UNIMO Technology PZ-S Series Maintenance Manual Download | Manualshive

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Maintenance Manual

PZ-S series Portable Radio

Circuit Analysis

PZ-S400, PZ-S100

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Summary of Contents for PZ-S Series

Page 1: ...Maintenance Manual PZ S series Portable Radio Circuit Analysis PZ S400 PZ S100...

Page 2: ...ASSEMBLY 3 CIRCUIT ANALYSIS 3 AUDIO LOGIC SECTION 3 Microprocessor U100 4 3 3 Volt Regulator U50 4 Personality EEPROM 4 Low Battery Sense 4 Liquid Crystal Display LCD 5 Audio Processor 5 Audio Amplifi...

Page 3: ...functions of Radio and the RF circuitry which decides the communication quality and performance The circuit of sub board consists of battery connectors and fuse for protected the main circuit CIRCUIT...

Page 4: ...n and VCO can be controlled separately by microprocessor Personality EEPROM A 2048 X 8 bit EEPROM U103 stores all customer frequencies tones and option information Tune data aligned with the RF sectio...

Page 5: ...e main functions are as followings The amplifier and attenuator functions for Transmitting and Receiving signals The Pre De emphasis circuitry is built in The Compressor and Expander are built in The...

Page 6: ...d the first mixer injection frequency for the receive circuitry Transmit circuits Receive circuits DC voltage regulator circuits and TX RX switch circuits SYNTHESIZER CIRCUIT The synthesizer circuit c...

Page 7: ...requency of 400 470 for UHF model and 136 174 for VHF model When VCO_RX signal is High it turns transistor Q67 on and the RX5V1 5Vdc is supplied to the RX_VCO RX VCO oscillates transmit frequency by C...

Page 8: ...side band noise of reference frequency and obtain a high signal to noise TRANSMITTER CIRCUIT The transmitter section consists of a driver amplifier final amplifier power control circuit and transmitte...

Page 9: ...ection The output signal passes through the low pass filter L55 L56 C57 C58 C501 C502 C503 C504 C505 C506 C507 and C508 to remove of Spurious and Harmonic RECEIVER CIRCUIT The dual conversion receive...

Page 10: ...The output signal of IF amplifier connected through coupling capacitor C260 to the input of IF IC IF Detector circuit The IF IC U301 consists of the 2nd Mixer the 12 5 25KHz ceramic filter the Discri...

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