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NOTE: This amplified speaker (NSN0648A) uses a PC board with the ID# 84D05644D01 etched into the copper. This
model does NOT utilize external output transistors which are physically attached to the PCB mounting frame. If your PC
board HAS this ID number but DOES HAVE external output transistors, refer to the pages of this document which
reference model NSN6027A and PC board ID #84D05644D01.
1) Remove the speaker case and remove the screws holding the PC board to the internal frame.
2) NOTE that 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.
3) With the exception of the speaker wires, CAREFULLY desolder and remove ALL wires from the remaining PC board
holes.
4) Install new +12VDC DC power leads, connecting [GND] and [V+].
5) Install a shielded AF input lead (RG-174 works nicely), connecting to holes [GND] and [IN].
6) Re-route the DC and AF leads out of the case, reinstall the PC board to the mounting frame, and reinstall the case.
7) Install DC and AF In connectors as appropriate. DONE!
Motorola External (Amplified) Speaker
Model:
NSN6048A (printed on case)
84D05644D01 (printed on AF Amp PCB)
PC Board Connections
+12VDC to [V+]
DC Gnd to [GND]
And, add a jumper between [V+] and [SQ]
Modification Steps
AF Input to [In]
AF Gnd to [GND]
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