 dB 20 Hz 0 dB 1250 Hz 50 dB 20 KHz Brightness control 8 levels Analog Input Sensitivity 10 to 20 dBu for full scale rear panel adjustable Overload Level 24 dBu Impedance 40 Kohm balanced Connector 3 pin XLR Digital Input Formats AES EBU or S PDIF Impedance 110 Ohm XLR 75 Ohm coax adapter 2200 Ohm XLR transformer balanced Pass through Termination AC Line Input Voltage 50 60 Hz 105 129 VAC or switch settable 220 240 VAC Power Requirement UV1 all UDT all 10 Watts UV2 all 20 Watts Ultra VU Operation amp Service Manual Dimensions 1RU enclosure Desk top enclosure 19 W x 7 D x 1 H 84 W x 9 D x 2 H 1 ndari The Ultra VU meters are designed to conform to the ballistic standards described in IEEE document G 2 1 2 13 IEC document 268 and EBU document 3205 E This ensures that the bargraph motion will closely track other standard mechanical and elec tronic meters The one exception to these standards is the PPM attack time The Ultra VU uses a true peak
11. 50V ceramic CE UK50 104 C30 10uf 25V tantalum AV TAP106K025HSB Diodes D1 5 4V zener GI 1N4734A Ferrites FR1 7 600 ohm 100Mhz MU BLM31A601SPB Integrated Circuits IC1 2 Dual bi fet op amp TI TLO72CP IC3 4 Balanced receiver 6dB AD SSM2143P IC5 5 VDC regulator 100mA MO MC79L05ACP IC6 5VDC regulator 100 mA MO MC78L05ACP IC7 16 bit ADC AD AD1877JR IC8 Watchdog timer uP reset MM MAX1232CPA IC9 3 to 8 decoder MO SN74HC138AD IC10 PROM 128K 120ns MC 27C128 12 L IC11 16 bit DSP AD ADSP 2105KP40 IC12 5VDC regulator 1 5A MO MC7805CT 5 pcs 8 pin dip socket EM 100 083 10 1003 1 pc 32 pin PLCC socket EM 150 032 11 02 1 pc 68 pin PLCC socket EM 150 068 11 02 Connectors J1 2 Female XLR NT NC3FK H J3 3 pin socket PN CE100F28 3A J4 3 pin large socket PN CE156F20 3A J6 7 10 pin dual row socket PN 050 010 455 P3 3 pin header PN MFSS100 3A P4 3 pin large header PN MFSS156 3A P5 6 10 pin dual row header PN 051 010 153 Resistors R1 2 50K trimpot multiturn MP CT9X503 R3 5 4220 1 R6 7 100K R8 9 100K 2 5 position bussed CT 770 61 R104 R10 11 21K 1 DL RNC55H2102BS R12 14 4220 1 R15 16 300 R17 18 21K 1 DL RNC55H2102BS R19 20 20K 8 position isolated SMD DL SOMC1603203G R21 22 10K Switches S 1 8 Dip switch block CT 194 8MST Crystals Y1 12 288 Mhz CT MP122 1 pc Circuit Card LG 266 Analog Control 5 3 Digital Dual Input Control Card C1 C2 4 C5 10 C11 C12 Page 13 Capacitors 047uf 1000V ceramic 10uf 25V tantalum 1 uf 50
12. VU can be forced to dis play only one input by connecting a remote switch to the unit Consult the factory for details 2 Connecting Digital Input Models The Ultra VU accepts AES EBU or S PDIF serial data at sample rates of 30 000 to 50 000 samples per second via a female XLR connector on the rear panel The input is also wired directly to the male XLR con nector on the back panel for use in loop through mode The loop through connector provides a con venient way to daisy chain several pieces of equip ment off of one digital output Loop through works well with AES EBU signals but should be limited to 10 feet with S PDIF signals and cables S PDIF signals using RCA type plugs may be con nected to the input using an RCA to XLR adapter Coax cables using BNC connectors can be con nected to the input using a BNC to XLR adapter Both adapters are available from Logitek AES EBU Connection Pin 1 Shield Pin 2 Signal Pin 3 Signal It is also important to set the two input load switches located between the two XLR connectors Input Load Switch Settings Sw1 Sw2 Ohms Use Up Up 2200 Loop through mode Up Dn 110 balanced twisted pair XLR Dn Up 75 unbalanced coax RCA amp BNC Dn Dn 44 do NOT use this combination Ultra VU Operation Service Manual 2 8 Connecting Analog Input Models The Ultra VU accepts balanced or unbalanced in puts via rear panel
13. XLR connectors on analog input only models or 3 circuit 1 4 phone plugs on dual in put models The connectors are wired as follows Balanced Connection Pin 1 or Sleeve Shield Pin 2 or Tip Signal Pin 3 or Ring Signal Unbalanced Connection Pin 1 or Sleeve Shield Pin 2 or Tip Center Hot Pin 3 or Ring Connect to pin 1 The Ultra VU shield pins are bonded directly to the chassis atthe connector and do not share any ground paths with the internal circuitry This allows cable shields to be connected at both ends without causing hum problems The zero reference level for each input can be set anywhere between 10 dBu and 20 dBu by adjusting the multiturn gain control located adjacent to each in put connector A small flat blade screwdriver is needed to adjust the gain 2 9 Rear Panel Programming Switch A block of eight mode setting switches is located on the rear panel of the meter to the right of the input XLR connectors The switches are numbered 1 through 8 and are set by pushing the white levers up or down with a small screwdriver or pen point The bargraph zero reference marker and the refer ence level of the zoom display is set via switches 6 7 and 8 as shown Zero Reference Setting Sw6 Sw7 Sw8 dBs below full scale Up Up Up 10dB Up Up Dn 12dB Up Dn Up 1l4dB Up Dn Dn 1l6dB Dn Up Up 18dB Dn Up Dn 20dB Dn Dn Up 20dB Dn Dn IDn 20dB
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15. llo Po y yv la yv o yv lo Is RJ Spx ARIAS NI SPN AR A RJ UPN AR 581 RJ MIR AIR lt 3 lt N lt N S A lt N x lt lt N lt x N x lt I ze Le oec 6z ER Lc ER sz vc ec ze WA oz 6L ER Zt 1 921 6d I i vOo c6d ois zai 8 191 gat e 191 sai oi 191 s Ys SSL SSL 9s 9s DER DER eg L EI e bas ura CSL CSL CSL L A zbas ZSL CSL ZSL Si Bas LSI LSI LSL Zl LI o6es OSL OSL os 8 ZL ze ez 031 6109 Peon zar S L HO 1331 01 ez sz aa1 g6 g 19 ez iz agg Hob q PIS N N N N N N N N N N y y y y y y a No Vo xa s s o NY js IS TN lo y s ss ES E aN ONY ja yv o TN lo y Sd e sig var Z vz SI SII SR 3 an 2 Kf als als 318 S s alls a s ai Ns MIRI alls al sj a Zo no S N N S R Sj e N e s x x 9i 031 zg g 0 mea S N Z1 6 0315 1 RAS ER si vi i SE LL OL 6 8 A 9 S y z L s s dala ated sat 2 151 zai 9 191 bob Li 121 o0aroz o a 6 m md 4 vs ER vsi 912S Geck EE SSL SSL ss v1 Sees yes BA Ed 9s 9s ost zz 8P s em DE EES EE beS r RI SMO6LZZXVNN LH LOI 8 1 Page 25 Ultra VU Operation amp Service Manual Page 26 96 wrnr ggc
