Difference between revisions of "EPower"

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m (Enterprise mainboard preparation)
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* R15 (1.5 kΩ)
 
* R15 (1.5 kΩ)
 
* R16 (3.9 kΩ)
 
* R16 (3.9 kΩ)
|[[File:desoldering.png|250px]]<br><center>Desoldered components</center>
+
|&nbsp;&nbsp;&nbsp;[[File:desoldering.png|250px]]<br><center>Desoldered components</center>
|[[File:removed.jpg|250px]]<br><center>Remove these components</center>
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|&nbsp;&nbsp;&nbsp;[[File:removed.jpg|250px]]<br><center>Remove these components</center>
|[[File:EPprepared.jpg|250px]]<br><center>Prepared mainboard</center>
+
|&nbsp;&nbsp;&nbsp;[[File:EPprepared.jpg|250px]]<br><center>Prepared mainboard</center>
 
|}
 
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Revision as of 18:46, 15 May 2018

EPower module (top view)
EPower module (bottom view)

Brief information

The EPower module replaces the original Enterprise power circuits.

Specification

The module has three power sources:

  • 12 V @ 0.7 A,
  • 5 V @ 1.5 A channel A,
  • 5 V @ 1.5 A channel B.

The current limitation of the 5 V stabilizer is set at 3.7 A [I = 37125 / R1] (the maximum possible current is 7 A, if need, but it could damage the circuitry of the computer).

Maximum values (limited by permissible current of the power filters) are:

  • 12 V @ 1.2 A,
  • 5 V @ 2.5 A per channel (both 5A+5B @ 4.5[A]).

This is much more than the original power source (12[V] @ 0.15[A] and 2x 5[V] @ 1[A]).

How to install

The author has made every effort to make the module as reliable and safe to use as possible. However,

You make any modifications inside of your equipment at your own risk !

What you need

  • EPower module
  • screwdriver
  • soldering iron
  • tin extractor
  • solder tin
  • pliers

Enterprise mainboard preparation

The following components should be desoldered from the motherboard:

  • C8 (100 µF)
  • C9 (100 µF)
  • C10 (100 µF)
  • C11 (100 µF)
  • C12 (100 µF)
  • D2 (1N4001)
  • D3 (1N4001)
  • D4 (1N4001)
  • L1 (coil)
  • U19 (LM7805)
  • U20 (LM7805)
  • U21 (LM78L12)
  • TR2 (BC337)
  • TR3 (BC212)
  • R13 (100 Ω)
  • R14 (10 Ω)
  • R15 (1.5 kΩ)
  • R16 (3.9 kΩ)
   Desoldering.png
Desoldered components
   Removed.jpg
Remove these components
   EPprepared.jpg
Prepared mainboard

Installing the module

The module pins are matched to holes after the components:

  • D2 (both holes),
  • TR3 (ground),
  • C8 (+9V),
  • U21 (output +12V).

The holes in which the module is installed should be very carefully cleaned of tin residues.
Especially the holes after the transistor TR3 and the U21 chip due to their smaller diameter.
Do not force the pins. Despite careful assembly, it is possible to slightly tilt the pins from the vertical.
They should be corrected if necessary.
The position of the pins is very precisely matched and the module should be allow gently slide into place.
When soldering, make sure that the module adheres to the main board (up to the height of pin spacers).
After assembly, cut out the excess of tips with a pair of pliers.

The main stabilizer is intentionally undercut to allow the existing heat sink to be screwed.

   EPower fitting.jpg
Module fitting
   EPower pins.jpg
Cut the excess of pins
   EPower inside.jpg
Installed EPower module

Links

Thread on the Enterprise Forever forum Enterprise Power module - EPower