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Related Manuals for UNIMO Technology PZ-S Series
Summary of Contents for UNIMO Technology PZ-S Series
- Page 1 Maintenance Manual PZ-S series Portable Radio Circuit Analysis PZ-S400, PZ-S100...
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Page 2: Table Of Contents
Maintenance Manual TABLE OF CONTENTS FRONT ASSEMBLY .............................. 3 Microphone and Speaker ..........................3 REAR ASSEMBLY ..............................3 CIRCUIT ANALYSIS ............................. 3 AUDIO/LOGIC SECTION ..........................3 Microprocessor U100 ......................4 3.3 Volt Regulator U50 ......................4 Personality EEPROM ....................... 4 Low Battery Sense ........................ -
Page 3: Front Assembly
SMA type connector that is mounted to the top of the frame. The circuit of MAIN board of PZ-S series radio consists of the Audio/Logic circuitry (which controls the 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. -
Page 4: Microprocessor U100
Maintenance Manual Microprocessor U100 A single microprocessor controls the all operation of the PZ-S series radio. All lines connect to the analog portion of the board are first RF bypassed by RC circuits. Most of these RC circuits are physically located as close as possible to each microprocessor pin of the board. -
Page 5: Liquid Crystal Display (Lcd)
LED evenly distributes the light. Audio Processor The Audio Processor U101 handles nearly all the audio functions in the PZ-S series radio. It has the audio filter that operates the basic functions of radio, the Limiter, the Splatter Filter, the Compander and the Scrambler. -
Page 6: Audio Amplifier (U59)
Maintenance Manual For receiving PZ-S series radio, the IF signal put into audio processor chip. The audio signal is on the output pin of the audio processor. The audio signal can be amplified by Audio amplifier chip. The CTCSS tone and DCS codes are decoded on the audio processor and pass through the microprocessor, Audio Amplifier (U59) The audio amplifier (U104) operates speaker and the maximum power output is 1.5 Watts with 16 Ω... - Page 7 Maintenance Manual Voltage DC+5V TX5V1, RX5V1 Converter RF+3.3 Pre Amplifier Loop Synthesizer (TX / RX) & Local filter IC(U302) Amplifier VCTCXO PLL_EN, PLL_DARA, PLL_CLK (U303) Audio/Tone modulation Voltage Controlled Oscillator (VCO) There are two kinds of Voltage Controlled Oscillator in the synthesizer circuit. One is the TX VCO which generates the actual transmit frequency of 400 ~ 470 ㎒...
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Page 8: Transmitter Circuit
Maintenance Manual of capacitor C431, C434, C432 and inductor L75. The output signal fed into the synthesizer IC and the feedback signal level is –15dBm. Transmitter modulation signal from Audio/Logic section is applied to R452, D77 and C413. Reference Oscillator (U303) Reference Oscillator U303 provides a reference frequency of 12.8 ㎒... -
Page 9: Receiver Circuit
Maintenance Manual temperature and load. To do this, the Power Control circuit maintains a steady power output level by APC. The transmit output power is controlled by varying the power control voltage (DA_TXPOW). The output transmit output power is monitored by D80 and produce a DC voltage. The Amplifier (U305) amplifies only the difference between the forward power level and DA_TXPOW level. - Page 10 Maintenance Manual Local Oscillator Buffer The injection frequency (354.7 ~ 414.7 ㎒) from the synthesizer circuit is applied to the base of LO buffer transistor Q105. The output signal level is +3dBm and is connected to the input of mixer circuit (Q201). Mixer The RF signal from the front-end and the injection frequency from the LO buffer is connected to the input IF (UHF : 45.3 ㎒, VHF : 21.4 ㎒) signal on the output of the...
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