Friday, June 8, 2018

Niles ZR 4630 tear down and rebuild

A friend has a Niles ZR-4630 that he wants made into independent amplifiers.  There are six stereo amplifiers based on the LM3886 IC.  I have been reverse engineering it.  By default the mute is "on" for the amplifier modules.  Here are some pictures of the guts.
This shows the amplifier modules and the power transformer.  We could not get the power on by the on off switch so we hot wired power to the transformer.
This is another view of the transformer and amplifiers.
This is a view of the back side of the guts.
So far I have been able to confirm the pins of the amplifiers. There is more to come.
Here is a picture of one of the amplifiers running on the workbench.

7 comments:

balarc said...

Hello. Please VCC? Amp? Thanks

balarc said...

Hello. VCC? Amp? thanks

Bob Davis said...

The power transformer has six windings that are 42 VCT each.

Joel said...

I have a single one of these boards. What kind of transformer do I need? And how do you unmute it? It will drive 4ohm speakers.

Bob Davis said...

You need a transformer with 40 to 42 VCT to power it up. The mute is turned off with a resistor to 5 volts.

balarc said...

Thanks

balarc said...

Thanks