16. measure ment scheme that always displays the highest peak of the input signal The PPM standard specifies a short averaging period for peak signals that keeps sounds with durations too short to be heard well from being displayed no matter how loud they are The de lay also allows mechanical meters to keep up with fast changing inputs Under most circumstances there is no noticeable difference between true peak and PPM peak readings However if you do need the Ultra VU to conform to the PPM peak standard then please contact the Logitek factory for further informa tion 1 4 Instrument Identification The Ultra VU is identified by a model number and athree or four digit serial number The model number and serial number appear on a label on the back of the unit near the power cord All correspondence to your Logitek dealer or to the Logitek factory should refer to the model number and serial number 1 5 Where to Find Help Logitek customer service personnel are available to help with any questions comments or problems you might have with the Ultra VU meter both during and afterthe warranty period Our hours of operation are 8AM to 5PM central time We may be contacted in one of the following ways By Phone 877 231 5870 USA amp Canada or 713 664 4470 By Fax 713 664 4479 By Email help logitekaudio com By Mail Logitek Electronic Systems Inc 5622 Edgemoor Drive Houston Texas 77081 USA Page 4 SECTION 2 PRE
17. op amp Balanced line receiver 5VDC regulator 100 mA 5VDC regulator 100 mA ADC 16 bit stereo 8 pin dip socket Connectors Phone jack switch PC 10 pin dual row socket Ferrites Ferrite bead Resistors 21k 1 4220 1 50K multiturn trimpot 21K 1 4220 1 300 ADC Input circuit card MM MAX7219CWG MO MC7805CT PN 051 010 153 PN MFSS100 3A PN 050 010 455 PN CE100F28 3A NK AB11AP FA LG 267 CE DD 750 AV TAP475K025CCS NC NMC1206NPO222K50TR AV TAP105K035HSB AV TAP475K025CCS NC NMC1206Z5U104M50T AV 12061A471JATMA NC NMC1206Z5U104M50T AV 12065E103MATMA AV TAP105K035HSB AV 12065E103MATMA NC NMC1206Z5U104M50T AV 12061A471JATMA NC NMC1206Z5U104M50T GI 1N4734A SG NE5532N AD SSM2143P MO MC79L05ACP MO MC78L05ACP AD AD1877JR EM 100 083 10 1003 SW RN 114BCP PN 050 010 455 MU BLM32A07PB DL RNC55H2102BS MP CT9X503 DL RNC55H2102BS LG 264A Ultra VU Operation amp Service Manual SECTION 6 MANUFACTURERS LIST CODE MANUFACTURER LOCATION AD Analog Devices Norwood MA AV AVX Stantel Corp Myrtle Beach SC BE Belden Richmond IN CE Centralab Electronics Div Milwaukee WI CK C amp K Components Newton MA CS Crystal Semiconductor Austin TK CT CTS Elkhart IN DL Dale Tempe AZ EM Ecam Technology Scottsdale AZ Gl General Instruments Sunnyvale CA IL Illinois Capacitor Lincolnwood IL LF Littlefuse Des Plaines IL LG Logitek Circuit Cards Houston TX MC Microchip Technol
18. shall not be responsible for any other charges or liabilities associated with purchaser made repairs No part or equipment shall be considered defec tive if it fails to operate due to exposure to extreme temperatures or excessive moisture in the atmo sphere Light bulbs batteries potentiometers or other equipment not manufactured by Seller shall carry only the warranty if any of the original equipment manufacturer in effect at the time of shipment of this order and Seller s obligation under this warranty shall be limited to such adjustment as Seller may ob tain from the original manufacturer This limited warranty is void if equipment is modi fied or repaired without authorization subjected to Page 29 misuse abuse accident water damage or other neglect or has had its serial number defaced or re moved No obligation is assumed by LOGITEK to update previously manufactured equipment Specifications are subject to change without notice EXCEPT AS SPECIFICALLY PROVIDED HEREIN LOGITEK MAKES NO WARRANTY REPRESENTATION PROMISE OR GUARANTEE EITHER EXPRESS OR IMPLIED STATUTORY OR OTHERWISE WITH RESPECT TO THE EQUIPMENT USER DOCU MENTATION OR RELATED TECHNICAL SUP PORT INCLUDING THEIR QUALITY PERFORMANCE MERCHANTABILITY OR FIT NESS FOR A PARTICULAR PURPOSE IN NO EVENT WILL LOGITEK BE LIABLE FOR INDI RECT SPECIAL INCIDENTAL TORT ECONOMIC COVER OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF OR INAB
19. the corners of the front panel Plastic washers should be used to keep the mounting screw for marring the front panel finish Desktop Enclosure The Ultra VU desktop enclosure is designed to sit on any flat surface The front of the meter may be an gled up for easier viewing by raising the bale located on the bottom of the box While flow through ventilation is not necessary the units should not be mounted directly above equipment which produces significant heat such as equipment using vacuum tubes The unit should never be operated if the ambient temperature is above 55 degrees C 131 degrees F 2 5 Connecting Mains Power Connect the meter to the power mains with the en closed power cord The unitis factory setfor 115VAC Page 5 operation unless specifically labeled otherwise but 230VAC operation can be selected via a slide switch located next to the power transformer inside the unit To gain access to the voltage select switch remove the enclosure top cover The switch is located adja cent to the large power transformer 2 6 Input Selection on Dual Input Models If the digital receiver can lock onto an input signal then the meter will display that signal whether it con tains errors or not If no signal is connected to the digital input or the data rate is out of the receiver s capture range then the meter will display the analog signal This happens even if nothing is connected to the analog inputs The Ultra
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22. A second set of orange markers indicate the de sired peak operating level Switches 3 4 and 5 set these markers a fixed number of dBs above the zero reference level Ultra VU Operation amp Service Manual Peak Marker Setting Sw3 Sw4 Sw5 Function Up Up Up 18dB above reference Up Up Dn 16dB above reference Up Dn Up 14dB above reference Up Dn Dn 12dB above reference Dn Up Up 10dB above reference Dn Up Dn 9 dB above reference Dn Dn Up 8 dB above reference Dn Dn Dn Off Switch 1 turns the peak display on and off This is a single red dot with a fast attack time and a slow re lease time Peak hold is controlled from the front panel and is unaffected by switch 1 Switch 2 sets the dynamics of the peak display True peak shows the largest single peak This mode is useful for avoiding digital clipping PPM mode averages the peak read ing over ashortperiod and is comparable to PPM me chanical meters The green average display is unaffected by switch 2 and is always VU response Bargraph Settings Sw1 Sw2 Function Up Peak display OFF Dn Peak display ON Up True peak dynamics Dn PPM dynamics The programming switches are only checked oc casionally so it may take up to two seconds for switch changes to be reflected in the meter s operation Page 6 SECTION 3 OPERATING INSTRUCTIONS 3 1 Bargrap
