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C45 / M50 / MT50 Level 2.5e Repair Documentation V 1.0 V1.0 C45, M50 AND MT50 Page 1 of 46 Company Confidential © Copyright Siemens AG ICM MP CCQ ST 05/02 Table of Contents: 1 2 3 LIST OF AVAILABLE LEVEL 2,5E PARTS C45, M50 + MT50 ...4 REQUIRED EQUIPMENT FOR LEVEL 2,5E ...5 REQUIRED SOFTWARE FOR LEVEL 2,5E C45, M50 AND MT50 ...5 RADIO PART...6 Power Supply RF-Part ...7 Frequency generation...9 Synthesizer: The discrete VCXO (26MHz)... 9 Synthesizer: LO1... 11 Synthesizer: LO2... 13 Synthesizer: PLL ... 14 4 4.1 4.2 4.2.1 4.2.2 4.2.3 4.2.4 4.3 4.4 Antenna switch (electrical/mechanical) ...15 Receivers ...17 Receiver: GSM900/1800 ­Filter to Demodulator ... 17 IC Overview... 19 4.4.1 4.4.2 4.5 Transmitter ...20 Transmitter: Modulator and Up-conversion Loop... 20 Transmitter: Power Amplifier... 21 4.5.1 4.5.2 5 5.1 5.2 5.3 POWER SUPPLY ...22 Overview and Voltages...22 Power Supply ASIC...23 Battery and Charging...26 Battery... 26 Charging Concept ... 26 5.3.1 5.3.2 6 6.1 6.2 6.3 6.4 6.5 LOGIC PART ...