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© 2006 Wohler Technologies Inc. ALL rights reserved

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VMDA Series User Manual P/N 821115 Rev-C.5

VMDA-4 Block Diagram

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Summary of Contents for VMDA-1

Page 1: ...ngs Section 2 Technical Information ServiceandTroubleshootingGuide MainPCBCircuitDescription VMDA 1 and VMDA 4 Block Diagrams CONTENTS 1 2 3 4 5 7 8 12 15 16 16 18 VMDA Series VMDA 1 and VMDA 4 1U Monitor Speaker Unit with 1 or 4 AES EBU Digital Inputs 1 or 4 Analog Stereo Inputs Selected Analog Outputs Speaker Muting Headphone Output Phase Indication and Level Meters Document P N 821115 Rev D Use...

Page 2: ...plugs convenience receptacles and the point where they exit from the apparatus 11 Only use attachments accessories specified by the manufacturer 12 Use only with the cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus When a cart is used use caution when moving the cart apparatus combination to avoid injury from tip over 13 Unplug this apparatus during light...

Page 3: ... the four corners of the chassis ears This feature will reduce or eliminate rear bracing requirements in many mobile portable applications The weight of internal components is distributed fairly evenly around the unit Audio Connections Connection of the audio feeds is straightforward The system block diagram located on pages 20 and 21 may be referred to for clarification of the general signal path...

Page 4: ...ers that provide visual indication of input levels Fast and averaging phase LEDs gives visual alert of out of phase conditions and indicate whether the source is stereo or mono An auxilliary analog output of the selected analog or digital source is provided on the rear panel The VMDA series is completely magnetically shielded to allow interference free operation immediately adjacent to all CRT vid...

Page 5: ...han 0 2 Gauss any adjacent surface Balanced mini Phoenix 3 5mm Unbalanced BNC 1 75 x 19 x 9 0 in 44 5 x 483 x 246 mm 6 8 lbs 3 1kg UniversalACinput 100 240V UL CSAapproved GeneralSpecifications Applications Units are certified to meet at time of manufacture all currently applicable product safety and EMC requirements such as those of UL and CE 0 dbV ref 0 775V RMS Features and specifications subje...

Page 6: ... 2006 Wohler Technologies Inc ALL rights reserved 6 VMDA Series User Manual P N 821115 Rev C 5 Thispageleftintentionallyblank ...

Page 7: ... 2006 Wohler Technologies Inc ALL rights reserved 7 VMDA Series User Manual P N 821115 Rev C 5 Section 1 Operation Front Panel Controls and Indicators Rear Panel Connectors and Settings ...

Page 8: ...ed together and are reproduced simultaneously from the left and right speakers However when monitoring digital signals only one stereo pair at a time may be monitored An LED in each button lights up to indicate which channel s are selected for monitoring 5 Headphone Jack For critical listening or for listening in high noise environments use the headphone feature rather than the internal speakers S...

Page 9: ...HLER 2 3 6 5 0 1 3 7 10 20 5 2 3 1 POWER HOLD 1 SEC TO CHANGE A D 1 3 7 9 8 0 1 3 7 10 20 5 2 3 1 TAP TO MUTE BLINKS MUTE DIGITAL AVG O FAST OUT ANALOG FAST IN 1 VMDA 1 WOHLER 0 1 3 7 10 20 5 2 3 1 TECHNOLOGIES 3 4 2 1 VMDA 4 0 1 3 7 10 20 5 2 3 1 HOLD 1 SEC TO CHANGE A D TAP TO MUTE BLINKS MUTE DIGITAL POWER FAST OUT AVG O FAST IN ANALOG 4 6 5 3 2 7 3 8 1 1 1 9 VMDA 4 Front Panel ...

Page 10: ... or blinks green when signals are in phase The small bottom or out of phase LED FAST OUT glows or blinks amber for out of phase signals The large center LED AVG indicates the average phase condition by glowing green for in phase conditions or red for out of phase conditions In general it is sufficient to regard the center LED average phase condition as adequate for proper phase monitoring While it...

