2VUB/4VUB Mechanical Meters
Contents
1. 013 Ted 2 aun SIT 1040 MS JUN OEC 61a 24011 22011 A INO 8nny 404 31813559 Ort 6dr 2 43134 AZE E os T 4313U c6 2145 814 3929 zo 84 11 81 HOLIMS 1331 214 w N A L ezn ETONI u dan 24011 5928 68 VETUNI 24 ATZ ATZ 434 u33 TI 200711 2n 01 XOT ied Page 12 OVUB amp 4VUB Meter Instruction Manual Lo oitek 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 de fect i2. DESCRIPTION Capacitors 75pf ceramic 22uf 50V tantalum 47uf 10V non polar electrolytic 470uf 25V electrolytic 10uf 25V tantalum Diodes 5 6 volt zener 1 watt Integrated Circuits Balanced line receiver Fet op amp 5VDC regulator 5VDC regulator 8 pin socket Connectors XLR female pc 6 pin header 3 pin large header AC power entry 6 pin socket 3 pin large socket Fuses 1 4 amp slow blow 20mm Meters 2 1 2 VU 2 1 2 Light meter lamp 12 volt 100 mA Resistors 50K trim pot muli turn 3300 21K 1 4220 1 2100 1 4220 1 2100 1 Rectifiers 1A bridge 2 VUB amp 4VUB Meter Instruction Manual LOGITEK PART NUMBER CE DD 750 AV TAP224K050CCS NI UES1A470MPJ IL 477RMRO25 AV TAP106K025HSB MO 1N4734A AD SSM2143P TI TLO72CP MO MC79L05ACP MO MC78L05ACP EM 100 083 10 1005 NT NC3FK H PN MFSS100 6A PN MFSS156 3A SR 6200 4115 PN CE100F28 6A PN CE156F20 3A LF 218 250 SO AL29R WF bezel b scale SO 29 Light box 12VDC CM 8918 MP CT9X503 GI DF10M Page 7 SYMBOL DESCRIPTION LOGITEK PART NUMBER Switches SW1 DPDT slide CK L202 121MS 02QE SW2 3 2P pushbutton SH ZF142ueetb 0101 1201 Transformers T1 8V 750mA SI IF 6 16 1 pc 4VUB meter driver LG 246 1 pc IEC power cord North America BE 17251 2VUB amp 4VUB Meter Instruction Manual Page 8 SECTION 5 MANUFACTURERS LIST CODE MANUFACTURER LOCATION AD Analog Devices Inc Norwood MA AV A
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4. 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 express or implied No Logitek dealer distributor agent or employee is authorized to make any modification or addition to this warranty Page 13
5. 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 the necessary service should be included in the letter The original shipping carton and packag ing materials should be used for reshipment if possi ble 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 Mechanical Installation The 2VUB amp 4VUB are designed to be bolted into a standard nineteen inch equipment rack using the four front panel mounting holes 2 5 Connections to Rear Panel Terminal Block Inputs are connected to the meters via XLR con nectors on the rear panel The terminal functions are as follows Pin 1 Ground Pin 2 Input Pin 3 Input 2 6 Balan n nbalan Audi nnection Balanced sources can be connected to the 2VUB or 4VUB by following the and Ground designa tions listed above Note that all inputs are high imped ance bridging However a 600 ohm resistor can be strapped across any input that needs a low imped ance VUB amp 4VUB Meter Instruction Manual Unbalanced line level sources such as phono jack outputs can be fed to the 2VUB or 4VUB by connect ing the hot lead from the source to
6. RINCIPLES OF OPERATION 3 1 General Information llle RR RR ns 5 3 2 Access to Circuit Cards i5 saeua rp red ana cmd Rd awe RO dod do 5 9 9 Power SUpplyc cae xs De RE Rae Rx eR Sac V XE 5 3 4 IMeter lt 2 30 a Seed Aled oe he aes oe mes dod watt d ara 5 SECTION 4 REPLACEMENT PARTS LIST 4 1 2VUB amp 4AVUB RR RR RR RR RR RR es 6 SECTION 5 MANUFACTURERS LIST SECTION 6 DIAGRAMS 2 VUB amp 4VUB Meter Instruction Manual Page 3 SECTION 1 GENERAL INFORMATION 1 1 General Description The 2VUB dual meter unit contains two lighted VU meters in a self powered box The 4VUB quad meter unit contains four lighted VU meters in a self powered box Each meter has a high impedance balanced input with an