23. C25 and an inter nal driver IC11 Pin 43 is a buffered output of the oscillator Ultra VU Operation amp Service Manual The first thing the DSP IC11 does after reset is copy its program from EPROM IC10 to internal RAM memory The program executes continuously Note that the 8 bit data bus is connected to the middle byte of the DSP s 24 bit data port Address decoder IC9 is used to reset the watch dog timer IC8 and to connect the rear panel pro gramming switches S1 S8 to the data bus via resistor pack R20 Front panel pushbutton switches S11 and S12 are connected to the DSP data port via resistor pack R19 Serial data is sent synchronously data clock load to the display driver chips via display connector P6 in 32 bit strings Data is placed on the top bit of the DSP data port and clocked into the display drivers via a write to address decoder IC9 Other writes to IC9 will load the 32 bit data string into the display drivers via P6 A write to the left bargraph will also be de coded by IC8 and used to rest the watchdog timer The audio from the left input XLR connector J1 is connected to a RF lowpass filter formed by R10 R11 C1 and C2 The resistors also form a 9 dB pad with the input impedance of the balanced receiver IC3 IC3 provides an additional 6 dB pad between its in put and output These pads allow 20 dBu input sig nals to be handled by the 5 volt supply rails The output of IC3 is unity gain in
24. ER C84 94 cd Oo 0 0 0 Ca 8S LS HOLIMS diq IMdN HOI Page 22 Ultra VU Operation amp Service Manual ze 3 L6 Inf vZ De gro9z 91 D SYSLAN LAGNI IAG JOJ 20v RS ES KI cel Y _ T S0164 S e 6 ELN lt 39 Z SES O b E _ ia ke Ly e p _ avag E nd N os V e5 ane 3113333 5 E Lda Oz ez QNO Q INDV LSM SE 1sy ERN 9 Sca Cy TENE e v d 2 Liv c po 5 ZPO qo NI JO 12 i 7419 z 5 lt B m so78z 1 DG PPAV Cd OG L 991 c 00 Ny S avie Ol Sd r lt oNoq y Sd 3119333 m L Lo L P Le 7 Ena Izox zzo 929 D 9 Sz ZPPAQ Sandy E ZLO11L 9 yA azi Zidvo 4 S anoa dol INNOYD L LO Sco de SISSVvHO EIE 4 L ozoL 619 8 PN GE s E LL f LdVvo del 1 P BAO do t doozz EIER IS OZZv 93 ES MLZ Zo 89 gi sy y i OL 934 5 Hy ZZ XU IA L 200 ASA 200 Ald gsn 7 SNNVHO NN DER 8 a LHOIY L viN c 6 d avag LLO NO 298b l LNY
25. F lowpass filter formed by R10 R11 C3 and C4 The resistors also form a 9 dB pad with the input impedance of the balanced receiver IC4 IC4 provides an additional 6 dB pad between its input and output These pads allow 20 dBu input sig nals to be handled by the 5 volt supply rails The output of IC4 is unity gain inverted by op amp IC2b and fed back to the reference input of IC4 This en ables IC4 to present an identical resistive load on its two input pins Input gain is adjusted via trimpot R9 which is the feedback resistor around gain stage IC1b MPDORTANT Only replace IC2 with an op amp which is slower than the SSM2143 such as the TL072 used here A faster op amp like the NE5532 will cause the output of 1C4 to oscillate k ck ck ck ck ck ck ck ck ck Ck ck Ck ck ck Ck Ck Ck Ck ck Ck ck ck kk k ok Signal from IC1b is fed through antialias filter R14 C8 and DC isolated by C11 before connecting to the left input of the sigma delta analog to digital converter IC7 The right channel connects to the converter via similar circuitry The 12 288 MHz master clock input to the ADC is generated by a crystal oscillator located on the DSP control card Combined left and right audio data is sent synchronously data clock frame sync to the DSP in 64 bit strings via connector P3 The reset sig nal from the DSP control card is also connected to the ADC The DSP activates the reset once a day which causes the ADC t
26. ILITY TO USE LOGITEK PRODUCTS EQUIPMENT OR SERVICES INCLUDING WITHOUT LIMITATION DAMAGES OR COSTS RELATING TO THE LOSS OF PROFITS BUSINESS GOODWILL DATA OR COMPUTER PROGRAMS EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES IN NO CASE SHALL LOGITEK S LIABILITY FOR MONEY DAMAGES EXCEED THE AMOUNT PAID BY YOU FOR THE LOGITEK EQUIPMENT OUT OF WHICH SUCH CLAIM AROSE THE FOREGOING LIMITA TIONS SHALL NOT APPLY TO CLAIMS RELATING TO DEATH OR PERSONAL INJURY WHICH ARISE OUT OF PRODUCTS DEEMED TO BE CONSUMER GOODS UNDER APPLICABLE LAW Some states or provinces do not allow the exclu sion or limitation of implied warranties or limitation of liability for incidental or consequential damages so the above exclusion or limitation may not apply to you The warranty and remedies set forth herein are ex clusive and in lieu of all others oral or written ex press or implied No Logitek dealer distributor agent or employee is authorized to make any modifi cation or addition to this warranty Ultra VU Operation amp Service Manual
27. NOIS NAS SO Z PESO TVWHON STVN2IS NAN ANFDAT TVNIDIS 121 Ultra VU Operation amp Service Manual Page 19 Page 20 96 10A v WDJBDI 1ueuoduoo 8692 9 ino 13 131 NAS Cur 041005 0ng 10 610 NAN NAS Id ELO LIO 100 39VWI NAS INO AV IdSIQ NAN 9d AE j Q d 991 a O m CO Q Or Os Q ME B O qe o m S S CA O E Ae S 9 dolum el Joan s g Je s ndul ay oj ED Jo A amp 90 0 ci gP 0c pp 0 9 9 suid j2euuo z ci E pejqestp si 90A S g ey
28. PARATION FOR USE 2 1 Initial Inspection Check the shipping carton carefully for external damage If the carton shows evidence of abuse ask the carrier s agent to be present when the unit is un packed Carefully unpack the unit to avoid damaging the equipment through the use of careless proce dures Inspect all equipment for damages immediate ly after unpacking Bent and broken parts dents and scratches should be noted If damage is found refer to paragraph 2 2 for recommended claim proce dures Keep all packing material for possible future use 2 2 Claim If the unit has been damaged notify the carrier im mediately File a claim with the carrier and advise Lo gitek of such action to arrange for repair or replacement without waiting for a claim to be settled with the carrier 2 3 Repacking for Shipment If the unit must be returned to Logitek attach a let ter to it showing the owner s name and address A de scription of necessary service should be included in the letter The original shipping carton and packaging materials should be used for reshipment if possible Use FRAGILE labels on each surface Return the unit freight prepaid Be sure to insure the unit for its full value The unit will be repaired promptly and returned freight prepaid 2 4 Installation Rackmount Enclosure The Ultra VU rackmount models are designed to be mounted in a standard 19 equipment rack by us ing the four mounting holes in