Page 11: ...OHLER 2 3 6 5 0 1 3 7 10 20 5 2 3 1 POWER HOLD 1 SEC TO CHANGE A D 1 3 7 9 8 0 1 3 7 10 20 5 2 3 1 TAP TO MUTE BLINKS MUTE DIGITAL AVG O FAST OUT ANALOG FAST IN 1 VMDA 1 WOHLER 0 1 3 7 10 20 5 2 3 1 TECHNOLOGIES 3 4 2 1 VMDA 4 0 1 3 7 10 20 5 2 3 1 HOLD 1 SEC TO CHANGE A D TAP TO MUTE BLINKS MUTE DIGITAL POWER FAST OUT AVG O FAST IN ANALOG 4 6 5 3 2 7 3 8 1 1 1 9 VMDA 4 Front Panel ...

Page 12: ...BNC connectors are configured as 75 Ohm unbalanced inputs VMDA 1 This panel mounted BNC connector receives standard AES EBU digital signals There is one input labeled AES 1 This BNC connector is configured as a 75 Ohm unbalanced input E Termination Settings for AES Inputs DIP Switch Modules These DIPswitches set the termination characteristics of theAES EBU inputs In the event that signals enterin...

Page 13: ...t Panel A B C E D F 100 240 VAC VMDA 1 50 60 Hz RIGHT HI LO 253582 LEFT ANALOG LO HI TERM AES 1 AES 1 RIGHT LO HI ANALOG INPUT LEFT A B E C D D C E D D F 100 240 VAC VMDA 4 50 60 Hz RIGHT HI LO 253589 LEFT ANALOG OUTPUT ANALOG INPUT LO AES 1 HI LO AES 3 HI AES 2 AES 1 TERM 1 AES 2 TERM 2 AES 4 LO HI HI HI LO LO AES 3 TERM 3 TERM 3 AES 4 TERM 4 TERM 4 1 2 3 RIGHT LO HI LEFT 4 ...

Page 14: ... 2006 Wohler Technologies Inc ALL rights reserved 14 VMDA Series User Manual P N 821115 Rev C 5 Thispageleftintentionallyblank ...

Page 15: ...Wohler Technologies Inc ALL rights reserved 15 VMDA Series User Manual P N 821115 Rev C 5 Section 2 Technical Information Service and Toubleshooting Guide Audio Circuit Description Interconnect Block Diagram ...

Page 16: ...llinelevel selectthat signalformonitoring thenadjustthetrimpotP2andP3untilthebalancedanalogoutputisatthesamelevelasthebalanced analoginput ThenadjustthetrimpotsP6andP7sothatthefrontpanelbargraphmetersreadzerolevel The Controller IC15 PIC16C74B isan8 bitCMOSmicro controllerwithanonchipA Dconverter Thischipcontrolsnearlyall thefunctionsoftheVMDAunit 1 IC15 reads the position of the volume and balanc...

Page 17: ...connectors J8andJ11 TheBNC saccept75ohm unbalanceddigitalaudio Themini terminalblockconnectorsaccept110ohmbalanceddigitalaudio The110 ohm balanced digital audio signal is converted to 75 ohm unbalanced digital audio signals by the transformers T1 T2 T3 and T4 These digital audio signals can be terminated by the user by closing the appropriate section the DIP switches S1 and S2 IC15 controls which ...

Page 18: ... 2006 Wohler Technologies Inc ALL rights reserved 18 VMDA Series User Manual P N 821115 Rev C 5 VMDA 1 Block Diagram ...

Page 19: ... 2006 Wohler Technologies Inc ALL rights reserved 19 VMDA Series User Manual P N 821115 Rev C 5 VMDA 4 Block Diagram ...

Page 20: ...HuntwoodAvenue Hayward CA 94544 Phone 510 589 5676 Fax 510 870 0811 US Toll Free 1 888 596 4537 web www wohler com e mail support wohler com You can now contact us at Wohler Technologies Inc 31055 Huntwood Avenue Hayward CA 94544 Phone 510 870 0810 Fax 510 870 0811 US Toll Free 1 888 596 4537 www wohler com support wohler com ...

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