AML ez1081pre Assembly Manual Download Page 43

IC Component; 
7808    U1 
 
Capacitors;  
Cap Wima 0.2 Pitch (0.3 x 0.1)  

1n2  

 

 

C1  

Cap Pol 0.08 (5mm Daimeter)  

10uF/50v  

 

C2, C9  

Cap Pol 0.1 (6.3mm Daimeter)  

22uF/63v  

 

C3, C10, C19  

Cap Pol 0.2 (12.5mm Daimeter)  

1000uF/25v    

C4-5, C18, C20  

Cap Pol 0.2 (10mm Daimeter)  

470uF/35v  

 

C6, C22, C24   

Cap Plate 0.1 Pitch    

 

100pF   

 

C7, C13  

Cap Plate 0.1 Pitch    

 

47pF    

 

C8, C29   

Cap Pol 0.15 (8mm Daimeter)  

220uF/25V  

 

C11-12, C17    

Cap Wima 0.2 Pitch (0.3 x 0.1)  

10nF    

 

C14, C21    

Cap Wima 0.2 Pitch (0.3 x 0.2)  

470pF   

 

C15    

Cap Plate 0.1 Pitch    

 

220pF   

 

C16, C30-31    

Cap Plate 0.1 Pitch    

 

100nF   

 

C23, C28    

Cap Wima 0.2 Pitch (0.3 x 0.1)  

100n    

 

C25   

Cap Wima 0.2 Pitch(0.3 x 0.15)  

0u33    

 

C26    

Cap Plate 0.1 Pitch    

 

68pF    

 

C27    

Cap Wima 0.2 Pitch (0.3 x 0.1)  

4n7  

 

 

C32    

 
Diodes;   
LED - L144      

D1   

1N4148    

 

D2-4, D6-8   

1N4001    

 

D5, D9-11    

 
Connectors;   
Jumper - 10 Pin SIL    PL1, PL4-6    
Jumper - 8 Pin SIL     PL2-3, PL7-8    
 
Resistors;   
Resistor 0.25W  

1k2  

 

R1    

Resistor 0.25W  

1K5    

R2-3    

Resistor 0.25W  

6k8 0.1%  

R4-5    

Resistor 0.25W  

100R    

R6, R24    

Resistor 0.25W  

82R    

R7    

Resistor 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 0.25W  

7K5    

R15, R21, R23    

Resistor 0.25W  

4k3  

 

R16    

Resistor 0.25W  

2k4  

 

R17    

Resistor 0.25W  

12K    

R18    

Resistor 0.25W  

22K    

R19    

Resistor 0.25W  

47K    

R20, R27, R31, R36, R56    

Resistor 0.25W  

2K7    

R22, R29   

Resistor 0.25W  

10k  

 

R25, R40, R47, R57, R64    

Resistor 0.25W  

5K1    

R26    

Trimmer - Vert - dual layout 5K  

R28, R51    

Resistor 0.25W  

36K    

R30    

Resistor 0.25W  

18K    

R32    

Resistor 0.25W  

47R    

R33    

Resistor 0.25W  

2k2  

 

R38, R42    

Resistor 0.25W  

15K    

R43, R45    

Resistor 0.25W  

3K9    

R44    

Resistor 0.25W  

470R    

R46, R49, R54    

Resistor 0.25W  

56k  

 

R48    

Resistor 0.25W  

10R    

R50, R58    

Resistor 0.25W  

1R5    

R59-60    

Resistor 0.25W  

1R0    

R61    

Resistor 0.25W  

2R2    

R62    

Resistor 0.25W  

750R    

R63    

Resistor 0.25W  

150R   

R65    

 
Transistors; 
   
BC560C    

Q1, Q8, Q11    

BC550C    

Q2-3, Q6-7, Q10, Q12    

BD140    

Q4, Q14    

BD139    

Q5, Q13   

ZTX690    

Q9    

 
Others;   
EMI Filter - Murata 1K  

 

CL1-2    

Ferrite Bead     

 

 

F1-2    

Heatsink - TO220      

 

HS1    

Relay 2 Pole Changeover      

RL1  

Switch - Grayhill 71 12W1P3G    

SW1    

Switch - C&K DPDT on-on     

SW2-4    

Transformer - VTB9045   

 

T1   

Transformer - VTB2568    

 

T2   

 

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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