Talk Back Modification - Ranger RCI-2950 Service Manual

· Well here go's The talk back is done by cliping one end of D-78. or you can wire a spdt switch to switch on and off!
· A common way to obtain talk-back on the 2950 is to lift one leg of the diode marked D-78. Many times, a switch is
installed to create a switchable talk-back. This is probably not the only way to enable the talk-back feature, but it's an
easy way. To disable the talk-back, make sure there's a 1N914 type diode in the D-78 position. If that doesn't work,
trace the D-78 circuit to make sure nobody performed the mod by cutting a trace on the solder side of the board. To
locate D-78, remove the covers. Orient the radio with the speaker side up, and the display facing you. In the upper right
quadrant, you'll see IC-14 (the audio IC) mounted to the chassis. You'll also see T-1 to the left of IC-14. D-78 is toward
the front of the radio a bit from T-1. I hope this helps and good luck..
· The removal of D-78 will indeed provide a talk-back, but it will be very scratchy and distorted. Try it this way instead:
1. Cut D-78 . Wire a SPST switch in series with D-78 to make it switchable.
2. Replace D-115 with a .0047uF disc cap.
You will now have a clear and natural sounding talkback guaranteed to make you smile!

TALK BACK MODIFICATION

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