AML ez1081pre Assembly Manual Download

Page: 39 / 43

AGnd

-16v DC
Pin 14

+16v DC
Pin 12

Analogue Ground
Pin 5

PSU Common
Pin 13

Chassis Ground
Pin 1

AGnd

BA338 Pin 6

BA340 Pin 6

Surge Control Sub Assembly

Date

File

Drawn by

Rev

Title

Number

Audio Maintenance Limited

E-Mail: [email protected]

C Adshead

ez1081-500 (Power)

AML-07-119

Sheet

4 of 4

8th Aug. 2017

AML-07-119 - rev 2

VFloatNeg

*R65 = 10R if surge control omitted
R65 = 150R if surge control fitted

TP6

TP7

Summary of Contents for ez1081pre

Page 1: ...ez1081pre Mic Amplifier Assembly manual Colourbook Issue 1...

Page 2: ...ez1081pre Colourbook Contents Section 1 Colourbook assembly guide Section 2 Setup and Calibration Section 3 Schematics diagrams and PCB Overlays Section 4 Parts List...

Page 3: ...Revision 1 initial release ez1081pre Colourbook revision history...

Page 4: ...nap apart the 5 PCB s into individual boards and trim or file off any excess tabs PCB Preparation Switch PCB Input Transformer PCB 1 Input Transformer PCB 2 Heatsink Insulator PCB Not used on PCB Rev...

Page 5: ...D2 D3 D7 D8 1N4148 4 D5 D9 D10 D11 1N4007 4 D4 D6 BAT46 2 Diodes...

Page 6: ...R61 1R0 1 R59 R60 1R5 2 R62 2R2 1 R50 R58 10R 2 Resistors...

Page 7: ...R33 47R 1 R7 82R 1 R6 R24 100R 2 R10 R35 R53 R65 150R 4 Resistors...

Page 8: ...R11 300R 1 R46 R49 R54 470R 3 R63 750R 1 R12 R34 R37 R39 R41 R52 R55 560R 7 Resistors...

Page 9: ...R8 1k1 1 R1 1k2 1 R2 R3 1k5 2 R13 1k3 1 Resistors...

Page 10: ...R9 2k0 1 R38 R42 2k2 2 R17 2k4 1 Resistors R22 R29 2K7 2...

Page 11: ...R44 3k9 1 R16 4k3 1 R26 5k1 1 R15 R21 R23 7k5 3 Resistors...

Page 12: ...R25 R40 R47 R57 R64 10k 5 R18 12k 1 R14 13k 1 R43 R45 15k 2 Resistors...

Page 13: ...R32 18k 1 R19 22k 1 R30 36k 1 Resistors...

Page 14: ...R20 R27 R31 R36 R56 47k 5 R48 56k 1 Resistors R4 R5 6k81 0 1 2...

Page 15: ...C8 C29 47pF 2 C27 68pF 1 Ceramic Capacitors C7 C13 100pF 2...

Page 16: ...C16 C30 C31 220pF 3 CL1 CL2 100pF 3 Terminal L C Network 2 C23 C28 100nF 2 F1 F2 Ferrite Bead 2 Ceramic Capacitors...

Page 17: ...C15 470pF 1 C1 1n2F 1 Film Capacitors C32 4n7F 1...

Page 18: ...C14 C21 10nF 2 C25 100nF 1 Film Capacitors and Relay C26 330nF 1 RL1 24 Volt DPCO relay 1...

Page 19: ...Electrolytic Capacitors All positive terminals towards left C2 C9 10uF 50v 2 C3 C10 C19 22uF 63v 3 C11 C12 C17 220uF 25v 3...

Page 20: ...ZTX690B 1 Trimmers Molex and Small Signal Transistor flat side towards the Lower edge of the PCB Flat Side R28 R51 5k0 2 Top adjust style ZTX690B Molex KK Series 8 way 1 Tab towards output transforme...

Page 21: ...Small Signal Transistors flat side towards the Left Hand edge of the PCB Q2 Q3 Q6 Q7 Q10 Q12 BC550C 6 Q1 Q8 Q11 BC560C 3...

Page 22: ...th it s rear side facing towards the top of the PCB BD140 BD139 BD140 Q5 BD139 1 Q4 BD140 1 BD139 Front View Rear View Install the BD140 with it s rear side facing towards the bottom of the PCB Rear t...

