TM1215 Iss. 6.0 RPR750
3 Technical Description
3.1 PHYSICAL CONSTRUCTION
The RPR 750 Series receiver electronic hardware comprises two main printed circuit
board (PCB) assemblies, contained in a plastic housing. See Fig. 3.1.
Case Screws
Window
Display PCB
Decoder PCB
Case Rear
Battery Compartment Door Griptite Clip
Loudspeaker
Radio PCB
Rubber Spacer Mat
Loudspeaker Retaining Clip
PCB Fixing Screw
Function Buttons
Case Front
Figure: 3.1. Major Assembly Parts - RPR 750 Series
The case is constructed from Bayblend PC/ABS plastic in two main parts, front & rear,
with a detachable battery compartment door assembly in the case back. The principal
PCB's, the Radio and Decoder, are mounted one over the other, with electrical connection
between them achieved by means of a multi-way plug & socket assembly. The PCB
combination is then affixed to the case rear. The case front is detachable and holds the
loudspeaker assembly.
Radio PCB - this PCB contains the Dual Conversion radio receiver, a 1V regulator and a
low battery alarm function. Demodulated data and audio signals from this board are fed to
the Decoder PCB.
Decoder PCB - also sub-mounted on this PCB, are the LC display PCB and the vibrate
motor. The PCB contains the central processor, data decoding, speech storage and audio
amplification, the LC visual display drivers and the LC message screen and alert lamp.
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