Service Manual

SRM9000 SERIES SERVICE MANUAL

3.6.2.3 3.3V Regulator U912

Regulated 3.3V supply (3V3)

• Reset U200

• PLA U300

• DSP U201

• Flash U202

• Digital supply for CODEC U800

Regulated 3.3V supply (3C3)

• Analogue supply for CODEC U800

Regulated 3.3V supply (3Q3)

• I/Q demodulator U401

Regulated 3.3V supply (3P3)

• Digital supply for PLL U701

Unregulated 13.8V (13V8_UNSW_F)

• Tx PA module U500

• Antenna changeover switch Q541/542/543

• Rx mute switch Q811

• Rx audio power amplifier U805

3.6.2.4 2.5V Regulator U903

Regulated 2.5V supply (2V5)

• DSP core U201

• PLA core U300

3.6.2.5 Negative Power Supply U904E/F

• -16V output (-16V) for VCO Varicap tuning drivers

• -12V Output (-12V) for Front end Varicap tuning drivers

3.6.2.6 Unswitched Battery (13V8_UNSW_F)

• Transmit Power Amplifier

• Speaker Amplifier