Page 23: ...Cut off excess pin and solder Long pin goes through PCB Fit pin headers to switch PCB 1 x 10 way 1 x 8 way 10 way 8 way...

Page 24: ...n on 3 Important The toggle switches are surprisingly sensitive to heat solder one pin on each switch and then allow to cool before continuing Make sure that the toggle switches are seated perfectly s...

Page 25: ...Voltage Regulator U1 7808 voltage regulator 1 M3x12 screw M3 Nylon Washer PCB M3 Nyloc nut Insulating bush Insulating washer sheet...

Page 26: ...Large Electrolytic Capacitors All positive terminals towards left C6 C22 C24 470uF 35v 3 C4 C5 C18 C20 1000uF 35v 4...

Page 27: ...the right side of the heatsink in position Q14 with their rear sides towards the heatsink and a TO220 insulator behind each device Secure in place with an M3 x 12mm screw and Nyloc nut Trim transistor...

Page 28: ...s do not discard Fit the assembly into the main PCB and then tighten up the screws but not too tightly Remove the assembly again and then solder the transformer to its PCB On the end of the transforme...

Page 29: ...Switch PCB Fitting Insert switch PCB into main PCB ensuring that it is perpendicular and solder in place 90...

Page 30: ...self adhesive silver washer over the pin holes to stop the pin coming out Make sure the spindle is in the position shown before fitting pins 0 clicks up from factory setting Keep the nut discard the s...

Page 31: ...tion Fit the 48v indicator LED to the solder side of the PCB such that the base of the LED aligns with the front edge of the PCB Flat of LED Solder Side Long Leg gn front edge of LED base with edge of...

Page 32: ...Chassis Assembly 2 x M3 Nyloc nut Install PCB onto chassis Secure PCB to chassis with 5 x M3x8 Sems screws Secure faceplate to chassis with 2 x M3 Nyloc Nuts 1 2 3 4...

Page 33: ...switch knob Install the nut for the rotary switch The shakeproof washer is not required Rotate the switch shaft fully counter clockwise Install the knob in the 15dB position Tighten using a 1 16 inch...

Page 34: ...ghten the screws Ideally apply some LocTite thread adhesive to the screws if available M3 x 28mm screw M3 shakeproof washer Plug the output transformer molex connector into molex on the PCB MAKE SURE...

Page 35: ...ltage between bias test points TP6 TP7 It should typically measure about 50 60 mV 3 Apply a signal of 40dBu to the input and then turn gain control up to 60dB 4 Measure the output signal and adjust ga...

Page 36: ...utput Hi Pin 2 Output Lo Pin 4 Chassis Ground VTB2568 Phase Switch PCB Main PCB Switch PCB Main PCB Violet Blue Sub Violet Sub Blue Post Phase Hot Post Phase Cold Sub Post Phase Hot Sub Post Phase Col...

Page 37: ...ate File Drawn by Rev Title Number Audio Maintenance Limited E Mail service audiomaintenance com C Adshead BA340 Output Amp ez1081 500 Amplifiers AML 07 119 Sheet 2 of 4 8th Aug 2017 AML 07 119 rev 2...

Page 38: ...5dB 20dB 25dB 30dB 35dB 40dB 45dB 50dB 55dB 60dB 65dB 70dB AGnd Mic Gain Signal In Mic Gain Signal Out 15dB 20dB 25dB 30dB 35dB 40dB 45dB 50dB 55dB 60dB 65dB 70dB 15dB 20dB 25dB 30dB 35dB 40dB 45dB 50...

Page 39: ...n 6 BA340 Pin 6 Surge Control Sub Assembly Date File Drawn by Rev Title Number Audio Maintenance Limited E Mail service audiomaintenance com C Adshead ez1081 500 Power AML 07 119 Sheet 4 of 4 8th Aug...

Page 40: ...ev 2 ez1081 500 preamp 2 3 4 5 6 7 8 9 10 11 VTB2568 VTB9045 LoZ 48v O P Phase Transformer fitted on this side This side up Gain Trim Bias Trim Bias Test Yellow Black Orange Blue Green Red Violet Brow...

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Page 43: ...stor 0 25W 1K1 R8 Resistor 0 25W 2k0 R9 Resistor 0 25W 150R R10 R35 R53 Resistor 0 25W 300R R11 Resistor 0 25W 560R R12 R34 R37 R39 R41 R52 R55 Resistor 0 25W 1k3 R13 Resistor 0 25W 13k R14 Resistor 0...

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