adjustable gain control 1 2 Physical Description The 2VUB amp 4VUB enclosure is 3 1 2 inches tall and mounts in a standard nineteen inch rack enclo sure Audio and power connections are made to the rear panel of the unit 1 3 Electrical ification Frequency Response 20 hz 20 khz 0 5 dB Overall Gain minimum 10 dB Input Levels normal 0 dBu maximum 23 dBu Input Impedance balanced 50 000 ohms Dimensions meter bridge 31 2 19 Wx 6 D 1 4 Instrument Identification All Logitek 2VUB amp 4VUB meters are identified by a serial number This serial number appears on a label located onthe back panel near
7. VX Corp Myrtle Beach SC BE Belden Wire and Cable Richmond IN CE Centralab Philips Components Riviera Beach FL CK C amp K Components Watertown MA CM Chicago Miniature Lamp Inc Buffalo Grove IL EM Ecam Technology Scottsdale AZ GI General Instruments Quality Technologies Sunnyvale CA IL Illinois Capacitor Lincolnwood IL LF Littlefuse Inc Des Plaines IL LG Logitek Circuit cards Houston TX MO Motorola Semiconductor Products Phoenix AZ MP Mepco Electra Inc San Diego CA NI Nichicon Corporation Schaumburg IL NT Neutrik USA Inc Lakewood NJ PN Panduit Corp Tinsley Park IL SI Signal Transformer Inwood NY SH ITT Schadow Eden Prairie MN SO Selco Products Buena Vista CA SR Schurter Inc Petaluma CA 2 VUB amp 4VUB Meter Instruction Manual Page 9 SECTION 6 DIAGRAMS 2VUB amp 4VUB Meter Instruction Manual Page 10 SOT6L vELPNI Eq veLyNI TA MS SHA SOTSL un _ Mtoe LEA 1x9 ZLOTL oano m 9 L OI 2 O GND V NE Meee OCA goin 9 aM L 961 9 2 I 1X9 I ATE SEA 9 MOS MT6E pry ATOE seu SHA t I IX9 9 v lt ME STA 1 MOE MOS ITEE EA 89 NEE 9 ME ETA o T HX 1 KX 8df MOS xcot Mtoe HA ore 1X9
8. _ Logitek 2VUB amp 4VUB DUAL or QUAD VU METER Operation amp Service Manual All information contained herein is confidential No portions of this manual may be reproduced by any means without written permission from Logitek Electronic Systems Inc COPYRIGHT 1994 LOGITEK ELECTRONIC SYSTEMS INC 2VUB amp 4VUB Mechanical Meters Instruction Manual Table of Contents SECTION 1 GENERAL INFORMATION 1 1 General 3 1 2 Physical Description 4 x s a Lm ce ted dads bore edd 4A eh R E 3 1 3 Electrical 5 3 1 4 Instrument Identification llle RR 3 1 5 Where to Find Helpis ss ssec chad ane Rack nem ae ds 3 SECTION 2 PREPARATION FOR USE 2 1 lInrualnspectons s sex xp Rer pd e e ee ritate e Rt ee ha 4 2 GAINS a 4 2 3 Repacking for Shipment ses a tees 4 2 4 Mechanical Installation lee 4 2 5 Connections to Rear Panel Terminal 4 2 6 Balanced and Unbalanced Audio 4 2 7 Setting VU Level eo hn 4 2 8 Phase sene 4 SECTION P
9. arranty shall be limited to such adjustment as Seller may obtain from the original manufacturer This limited warranty is void if equipment is modi fied or repaired without authorization subjected to misuse abuse accident water damage or other ne 2 VUB amp 4VUB Meter Instruction Manual glect or has had its serial number defaced or removed 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 DOCUMEN TATION OR RELATED TECHNICAL SUPPORT IN CLUDING THEIR QUALITY PERFORMANCE MERCHANTABILITY OR FITNESS FOR A PARTIC ULAR PURPOSE IN NO EVENT WILL LOGITEK BE LIABLE FOR INDIRECT SPECIAL INCIDENTAL TORT ECONOMIC COVER OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF OR IN ABILITY TO USE LOGITEK PRODUCTS EQUIP MENT 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 DAM AGES 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 LIMITATIONS SHALL NOT APPLY TO CLAIMS RELATING TO DEATH OR PERSONAL IN JURY WHICH
