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PC Board Connections
+12VDC to [V+]
DC Gnd to [GND]
And, add a jumper between [V+] and [SQ]
Modification Steps:
NOTE: This is what I call the 'clean' mod. The quick 'n dirty mod is on
the following page. This mod is probably most applicable if the cable
on your speaker has been cut short.
NOTE: This amplified speaker (NSN6027A) uses a PC board with the
ID# 84D05644D01 etched into the copper. This model utilizes
external output transistors which are physically attached to the PCB
mounting frame. If your PC board HAS this ID number but DOES
NOT HAVE external output transistors, refer to the page of this
document which references model NSN0648A and PC board ID
#84D05644D01.
1) Remove the speaker case and remove the screws holding the PC
board to the internal frame.
2) All control cable wires are installed in a semi-circle around a cutout in the PC board. Also note that, on the
COMPONENT side of the PC board, several of the holes are labeled, for easy identification later. This will be
important in future steps. CONFIRM that the component-side labels MATCH those labels which have been added to
the PC board drawing shown above. NOTE that although the pad at the bottom of the semi-circle is NOT labeled, it is
actually the ground (GND) pad for the circuit.
3) CAREFULLY desolder and remove ALL (7) wires from the pads around the semi-circular cut-out on the PC board.
4) On the component side of the PC board, install new +12VDC DC power leads, connecting to holes [GND] and [V+].
5) On the component side of the PC board, install a shielded AF input lead (RG-174 works nicely), connecting shield to
[GND] and center conductor to [IN].
6) On the non-component side of the PC board, install an insulated jumper between [RET] and [GND]. There may be NO
HOLE available for attaching the GND side of this jumper. Just solder to the available foil.
7) On the non-component side of the PC board, install an insulated jumper between [SQ] and [+V].
8) Re-route the DC and AF leads out of the case, reinstall the PC board to the mounting frame, and reinstall the case.
9) Install DC and AF In connectors as appropriate. DONE!
Motorola External (Amplified) Speaker
Model:
NSN6027A (printed on case)
84D05644D01 (printed on AF Amp PCB)
AF Input to [In]
AF Gnd to [GND]
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