29. V SMD 25pf 1000V ceramic 15pf 1000V ceramic CE CW 20C473K AV TAP106K025HSB NC NMC1206Z5U104M50T CE DD 250 CE DD 150 Ultra VU Operation amp Service Manual SYMBOL DESCRIPTION LOGITEK PART NUMBER Diodes D1 2 5 4V zener Gl 1N4734A Integrated Circuits 1C1 AES EBU receiver without uP port CS CS8412 CS IC2 5VDC regulator 100 mA MO MC78L05ACP IC3 5VDC regulator 1 5A MO MC7805CT 1C4 Watchdog timer uP reset MM MAX1232CPA IC5 PROM 128K 120ns MC 27C128 12 L IC6 DSP 16 bit 2K 1K AD ADSP 2101KP40 IC7 3 to 8 decoder SMD MO MC74HC138D 1 pc 8 pin dip socket EM 100 083 10 1003 1 pc 32 pin PLCC socket EM 150 032 11 02 1 pc 68 pin PLCC socket EM 150 068 11 02 Connectors Ji 3 pin large socket PN CE156F20 3A J3 3 pin socket 2 pcs PN CE100F28 3A J5 7 10 pin dual row socket PN 050 010 455 J1 Female XLR NT NCSFK H P2 Male XLR NT NC3MK H P3 6 pin header PN MFSS100 6A P4 3 pin large header locking PN MFLS156 3A P5 7 10 pin dual row header PN 051 010 153 Crystal YA 12 288 Mhz crystal CT MP122 Resistors H1 2200 R2 110 R3 75 R4 1000 R5 6 100K R7 8 100K 2 5 position bussed CT 770 61 R104 R9 10 20K 8 position isolated SMD CT 767163203G R11 12 10K Switches S 1 8 Dip switch block CT 194 8MST S 12 13 Dip switch block CT 194 2MST Transformers T1 AES EBU SS 67129600 1 pc Ultra VU Dual Control circuit card LG 265 5 4 Display Assembly C1 C2 3 C4 C5 C6 8 D1 62 D63 D64 125 D126 D127 141 Capacitors 10uf 25V tant
30. Y a Lo gitek ULTRA VU LED BARGRAPH AUDIO METER Operation amp Service Manual Logitek Software License Agreement The Ultra VU unit you have purchased contains embedded software The software is owned by Logitek Electronic Systems Inc and is pro tected by United States copyright laws and international treaty provi sions Logitek grants to you the right to use one copy of the embedded soft ware in each Ultra VU meter you purchase You may not rent or lease the software You may not reverse engineer decompile disassemble or cre ate derivative works from the software You may not create copies of the software This statement will be governed by the laws of the State of Texas U S A Logitek reserves all rights not specifically granted in this state ment All information contained herein is confidential No portions of this man ual may be reproduced by any means without written permission from Logitek Electronic Systems Inc COPYRIGHT 1995 LOGITEK ELECTRONIC SYSTEMS INC i a Logitek Electronic Systems Inc 5622 Edgemoor DRIVE o HOUSTON TX 77081 USA x 800 231 5870 OUTSIDE USA 8 CANADA 713 664 4470 FAX 713 664 4479 Ultra VU LED Meter OPERATION amp SERVICE MANUAL icri d 1 GENERAL INFORMATION Tech General Di AA res dX Veen IR Hed e OUS RE AR 3 1 2 Electrical Specifications liliis 3 T3 cheE EE 3 1 4 Instrument Identification
31. alum 1 uf 50V Z5U SMT 1206 100uf 20V tantalum 10uf 25V tantalum 1 uf 50V Z5U SMT 1206 Diodes Tricolor LED bar 2mm x 5mm AV TAP106K025HSB NC NMC1206Z5U104M50T AV TAP107K020CCS AV TAP106K025HSB NC NMC1206Z5U104M50T SY VBRG5641X order by brightness number on display card Red LED bar 3mm x 6mm Tricolor LED bar 2mm x 5mm QT MV57124A SY VBRG5641X order by brightness number on display card Red LED bar 3mm x 6mm Yellow LED bar 3mm x 6mm Ultra VU Operation amp Service Manual QT MV57124A QT MV53124A Page 14 SYMBOL DESCRIPTION LOGITEK PART NUMBER IC1 5 IC6 P1 P2 3 J1 J2 3 6 pcs 1 pc 5 5 _ ADC Input Card C1 4 C5 6 C7 8 C9 12 C13 14 C15 C16 17 C18 C19 C20 21 C22 C23 C24 25 C26 D1 2 1C1 2 1C2 3 IC5 IC6 IC7 4 pcs J1 2 J3 FR1 3 R1 2 R3 7 R8 9 R10 11 R12 R13 14 1 pc Page 15 Integrated Circuits 64 LED driver 5VDC regulator 1 5A Connectors 10 pin dual row header 3 pin header 10 pin dual row socket 3 pin socket Resistors 5100 Switches pushbutton 62 pin SIP socket Display circuit card Capacitors 75pf 1000V ceramic 4 7uf 25V tantalum 2200pf 50V ceramic SMD 1uf 35V tantalum 4 7uf 25V tantalum 1 uf 50V ceramic SMD 470pf 100V ceramic SMD 1 uf 50V ceramic SMD 01uf 1uf 35V tantalum 01uf 1 uf 50V ceramic SMD 470pf 100V ceramic SMD 1 uf 50V Z5U SMD 1206 Diodes 5 4V zener Integrated Circuits Quiet
32. anel EMPH indicates pre emphasis has been applied to the audio and is recovered from the embedded channel status data The circle is lit only when em phasis is detected The indicator is accurate with both AES EBU and S PDIF input formats PRO indicates whether the data stream is in the professional or consumer format and is recovered from the embedded channel status data The circle is lit only when the AES EBU professional format is de tected SAMPLE RATE is the actual data sample fre quency measured by the meter in one second inter vals This function is active even when the received data is invalid mple Rate Data Disp Label Meaning 32 0 32 000 Hz 1 44 0 44 056 Hz 1 44 1 44 100 Hz 1 47 9 47 952 Hz 1 48 0 48 000 Hz 1 none no data or non standard rate 3 9 Changing Display Brightness The overall illumination level of the meter can be set to one of eight levels To change the brightness level press the MODE button until the BRT indicator lights Then press the HOLD button until the desired illumination level is achieved 3 10 CLIP indicator set point The large red clip segment atthe top of each bar graph can be setto light on the reception of either one Ultra VU Operation amp Service Manual or four clipped samples in a row To change the set ting press the MODE button until the CLIP indicator along the bottom o
