Amplifone Reproduction High Voltage Board Assembly Guide  By Dezbaz

 Created 14-April-2019

1. For PCBs purchased from Amazing Arcading

2. Purchase other gear needed to complete the Project

Of course you can reuse your original heatsink if you are replacing your faulty or burnt board

No need to paint the heatsink. Paint will hinder heat transfer

Attach the Heatsink to the PCB using 2 x 4mm alum rivets, 1/4" long will do

Now is time to fit the Pos (VR1) and Neg (VR2) Regulators to the heatsink and PCB, then the 2 x TO-220 Resistors R20 and R21

Use good quality regulators as the cheap ones fail quickly and cause grief and often take out other parts on the way

Use flat and round insulators on both regs. The original board only used one. This causes confusion, so use them to avoid confusion

Use a light smear of heat paste as they get hot. No need for insulators if your resistor has plastic mounting (No metal etc)

Test there is no continuity between all pins and the metal of the heat sink

Next assemble all the resistors, zener diodes, diodes, capacitors, transistors, connectors and wiring

Do the small heat sink transistor last (Q3) If using the small heat sink no need to use a flat insulator. The collector provides electrical continuity to the PCB

The original board actually had the middle pin cut off allowing the metal to complete the circuit to the PCB

A second option for Q3 exists now on the latest revision of the HV board. The right hand side of the board there is a new mounting position for Q3 on the main heat sink

If using this new position, you must use the flat and round insulators, and heat paste

Please ensure zener diodes are correct polarity, and are in fact, zener diodes

Regular diodes polarity is important

Look at the ID on every Diode. Use a magnifier to get it right

Electrolytic caps are also polarity sensitive. The board is marked +, the cap is only marked -. That means you are actually matching in an opposite fashion.

So align the neg of the capacitor to hole in the board opposite to the positive etc

Transistors: Get them right, bend the leads so they fit in the same alignment as the picture ID on the board

Do the PNP ones first , then do the NPN.

Look at the ID on every Transistor. Use a magnifier to get it right

The focus block can be obtained from a WG6100 Flyback transformer. You can use an original if just replacing the xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

The harness

Harness wires connect directly to the PCBconnectors for your board harness, or solder directly like the original

The removable harness was a convenience thing for the early days. So guys could order from an experienced harness maker. That option is long past in 2019. Maybe ask for another run if reading this after 2019

Need to ask for more info? email us