MNATS 1176LN (Rev J PCB) Clone Module Assembly

The assembly of this module is fairly straightforward provided you know what variant/options you are constucting. The PCB caters for a number of different parts and configurations so it's essential that you decide your configuration and purchase the components required for it.

Here's a scan of the PCB overlay with all the extraneous silkscreen greyed out. This makes a very useful part of the service manual in order to locate components since once they are installed, you can't see the designators. It also helps during assembly since only the required components are shown.

Masked 1176LN Overlay. 

 

PCB blank

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If you are using the on-board power supply, build that section first and check the supply output rail voltages to confirm that they are correct. There's only a small handful of components associated with this section so it should be fairly easy to build and test.

Now construct the rest of the module. Start off with the resistors. It pays to double check each one prior to insertion and soldering to save headaches locating it after something doesn't work.

Add the caps, trimmers, diodes and transistors, making sure that they are inserted the correct way around and in the correct holes. C16 is not necessary as it appears to be a compensation cap for op-amps that require it. The LF351/TL071 op-amps do not require this.

Double check the FET orientation. I've marked the g/s/d terminals on the PCB overlay as a reference. The 2N5457 devices are oriented backwards (ie the flat side of the package faces the curved overlay marking). The data sheet for the 2N5457 device is on the FET page as a reference.

Add the op-amps, in sockets if preferred for easier servicing, and finally the transformer.

Here's a picture of the module with the components added, ready for installation and wiring in the enclosure.

 

1176 module