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AML ezMEQ-500 Assembly Manual

Passive midrange equalizer
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ezMEQ-500 Passive Midrange Equalizer - Assembly manual
["Colourbook" Issue 2]

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Summary of Contents for AML ezMEQ-500

  • Page 1 Passive Midrange Equalizer - Assembly manual [“Colourbook” Issue 2]...
  • Page 2 ezMEQ5-500 “Colourbook” Contents. Section 1 - “Colourbook” assembly guide Section 2 - Schematics diagrams and PCB Overlays Section 3 - Parts List...
  • Page 3 ezMEQ5-500 “Colourbook” revision history Revisions 1 to 1a; Updated for Rev 3 PCB Revisions 1a to 2; Updated for Rev 4 PCB...
  • Page 4 PCB Preparation LF Switch PCB Carefully snap apart the 7 PCB’s into individual boards and trim or file off any excess tabs. Inductor PCB Dip Switch PCB Spacer PCB’s HF Switch PCB Main PCB...
  • Page 5 Diodes D1, D2 & D3 = 1N4007...
  • Page 6 Resistors R28 = 10R R27 = 12R R10 & R24 = 75R R43 = 270R...
  • Page 7 Resistors R15 & R18 = 470R R38 = 510R R6 & R14 = 620R R39 = 1k0...
  • Page 8 Resistors R11 = 1k2 R13 = 1k5 R9 = 2k2 R36 & R41 = 3k0...
  • Page 9 Resistors R19 = 3k3 R33 = 5k6 R35 = 7k5 R7, R16 & R30 = 10k...
  • Page 10 Resistors R8 & R25 = 18k R32 = 22k R3, R4 & R5 = 33k R17 & R20 = 56k...
  • Page 11 Resistors R29 = 100k R23 = OMITTED R12 = 120k R37 = 180k R40 = 220k R31 = 1M0...

  • Page 12: Ceramic Capacitors

    Ceramic C3 = OMITTED C50 = 47pF Capacitors C9, C48 & C49 = 220pF C12 = 330pF C17 = 100nF...

  • Page 13: Emc Filters

    EMC Filters F1 & F2 = Ferrite Bead CL 1 & CL2 = 100pF C/L Network...
  • Page 14 Film C7 = 470pF Capacitors C43 & C46 = 2n2F C41 = 3n3F C10 & C42 = 4n7F...
  • Page 15 Film C13 & C44 = 10nF Capacitors C29, C30, C32 & C45 = 15nF C21, C23, C38 & C47 = 33nF C27 = 47nF...
  • Page 16 Film C26 = 82nF Capacitors C34 & C35 = 100nF C22, C25 & C36 = 150nF C19 & C33 = 220nF...
  • Page 17 Film C39 = 330nF (1) - [C39 Mounted on rear] Capacitors C31 = 470nF C28 & C40 = 680nF (2) - [C40 Mounted on rear] C24 & C37 = 1uF (2) - [C37 Mounted on rear] C20 = 1u5F...
  • Page 18 C1, C5 & C6 = 10uF / 50v Small Capacitors Positive terminals towards left C14 = 22uF / 63v Positive terminals towards left C16 & C18 = 100uF / 25v Positive terminals towards left...
  • Page 19 C11 = 100uF / 63v Small Capacitors Positive terminals towards left and Transistors C15 = 220uF / 10v Positive terminals towards left Q1, Q2, Q3 & Q4 = BC550C Q6 & Q7 = BC560C...
  • Page 20 Trimmers and Relay RL1 = 24 Volt DPCO relay R21 & R42 = 500R Top Adjust Trimmer R22 = 5k Top Adjust Trimmer...
  • Page 21 Connectors and J1 = 10 Way Box Header *** Note orientation**** M3 Screw points Molex KK Series - 8 way Tab towards output transformer M3 “Toby Fix” PCB screw fittings ***Note orientation***...
  • Page 22 Large Capacitors C2, C4 & C8 = 470uF / 35v Positive terminals towards left...
  • Page 23 Switches SW3 = GR-03-001 (1) - 12 position, 1 pole, 3 gang SW4 & SW5 = GR-03-003 (1) - 6 position, 2 pole, 1 gang * * Alternative type may be supplied GR-03-013 (1) - 6 position, 2 pole, 2 gang SW2 = Toggle Switch DPDT (on-on) [Horizontal - sub-min CK-03-006] Mounted in the front positions...
  • Page 24 Inductors Blue Violet Green IN1 = Inductor VTA1445 Yellow Orange Brown Brown ***** NOTE ORIENTATION ***** Orange IN2 = Inductor VTA1443 Yellow Green ***** Must match wire colours written on PCB ***** IN3 = Inductor VTA1442 Orange Brown Orange Brown Blue Violet Green...
  • Page 25 Input and Interstage Transformers NOTE ORIENTATION !!!! T1 = AML-18-004 Make certain that the pin numbers on the bottom of the transformer coincide with the numbers written on the PCB... These 2 transformers are different ways round from each other.
  • Page 26 Heatsink HS1 = 63mm Heatsink (1) - SK129 type (63mm long) Using a large soldering iron tip, solder to the PCB. Check Vertical Tack in place first then check they are vertical before Solder fully soldering completely. Tack in place. Orange Brown Blue...
  • Page 27 Output Transistor Q5 = TIP3055 Transistor R26 = 47R 5W Resistor TIP3055 + TO247 insulator and Power Resistor (bush not required) TIP3055 TO247 Insulator M3 x 10mm Front Install the TIP3055 on the lower side of the View heatsink in position Q5 (with its rear side Nyloc.

