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File name TE04_Digital Cordless Telephone.pdf

5 ® Training Manual Digital Cordless Telephone Circuit Description and Troubleshooting Course: TE-04 Table of Contents Introduction Why Spread Spectrum? 1 1 Telephone Hook ON/OFF On/OFF Hook 19 19 Features Cordless Features Answering Machine Features 2 2 2 Incoming Telephone Line Amplifier TX Signal Processing IC701 Codec IC751 ASIC Troubleshooting 23 25 25 27 29 Narrow Band vs. Spread Spectrum Analog (Narrow Band) Digital (Narrow Band) Digital (Spread Spectrum) 3 3 3 3 RF Unit Transmitter TDD (Time Division Duplex) Receiver 31 31 33 35 Overall Block Base Handset 7 7 7 RX Signal Processing IC751 ASIC IC701 Codec 37 37 39 Matching Handset to Base Matching 9 9 Charging Charge Problems 11 11 Outgoing Telephone Line Amp Circuit Description 41 41 Link Establishment Heartbeat Link Establishment Protocol Master/Slave Operation (TDD) 13 13 14 14 Telephone Company Services Call Waiting Caller ID (Type 1 ON Hook) Call Waiting ID(Type 2 OFF Hook) Voice Messaging 43 43 43 43 43 Cordless Telephone Block (Base) Line Input and Ring Detect Line Input Ring Detect 15 17 17 17 Caller ID Data Format FSK (Frequency Shift Keying) Data Timing 45 45 45 Data Packet Type Formats 45 47 Call Waiting ID Format Data Timing 49 49 Loopback Tests RF Test Other Base Test Modes Audio System Tests Record and Playback Tests 70 72 74 75 76 Caller ID On Hook Amplifier Circuit Description 51 51 Service Bulletin No. 165 77 Caller ID Data Demodulation Input FSK Demodulator 53 53 53 Answering Machine Block (Base) Switching and AGC DSP Board IC201 TAD 55 55 55 55 TAM Switching Mic Recording Incoming Line Signals DSP Analog Out 57 57 57 57 AGC Switch 59 59 DSP Interface Cordless Telephone Block (Handset) Test Modes Handset Loopback Tests RF Test Base (Radio Block Test Modes) 61 63 65 65 66 67 69 1 Introduction Purpose of Course This course will introduce you to Spread Spectrum technology using the cordless phone model SPP-A967 as the example. We will cover the circuits, as well as testing, troubleshooting procedures and applicable use of a spectrum analyzer. In addition, we will discuss the new features of these phones, especially in areas that involve new telephone company services such as Caller ID and Voice Messaging. We will also describe the circuits and functions of the answering machine section. There will be emphasis on known problems from past models and on customer education/expectation issues. One major problem remained due to the fact that so many devices are using the 900 MHz spectrum. All of these systems transmitted using narrow bandwidth. This made it easy for them to be jammed or interfered with. This means that if two neighboring homes have cordless phones that are trying to operate on the same channel, the quality of the audio may be severely degraded or the phones could be rendered completely useless. The new Sony 900 MHz Digital Cordless Telephones and Cordless Telephone Answering Machines use a technology new to c