Control Head Model for CM200
2-3
If the BOOT_RES (J802-7) line is connected to >5V (e.g. 9.3V) at turn-on, the uP will start in boot
mode instead of normal operation. This mode is used to programme new firmware into the FLASH
memory (U404 mainboard).
2.6
Speaker
The head contains a speaker for the receiver audio. The receiver audio signal from the differential
audio output of the audio amplifier located on the radio’s ler is fed via connector J803-1, 2 to the
speaker connector P801 pin 1 and pin 2. The speaker is connected to the speaker connector P801.
The control head speaker must be disconnected if an external speaker, connected on the accessory
connector, is used.
2.7
Electrostatic Transient Protection
Electrostatic transient protection is provided for the sensitive components in the control head by
diodes VR801, VR802, VR803 and VR804. The diodes limit any transient voltages to tolerable
levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.
Содержание Radius CM200
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Страница 29: ...CM200 CM300 PM400 Radios Control Head Service Information M Issue May 2009 ...
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