  • Page 28: Ribbon Cable

    Ribbon Cable Pin 1 Marker J3 = 10 Way Ribbon Cable 60 mm Pin 1 Marker Orange Brown Blue Violet Green Yellow Orange Brown...
  • Page 29 Output Transformer Assembly and Fitting Assembly Tip: It is usually easier to plug in T2 = VTB2569 (1) the molex connector before screwing the transformer in place Plug the output transformer molex connector into molex on the PCB Screw the output transformer to the PCB using 4 x M3 x 30mm screws and 4 x M3 x 4mm spacers and 4 x M3 Nyloc Nuts.
  • Page 30 Power LED installation (Fitted on underside of PCB) Fit the power indicator LED to the solder side of the PCB such that the base of the LED aligns with the front edge of the PCB. Long Leg “Flat” of LED BACK OF PCB Align rear edge of LED base...
  • Page 31 Potentiometers R1 = OM-01-100 (1) - 10k Linear 20mm R2 = OM-01-097 (1) - 2k2 Linear 20mm + bracket R34 = OM-01-102 (1) - 2k2 Rev Log 20mm Orange Brown Brown Blue Violet Violet Green Green Yellow Blue Orange Orange Black Yellow Brown...
  • Page 32 Fit pin headers to Inductor PCB PL2 & PL4 = 6 Pin Straight Header (1 X 6 PIN ROWS) Orange Brown Blue Violet Green Yellow Orange Brown...
  • Page 33 Rotary Switch Adjustment Pins Fit pins in positions shown then apply the self adhesive silver washers over the pin holes to stop the pins coming out. **** Make sure the spindles are in the position shown before fitting pins **** [Just in case they have been accidentally rotated during switch fitting] LF Freq pins at...
  • Page 34 Fit pin headers to HF and LF Switch PCBs PL 7 & PL8 = 8 Pin Right Angle header (2 X 4 PIN ROWS) PL7 - Straight pins goes through PCB PL8 - Straight pins goes through PCB...
  • Page 35 Fit HF and LF PCBs to underside of Inductor PCB Assembly Tip: Use the faceplate to help align the switch PCBs before soldering all the pins.
  • Page 36 Fit DIP PCB to top side of Inductor PCB Assembly Tip: (using 4mm spacer PCBs) Use the faceplate to help align the switch PCBs before soldering all the pins. Use the 4mm spacer tool PCBs to set the height of the DIP PCB above the Inductor PCB.
  • Page 37 Assembling PCB’s together 1] Using M3x8mm SEMS screws, attach the M3 x 35mm spacers to the main (lower) PCB. 2] Using M3 Nyloc Nuts, secure the switch (upper) PCB. 2] Plug in the 10 way ribbon cable. Orange Brown Brown Brown Blue Violet...

