Motorola CM340 Сервісна інформація - Сторінка 9

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Також для Motorola CM340: Посібник користувача (24 сторінок), Посібник користувача (5 сторінок), Посібник користувача (12 сторінок)

Controlhead Model for CM140 and CM340

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 controlhead 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 controller 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 controlhead speaker can be disconnected if an external speaker, connected on

the accessory connector, is used.

2.7

Electrostatic transient protection is provided for the sensitive components in the controlhead 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.

2-3