33. ars disappear 3 3 PPM Display Peak program meter PPM information is shown by asingle red segment PPM represents the highest point of the input signal The display has a zero rise time and an industry standard 2 8 Sec per 24 dB fall time The dot will appear to fall faster near the top of the meter range because each segment there repre sents fewer dBs than at the bottom of the meter The PPM display is always active unless it is turned off by the programming switches on the back panel The VU and PPM displays are calibrated so that they will read the same when connected to sine wave signals The red PPM dot will be on top of the highest green segment of the VU bar resulting in a bright or ange dot For dynamic signals the difference be tween the top of the VU bar the PPM dot is approximately the crest factor 3 4 Peak Hold Display The peak hold display is a single red segment that maintains the highest PPM reading for a user se Page 7 lectable amount of time If the holding period expires before the PPM dot equals or exceeds the peak hold dot then the peak hold dot will turn off It will turn on again when the PPM dot reaches a peak and starts falling again Two holding modes are available Release Rel mode holds the peak reading for either 2 or 5 seconds depending on the position of the rear panel program switches Maximum Max mode holds the highest peak reading until it is manually reset by turning the peak hol
34. charge protection special care must be taken in the handling of these devices particularly in dry environments MDORTANT Do NOT remove or handle CMOS integrated cir cuits except in a grounded environment which is free of the risk of static electricity Store such circuits on conductive foam or in anti static controllers Do NOT store on styrofoam or other plastic sheets Improper handling may damage these devices ok ck ck ck ck ck ck Ck ck ck Ck ck Ck ck ck Ck Ck Ck ck ck Ck ck Ck kk ko ko Page 9 4 4 Access to Circuit Cards Access to the circuitry of the rackmount and half rack meters is accomplished by removing the six screws that attach the top cover The inside of the desktop unit is accessed by removing the four screws along the edges ofthe bottom panel and pulling apart the two halves of the plastic case 4 5 Power Supply LG 253 Each Ultra VU contains a ground isolated and fil tered step down power supply to create the neces sary operating voltages This supply is located on a PCB on the right side of the meter enclosure Mains AC from the power entry module J2 is fed through fuse F1 located in a drawer under the power cord in J2 to J1 on supply card LG 253 J1 feeds volt age selection switch S1 which connects the dual pri maries of transformer T1 in series for 230VAC operation or parallel for 115VAC operation The dual secondaries of T1 are wired in parallel and loaded with a full wave bri
35. ctrolytic Integrated Circuits Charge pump 8 pin dip socket Rectifiers 6A pc mount 240V Fuses 1 2 amp slow blow 20mm Connectors 3 pin large header locking 3 pin large socket Power entry module fuse holder Switches Slide DPDT Transformers 8V 3A international rating Super VU Supply circuit card Power card North America Capacitors 75pf 1000V ceramic 1uf 35V tantalum 2200pf 50V NPO ceramic SMD 4 7uf 25V tantalum 1uf 50V ceramic SMD 01uf 50V ceramic SMD 470pf 50V NPO ceramic SMD 2200pf 50V NPO ceramic SMD 1uf 35V tantalum 75pf 1000V ceramic 470pf 50V NPO ceramic SMD 1uf 50V ceramic SMD 4 7uf 25V tantalum 1uf 50V ceramic SMD 01uf 50V ceramic SMD 1uf 35V tantalum 10uf 25V tantalum Ultra VU Operation amp Service Manual LOGITEK PART NUMBER IL 688LBA025M2CD NC 100MF50ME2 NI UFS1E101MPJ TI LT1054CN EM 100 083 10 1003 GI GBPC 602 LF 218 500 PN MLSS156 3A PN CE156F20 3A SR 6200 4115 CK L202 121MS02QE SI IF 24 16 LG 253B BE 17251 CE DD750 AV TAP105K035HSB NC NMC1206NPO222K50TR AV TAP475K025CCS NC NMC1206Z5U104M50T AV 12065E103MATMA AV 12061A471JATMA NC NMC1206NPO222K50TR AV TAP105K035HSB CE DD750 AV 12061A471JATMA NC NMC1206Z5U104M50T AV TAP475K025CCS NC NMC1206Z5U104M50T AV 12065E103MATMA AV TAP105K035HSB AV TAP106K025HSB Page 12 SYMBOL DESCRIPTION LOGITEK PART NUMBER C25 15pf 1000V ceramic CE DD 150 C26 25pf 1000V ceramic CE DD 250 C27 29 1uf
36. d off and then on again Peak hold can be cycled through Off Rel and Max modes by repeatedly pressing the HOLD button at the lower right corner of the meter front panel 3 5 LOUD Loudness Filter The VU display can be compensated to match the frequency response of the human ear by enabling the loudness filter This will cause the VU bars to more closely represent the actual loudness perceived by the listener and allow better level matching between different kinds of program material The loudness filter is calibrated for a listening level of 58dB SPL The filter will be less accurate for listen ing levels above and below this point To activate the filter press the MODE button in the lower left corner of the meter front panel until the Loud indicator is lit Users of the digital input meters should note that filtering is a function of sample rate The meter has a separate filter for each of the five sample rates listed on the front panel If a non listed sample rate is used the loudness filter will be deactivated 3 6 1 S Image Sum Display The image and sum displays are activated by pressing the MODE button in the lower left corner of the meter front panel until the o indicator if lit In this mode the lower bargraph displays the mono sum of the left and right input channels The display operates identically to the left and right bar graphs except that the loudness filter is not available The upp
37. dge rectifier RT1 The DC output of RT1 is filtered by capacitors C1 and C2 and fed to the red and green output pads The voltage should be be tween 8 to 10 VDC with less than 5 volt of ripple Analog input models will also have a charge pump consisting of IC1 and C3 that feeds filter C4 and the black output pads The voltage should be 8 to 10 VDC with less than 1 volt of ripple Jumpers soldered to the output pads feed power to one or two meter control cards WARNING Dangerous voltages are present on the bottom of the power supply card Always disconnect the AC power cord when servicing this circuit board ock ck ck ck ck ck ck ck ck ck Ck ck Ck ck ck Ck ck Ck ck ck Ck kk kk ko kk 4 6 Analog Input Control Card LG 266 7 VDC from input connector P4 is connected to voltage regulators IC12 and IC5 as well as display board connector P6 1C12 feeds the digital section of the PCB while IC5 feeds the analog front end 7 VDC from input connector is connected to voltage regula tor IC6 which feeds the analog front end On power up the DSP is kept in reset by IC8 until the power has stabilized ensuring a good power on reset IC8 also contains a watchdog timer that will re set the DSP if its ST pin is not taken low at least once every 150 mSec This pin is normally pulsed low every 5 mSec by the left bargraph load signal The DSP IC11 is clocked by a 12 288 MHz crys tal oscillator consisting of Y1 C26