10. le D1 amp D2 prevent damage to the regu lators if the supply rails are shorted together GAFETY WARNING Do NOT replace fuses without first disconnecting power to the console to avoid shock hazard ALWAYS use fuses of the same value as that specified in this manual Do NOT use slow blow types except where specified Do NOT use fuses of higher value than that specified Improper fuses may cause fire and shock hazard as well as damage to the equipment A blown fuse is most often though not always a symptom of another failure Therefore related cir cuitry should be examined carefully especially if a fuse blows more than once k k ck ck ck ck ck ck ck ck ck ck ck ck ck ck ck ck ck ck k k k kk OVUB amp 4VUB Meter Instruction Manual 3 4 Meter Circuits The inputto the far left hand meter meter 1 is con nected to a RF lowpass filter formed by R9 R10 C1 and C2 Theresistors also form a 9 dB pad with the in put impedance of balanced receiver IC1 1C1 provides an additional 6 dB pad between its input and output The pads allow 20 dBu input signals to be handled by the 5 volt supply rails When phase switch SW2 is in the inactive non indi cating position the output of IC1 is connected to me ter driver IC5b via DC stripper C10 and resistor R22 The 0 VU point of the meter may be set between 10 dBu and 10 dBu by adjusting the gain of IC5b via feedback resistor R1 The output of IC5b directly d
11. n materials or workmanship develops during the first two years following purchase when the equip mentis returned to the factory or LOGITEK authorized service centers freight prepaid with a description of the nature of the failure No reimbursements can be made for repair charges that are not factory autho rized After repair or replacement LOGITEK will re turn the equipment to the purchaser freight prepaid In the event that any part of this professional equip ment becomes defective during the first two years fol lowing purchase and purchaser wishes to attempt repair purchaser may obtain a replacement part by notifying LOGITEK of the part of the equipment which has failed LOGITEK will thereafter ship a replace ment part freight prepaid LOGITEK may require the purchaser to return the defective part to LOGITEK freight prepaid as a condition of such replacement ei ther before or after LOGITEK ships the replacement part LOGITEK shall not be responsible for any other charges or liabilities associated with pur chaser made repairs No part or equipment shall be considered defective if it fails to operate due to exposure to extreme temper atures or excessive moisture in the atmosphere Light bulbs batteries potentiometers or other equipment not manufactured by Seller shall carry only the warranty if any of the original equipment manu facturer in effect at the time of shipment of this order and Seller s obligation under this w
12. rives meter MTR1 In the same way a signal at J2 drives MTR2 via IC2 R21 SW2 and IC5a The output of IC2 is also phase inverted by IC6a When phase switch SW2 is inthe active indicating position MTR1 is fed the sum of input1 and via resistors R19 and R20 MTR2 is fed the sum of input1 and phase inverted input2 via resistors R17 and R18 If the in phase sum is larger than the out of phase sum then the inputs are in correct phase with each other Meters 3 and 4 on the 4VUB only are driven in the same way as meters 1 and 2 Page 6 SECTION 4 REPLACEMENT PARTS LIST All replacement parts are stocked in depth at the Logitek factory Most are also available through local electronic parts dis tributors 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 Components associated with meters 3 and 4 are not present on the 2VUB unit YMBOL 4 1 2VUB amp 4VUB Meter C1 8 C9 C10 13 C14 15 C16 17 D1 2 IC1 4 1 5 7 108 ICQ 7 pc J1 4 P5 10 P11 P12 6 pcs 1 pc F1 MTR1 4 4 pcs 4 pcs R1 4 R5 8 R9 16 R17 20 R21 22 R23 30 R31 32 RT1