  • Page 38: Chassis Assembly

    Chassis Assembly 1] Remove the protective plastic coating from the chassis (if fitted). 2] Secure faceplate to chassis with 2 x M3 Nyloc Nuts 2 x M3 Nyloc nut Place a pot washer on each pot and replace the washer on Secure PCB assembly to chassis with 5 x M3x8mm Sems screws each rotary switch before fitting into the chassis.
  • Page 39 ATTEN SEL HF ATTEN HF ATTEN HIGH HIGH FREQUENCY FREQUENCY HF BOOST HF BOOST BANDWIDTH BANDWIDTH Rotate the shafts fully counter-clockwise... LF ATTEN LF ATTEN SHARP BROAD SHARP BROAD 20 30 20 30 LF BOOST LF BOOST FREQUENCY FREQUENCY AML-UK AML-UK...
  • Page 40 1] Remove the protective plastic coating from the lid if fitted. 2] Place the lid over and secure with 4 x M3x4mm button head screws (using 2mm allen key)
  • Page 41 ezMEQ5-500 Calibration / Setup 1 ] Before powering up the module, turn the “Bias Adjust” trimmer R22 fully clockwise (about 10 turns) 2 ] Power up module, measure the DC voltage across resistor R27 [It should typically measure about 300-400 mV (after relay clicks)] {If using a bench power supply, the current draw will be about 40-50mA} 3 ] Slowly turn the “Bias Adjust”...
  • Page 42 Filter Output Passive Filter Input Lo V Ref Negative V Ref Negative Audio Maintenance Limited E-Mail: service@audiomaintenance.com Chassis Ground Title AML ezMEQ5 - 500 (Gain Stage) Number AML-07-121 20th Apr 2021 Date Drawn by C Adshead File AML-07-121 - rev4 Sheet...
  • Page 43 Passive In Hot Mid "DIP" v Ref Negative DIP Freq Select Sub Card "Dip" board Audio Maintenance Limited E-Mail: service@audiomaintenance.com Title AML ezMEQ5 - 500 (Filter) Number AML-07-121 Date 20th Apr 2021 Drawn by C Adshead Switch gang C not used...
  • Page 44 SUB DIP Freq Select - 277mH DIP Freq Select - 277mH Filter Card Agnd SUB DIP Freq Select - Agnd AML ezMEQ5 - 500 (Power & Conn) SUB DIP Freq Select - 145mH DIP Freq Select - 145mH Filter Card Agnd...
  • Page 45 LF Freq Mounted on rear Mounted on rear Mounted on rear DIP Freq HF Freq...
  • Page 48 Sunday, April 25, 2021 Written: Project Path: C:\aml\PCB Designs\AML-07-121 - Rev 4 - AML ezMEQ5-500\AML-07-121 - Rev 4 - AML ezMEQ5-500 - panelled\AML-07-121 - Rev 4 - AML ezMEQ5 - 500 - panelled.prj Design Path: C:\aml\PCB Designs\AML-07-121 - Rev 4 - AML ezMEQ5-500\AML-07-121 - Rev 4 - AML ezMEQ5-500 - panelled\AML-07-121 - Rev 4 - AML ezMEQ5 - 500 - panelled.pcb...
  • Page 49 Component Value Names Quantity Cost Header - 10 Way 0.00 Edge Connector - API 500 0.00 Header - 10 Way Transition 0.00 Connection - Schematic Only J4-89, J93-115 0.00 Connection - Schem Interconn J116-139 0.00 Jumper - 8 Pin DIL PL1, PL3, PL7-8 0.00 Jumper - 6 Pin SIL...
  • Page 50 Heatsink - TO220 0.00 Inductor - VTA1442 0.00 Inductor - VTA1445 0.00 Inductor - VTA1443 0.00 LED1 0.00 Relay 2 Pole Changeover 0.00 Connection - M3 Fixing Point SC1-15 0.00 Solder Switch 0.00 Switch - C&K SubMin DPDT on-on 0.00 Switch - Grayhill 71 12W1P3G 0.00 Switch - Grayhill 71- 6W2P2GP...