38. ep sas wasaqa orii Guau 8 4 7 Digital Dual Input Control Card LG 265 9 4 8 Display Assembly LG 267 10 4 9 ADC Input Card LG 264 10 SECTION 5 REPLACEMENT PARTS LIST 5 1 Power Supply s srai anie naaa A a a a Ta da a aE aa aia 11 5 2 Analog Input Control Card 11 5 3 Digital Dual Input Control Card 12 5 4 Display Assembly 13 55 ADG Input Card IAA Cr uie ees 14 SECTION 6 MANUFACTURERS LIST SE HON 7 DIAGRAMS 2 7 3 7 4 7 5 Power SUPPI sc Age ee es ad es Howe AAA acetals oad 17 Analog Input Control Card 19 Dual Input Control Ca 21 Display Assembly 23 ADC Input Gard lt as aiaa cata a ees eee Ba Deda A aod 27 SECTION 8 QUICK REFERENCE GUIDE SECTION 1 GENERAL INFORMATION 1 1 General Description The Logitek Ultra VU is abargraph type audio me ter featuring two tricolor LED bargraphs with clip indi cators Two function buttons and several auxiliary data indicators are also included on the front panel 1 2 Electrical Specifications Bargraphs per meter Two Indicators per bargraph 63 Normal Range 70 dB to 0 dB plus clip digital 50 dB to 20 dB plus clip analog 2 dB per segment around ref pt 10 12 14 16 18 or 20 dB Fine Range Reference Point
39. er bargraph shows the stereo image and relative phase information Three orange markers are located at 90 degrees left 0 degrees center and 90 degrees right The scale covers 180 degrees which is the largest relative phase difference two sig nal can have The red dot indicates the current location of the left channel in the stereo sound field and the green dot in dicates the current location of the right channel in the stereo sound field The overall width and location of the stereo image is shown by a second pair of red and Ultra VU Operation amp Service Manual green segments that hold the furthest left and right readings for about four seconds Ifa mono signal is being displayed then the red and green segments will be at the same location re sulting in adot that looks orange If the mono signal is off center such as left channel only the resulting or ange dot will be off to one side of the display 3 7 FINE High Resolution Mode Fine is a high resolution mode that expands the meter scale to 2 dB per segment around the 0 VU point This mode is useful when doing precise align ments using steady state signals Fine is activated by pressing the MODE button at the bottom left of the meter front panel until the FINE indicator lights 3 8 Auxiliary Data Display Ultra VU models with serial digital inputs provide information about the input data format via indicator lights along the bottom of the meter front p
40. eration amp Service Manual os 6z s EE WNOYA3 si kE Sag es lord l s9 vi 07 6 e A zs e lt lt e 9 N c3 za sa za pP n Y o c S N zo 90 sa 9a m ac es zu D I so oio sa S 96 d8S GZ L in EI s D oo vs c e soe S N va tla va velvntil sno L o S N a zia sa EL y E dine za o z o Dun el za sia za EL v asez 91 T l ane o N S ta via ta St z st a 0 1 98 94 L si hi se oo 3 notes Guvod IOYLNOO PELNI zo i Sa o n e zou iza Beie OXO T es oF is S INdNI IVANA Pec so18z 6 Bake 98 oza eb Zo INN eia 6 6 ONN glia r1 7 BK ONS ziar kill WAT ans 91a HOOF 001 ano ES ep gH za v s ok Se ae Pues mos Zia ooA 8 N1379 Lal S N Es Se 9 E Ly eS sz LHM LHM is lsa qx 1S41 30 ed zHnesz zt L yg ov tz ez E Ee ZETLXVN sdSZ LA ELI zz FEIS 9 T LHM LHM 91 LLO oz Lon Mrd ov ssa cd es e ze v v OO N A H Ee eviz t el CTS i Xo r iss 3qom T Ona ana mol tdsia 9e S 5700 Ev EV zv zv yolg ta 28 gd un Ye SH SEI eee a ak ET T Yoo Givaanaton T AN9 AND gt e rasta QF AI 1nox35 sv sv vv yy O sa 2881 EES WS CH SE Soya ov ov sv sv voi ya gt AO A 1YOd ts
41. f the meter lights A segment in the lower bargraph will start to blink alternately red and green to indicate the current setting Press the HOLD button until the desired setting is shown on the bar graph 3 11 Resetting the Program The Ultra VU contains software that executes on a programmable DSP chip If the processor memory becomes corrupted the meter will probably fail to op erate In most cases an independent watchdog cir cuit will notice that the meter is working incorrectly and restart the system The processor can be reset manually by turning the power off and then back on again NOTICE kk ko k ko k k k k xk Once a day the display will freeze for a second while the meter goes through a reset and the analog to digital converter recalibrates itself kk ck ck ck ck ck ck Ck ck ck Ck ck Ck Ck ck Ck Ck Ck Ck ck Ck ck ck ck ko ko Page 8 SECTION 4 MAINTENANCE 4 1 General Information The Ultra VU is designed to need a minimum of maintenance for long trouble free operation Should repair be necessary the technician should first read the information in the manual concerning the circuits in question and should follow proper procedures for testing and replacing semiconductors Logitek engi neers are readily available at the factory to provide technical assistance both during and after the war ranty period WARNING The inside of the Ultra VU contains no controls or user se
42. ge regulators IC2 and IC3 as well as display board connector P6 IC2 is a 5VDC regulator that feeds power to the analog front end of data receiver IC1 The voltage is filtered by C2 C6 and clamped against over voltage and voltage reversal by D1 IC3 is a 5VDC regulator that feeds the digital portion of IC1 and all other circuits on the control board The output voltage is filtered by C3 and clamped by D2 Distributed power filtering is supplied by C4 7 8 9 amp 10 On power up the DSP is kept in reset by IC4 until the power has stabilized ensuring a good power on reset IC4 also contains a watchdog timer that will re set the DSP ifits ST pin in not taken low at least once every 150 mSec This pin is normally pulsed low every 5 mSec by the left bargraph load signal The DSP IC6 is clocked by a 12 288 MHz crystal oscillator consisting of Y1 C11 C12 and an internal driver IC6 pin43 is a buffered output of the oscillator The first thing the DSP IC6 does after reset is copy its startup program from EPROM IC5 to internal RAM memory That program executes once and then loads the main program from EEPROM which exe cutes continuously Note that the 8 bit data bus is con nected to the middle byte of the DSP s 24 bit data port The rear panel programming DIP switches S1 S8 are also connected to the DSP s middle data byte via isolation resistors R10 and control that portion of the data bus when neither the DSP nor the EEPROM out put
