There are three regulators in the RF unit. The 1st regulator is used for the synthesizers and the VCTCXO. The 2nd regulator is used for the receiver and the transmitter discrete circuits. The 3rd regulator is for the CRFRT, integrated RF circuit. The regulators regulate the battery voltage to the fixed 4.8 V level. The receiver, synthesizer and transmitter circuits can be switched ON and OFF separately. Switching sequence timing depends on the operation mode of the phone.
Technical Documentation System Module
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You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.