13. the input pin on the XLR connector and connecting the shield from the source to the input pin If either the meter or the source unitis not grounded either by the third prong of its power cord or by a separate audio ground cable then an additional wire should be added to connect the input terminal on the meter to the nearest ground terminal Care should be taken to be sure that cable shields are connected to grounded equipment on only one end of the cable On any cable which connects two pieces of equipment of which both are grounded the cable shield must be left unconnected on one end or poor noise performance may result 2 7 ing O VU Level The 2VUB amp 4VUB units are factory adjusted so that a 0 dBu balanced input to a meter will be dis played as 0 VU on the meter dial If a different input level is used the meter 0 point may be set between 10 dBu and 10 dBu by adjusting the trim controls lo cated adjacent to each input connector 2 8 Ph Button A phase test button is provided for meters 1 amp 2 and another button is provided for meters 3 amp 4 on the 4VUB only The phase test mode is active when a col ored dot is visible in the cap of the push on push off button The phase test displays the sum of the two in puts on the left meter and the difference of the two in puts on the right meter If the sum level left meter is larger than the difference level right meter then the two inpu
14. the power cord All cor respondence to your Logitek representative or to the Logitek factory concerning your meter should include this serial number OVUB amp 4VUB Meter Instruction Manual 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 2VUB or 4VUB meter both during and after the 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 64 4470 By Fax 713 64 4479 By E mail help logitekaudio com By Mail Logitek Electronic Systems Inc 5622 Edgemoor Drive Houston Texas 77081 USA Page 4 SECTION 2 PREPARATION FOR USE 2 1 Initial Inspection Check the shipping carton carefully for external damage 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 damage immediately after unpacking Bent and broken parts dents and scratches should be noted If damage is found refer to paragraph 2 2 for recommended claim procedures Keep all packing material for possible future use 2 2 Claims 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
15. ts are probably phased correctly Page 5 SECTION 3 PRINCIPLES OF OPERATION 3 1 General Information WARNING Results will be greatly enhanced by making use of all available diagnostic information including the cir cuit descriptions in this section and direct help from Logitek technicians before attacking the circuitry with wire cutters soldering irons hammers or other tools of destruction X X ck X ck ck Ck ck Ck ck ck Ck ck Ck Ck ck Ck Ck Ck ck ck ck ck ck ck ko k ok Before attempting any repair or modification of the 2VUB or 4VUB the technician should become thor oughly familiar with the circuit in question by reading the technical description below and by studying the accompanying diagrams Engineers at the Logitek factory will be happy to discuss all aspects of the cir cuitry both during and after the warranty period 3 2 Access to Circuit Cards The meter circuitry can be accessed by removing the unit s top cover 3 3 Power Supply Power cord P12 is connected to the primaries of transformer T1 via a 1 4 amp slow blow fuse The pri maries are hooked in series for 220 volt operation or in parallel for 110 volt operation by switch SW1 The sec ondaries of T1 are hooked in a center tap ground con figuration to full wave bridge rectifier RT1 The output of RT1 is filtered by C14 amp C15 and regulated to 5Vdc by IC8 amp IC9 The supplies are stabilized by C16 C17 amp C9 whi
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