43. h Description The Ultra VU display contains two multi LED bar graph displays mounted one above the other The top bar shows either left channel L or image phase b information The bottom bar shows either right chan nel R or mono sum S information The bars are marked at the left end to indicate their function The tricolor LEDs can be green red or orange depending on their function and cover the range from 70 dBFS to 0 dBFS The top LED of each bar is larger and red only It is used as a clipping indicator and can be set to illumi nate on any clipped signal or only after four consecu tive clipped samples The zero reference point of the meter is indicated by a dim orange marker in the bargraph The refer ence mark can be varied between 10 and 20 dBFS via switches on the back panel An optional peak marker can be set from 8 to 18 dB above the zero reference and is used as a reference indicator for the PPM display 3 2 VU Display VU is indicated by a solid green bar VU represents the perceived loudness of the input signal The mo tion of the bars conforms to the industry standard 300 mSec per 20 dB rise and fall times Note that the speed of the bar will appear faster near the top of the meter display because each segment there repre sents fewer dBs than at the bottom of the meter The VU display can be turned off by pressing the MODE button at the bottom left corner of the front panel re peatedly until the VU b
44. is active The DSP inputs the switch positions via a read to address zero Front panel pushbuttons S11 12 13 are connected to the high byte of the DSP 24 bit data port via con nector P3 and isolation resistors R9 Serial data is sent synchronously data clock load to the display driver chips via the display con nector P6 in 32 bit strings Data is placed on the top bit bit 23 of the DSP data port and clocked into the display drivers via a write to address decoder IC7 Other writes to IC7 will load the 32 bit data string into the left bargraph right bargraph or scale indicator driver groups via P6 A write to the left bargraph will also reset the watchdog timer Two channel audio data is fed synchronously data clock frame sync from digital data receiver IC1 to DSP IC6 serial port 1 Encoded audio data enters the meter via XLR con nector J1 and is directly connected to the output con nector P2 Note that no buffering is applied to the loop through output Page 10 The input data signal is connected to pulse trans former T1 via DC blocking capacitor C5 The output of T1 is loaded by R1 R2 R3 and connected to data re ceiver IC1 C1 and R4 form a loop filter used by IC1 to recover the embedded clock from the coded input signal IC1 separates the audio data channel data and clock from the input data The audio is sentto the DSP in 64 bit strings via a serial port Three other sig nals from IC1 are read once per stereo sa
45. mple and are connected to the DSP s parallel data port via iso lation resistors R9 These are the channel status bit start of subcode data block flag and receiver error flag These are input to the DSP via a read to address zero Connector P5 attaches to the DSP s other serial port and allows analog data to be sent to the DSP via an external ADC card The connector also provides power and the master processor clock for use by the ADC card If the digital receiver IC1 can lock onto an input sig nal then the DSP will display that signal whether it contains errors or not If no signal is connected to J1 or the data rate is out of the receiver s capture range then the DSP will display the data from P5 This hap pens even if nothing is connected to the analog in puts or the ADC card is absent 4 8 Display Assembly LG 267 Filtered power is connected to the driver card via P1 5VDC regulator IC6 is bolted to the meter enclo sure to increase heat dissipation and connects to the driver card via P2 C4 provides bulk power storage while C1 C2 C3 and C5 through C8 stabilize the 5 volt supply Each display driver IC controls 64 LEDs by scan ning them in an eight by eight matrix Segment lines are current controlled and connect to the LED an odes Digit lines connect to the LED cathodes Scan ning is accomplished by taking each digit line low one atatime and sourcing current from the segment lines for whichever of the 8 LEDs in a digit g
46. o perform a self calibration routine for about half a second If the meter has undergone a substantial temperature change it may generate noise up to 70 dBFS until it undergoes a calibration cycle The three supply voltages from P3 are EMI iso lated by ferrite beads FR1 FR2 and FR3 before con necting to the other circuitry IC5 and IC6 supply low noise regulated 4 5 VDC to the analog portions of the circuit The digital part of the data converter gets its 45 VDC from the DSP control card Ultra VU Operation amp Service Manual SECTION 5 REPLACEMENT PARTS LIST All replacement parts are stocked in depth at the Logitek factory Most are also available through local electronic parts distributors For your convenience in purchasing replacement parts locally we include the following parts list All Logitek part numbers consist of a two letter manufacturer code followed by that manufacturer s standard part number for the item A list of manufacturers arranged alphabetically by manufacturer code follows this parts list in Section 7 All resistors are 1 4 watt 5 tolerance unless otherwise noted YMBOL 5 1 Power Supply C1 C2 C3 4 IC1 1 pc RT1 F1 P1 J1 J2 S1 1 pc 1 pc 5 2 _ Analog Input Control Card C1 2 C3 C4 C5 C6 C8 C9 10 C11 C12 C13 14 C15 16 C17 C18 20 C21 C22 C23 C24 DESCRIPTION Capacitors 6800 uf 25V electrolytic 1uf 50V ceramic disc 100uf 25V ele
47. ogy Inc Chandler AZ MM Maxim Sunnyvale CA MO Motorola Semiconductor Products Phoenix AZ MP Mepcopal San Diego CA MU Murata Electronics Smyrna GA NC NIC Components Corp North Amityville NY NI Nichicon Schaumburg IL NK NKK Switches Scottsdale AZ NT Neutrik Lakewood NJ PR Mill Max Mfg Preci dip Oyster Bay NY PN Panduit Corp Tinsley Park IL QT Quality Technologies Sunnyvale CA SG Signetics Corporation Sunnyvale CA SI Signal Transformer Inwood NY SR Schurter Inc Petaluma CA SS Schott Corp Minneapolis MN SW Switchcraft Inc Chicago IL SY Stanley Battle Creek MI Tl Texas Instruments Inc Dallas TX Ultra VU Operation amp Service Manual Page 16 SECTION 7 Diagrams Page 17 Ultra VU Operation amp Service Manual 56 91 vo UDP woibo1q uauodwog AlddNS DnAn nA8 n S YGE ATSE CAN PiS est s ATddnNS H3MOd S opou uo pesn Sud s n DpA s ul S epou K uo indui 103 B1p uo pesn you Ol 310N 20A6 CER s Soile _ 001 Obad 11 a E VO Lol z g 2 OVA ov E ANO li dez gt SLL 0089 S L Tr NX binl ooge V zm ST e eg mem 1 l OCGA6d DN SLP LMS Gay ZO9 D489 B 2 TR ble un mo g o z e duo 9L vZ 31 Q e Ste LA LMS lla Page 18 Ultra VU Op
48. os s oz 3991 1s3 070H 489 AND Q gdsia CC SAS 9 20 ap ONTOS iwis Y 9v 9v SOI sg 28 ced 1431 s osaa 8v s8v Lv Ay 901 9a Q Sd E PUO St za ev S ev av lay MEDS oo AY3d 3QOW Ons ag zdsig OO Saud iva N3S vy ee gz 97 3s vis HANSON ou 1M oiv OLV ev 6v S N S N es ve vz Zt AAS AAN AAS NAN ino avil9 ad s avo ec swa MISSE tty oy JO LW S N zi S N e AS DAS e S MS AN zd e swa EISE e LEY S N S N puaBaT PUBIS id a tO und jues ue pasen DECH 6 05 Oj S aa A tet s r S N T S N 1972 peipoo S uo peio99 s MS mpm lOLZ dSQVe ziv eiv uM L O0NVOB Ol 7VNN31X3 EST rie 99 S st ot m EE L NXX sol is c 015 Ze z joi iva sss 8 o Gees ech TEM z i OL ansa L 9 bb 9 t yz ECH ANS 39YNI NAS FOroto o zi 92 ZE No SZ DOL 00zz avaa s Fvidsid 8 1 NAN 6 z s 8 5X auo FYA CECI ra 3118834 KR E ee E an ole t oro 6 Jer i zer s sje i 7 Let a1 geg 18 07 tilo azo s 1 axa Is HO ni 91 0 91 v8 1101 yy da zo YA St z gi ON S N L baa sae ba 319 935 Y 9 94 L 7189 LW so Sen a LE L St 00962 149 NI 1vLI910 x or cze 01 ZL z sz 1V189 Wr H VLL mi E S a aoz 3443 ew L a1 vi yl solzdsav NAS en N 82 En a L AIWISIO 3 3 nas otololo 91 0 d sio soale bolzdsav nan S N Aa IS n z q3sn LON MAN s z sje L 991 NO 310N S N beren Se n 17193 zwo v E La ole air z DEIER NASI Lo toto odo oy 51 fll nos a 00962129 9 lvivas 17192 l 6 SISIHINTIVA NI STV
49. roup need to be lit The driver chips can also selectively decode BCD data into 7 segment numeric display signals Maxi mum LED brightness is set by the external resistors The drivers further control brightness by pulse width modulating the LED on times with a value supplied by the DSP The display drivers accept synchronous serial data clock data load in 16 bit strings composed of an address byte and a data byte The driver ICs are arranged in two chip groups The data out of one chip is hooked to the data in of the second chip such that 4 bytes can be loaded two to each chip with one load pulse IC and IC2 drive the upper bargraph left chan nel IC3 and IC4 drive the lower bargraph right channel IC5 drives the scale indicator LEDs along the bottom edge of the display Page 11 Avoid removing all three LED alignment plates if at all possible There is very little space around the indi cator LEDs and if any get bent it can take some time to reassemble the alignment plate If a LED needs re placing pry it out of its socket with a screwdriver and remove it Remember to consult the component dia gram for the correct orientation before installing a new LED Also note that the tricolor LEDs are graded according to color and brightness A sticker on the back of the PCB denotes the correct lot number needed for reordering 4 9 ADC Input Card LG 264 The audio from the left input 1 4 phone connector J2is connected to a R
50. rviceable parts The cover should only be re moved by competent technical personnel capable of servicing this type of equipment Hazardous voltages exist on the underside of some circuit cards kk ck ck ck ck ck ck Ck ck ck Ck ck Ck ck ck Ck Ck Ck ck ck Ck ck Ck kk ko ko 4 2 Fuse The primary winding of the power transformer is fused with a 1 2 amp slow blow 20mm fuse housed in a fuse holder in a slide out drawer under the power cord on the rear panel of the unit It should only be re placed with fuses of the same type and current rating The power cord must be unplugged from the rear panel to gain access to the fuse holder WARNING Do NOT replace the fuse without first disconnect ing the meter s power cord from the wall socket as dangerous voltages are present which may cause electrical shock Always use fuses of the same value and type as specified in this manual Do NOT use fuses of a higher value than those specified as shock hazard and fire hazard may result ok kk ck ck ck ck ck ck ck Ck ck Ck ck ck Ck Ck Ck ck ck Ck ck ck kk ko ko A blown fuse is most often although not always a symptom of another failure Related circuitry should always be carefully examined after any fuse failure especially if a replacement fuse also blows 4 3 Handling of CMOS Integrated Circuits All logic components in the Ultra VU meter are CMOS type integrated circuits Even though all cir cuits have built in static dis
51. verted by op amp IC2a and fed back to the reference input of IC3 This en ables IC3 to present an identical resistive load on its two input pins Input gain is adjusted via trimpot H1 which is the feedback resistor around gain stage IC1a MPORTANT Only replace IC2 with an op amp which is slower than the SSM2143 such as the TL072 used here A faster op amp like the NE5532 will cause the output of IC3 to oscillate Ke A S E e Xx X k WX X X ko REE ko k k S S S O S kk OS BE Signal from IC1a is fed through antialias filter R15 C4 and DC isolated by C3 before connecting to the leftinputofthe sigma delta analog to digital converter IC7 The right channel connects to the converter via similar circuitry The 12 288 MHz master clock input to the ADC is generated by a crystal oscillator located on the DSP chip Combined left and right audio data is sent syn chronously data clock frame sync to the DSP in 64 bit strings The DSP reset signal from IC8 is also connected to the ADC The DSP activates the reset once a day which causes the ADC to perform a self calibration routine for about half a second If the me ter has undergone a substantial temperature change such as when it is first powered up it may generate noise up to 70 dBFS until it undergoes a calibration cycle Ultra VU Operation amp Service Manual 4 7 Digital Dual Input Control Card LG 265 Power from input connector P4 is connected to volta
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