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Summary of Contents for UNIMO Technology PZ-400
- Page 1 Maintenance Manual PZ-series Portable Radio PZ-400, PZ-100...
- Page 2 Maintenance Manual TABLE OF CONTENTS FRONT ASSEMBLY .............................. 3 Microphone and Speaker ..........................3 REAR ASSEMBLY ..............................3 CIRCUIT ANALYSIS............................. 3 AUDIO/LOGIC SECTION ..........................3 R/F SECTION ..............................6...
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Page 3: Front Assembly
Maintenance Manual FRONT ASSEMBLY The Front Assembly includes the speaker, PTT key button, Monitor button and 4 function buttons. Microphone and Speaker The microphone mounts directly onto the main PCB board. The microphone receives audio through the hole in the front housing. The speaker mounted onto the front housing, and connects to the main PCB board through the solder wire. - Page 4 RF section is stored for transmit high power level, transmit low power level, audio deviation, data deviation and squelch. ☞ ☞ ☞ ☞ If replacement of U103 personality EEPROM, contact UNIMO Technology Co., Ltd. Customer Service to obtain programming information. CAUTION`...
- Page 5 Maintenance Manual U100 pin 63. This pin is analog-to-digital conversion port and the microprocessor measure the voltage level. And the result is indicated on the LCD battery indicator pixel. When the battery voltage drops below approximately 6.3Vdc, generates a low battery alert sound. Liquid Crystal Display (LCD) The LCD assembly is on the Board.
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Page 6: Synthesizer Circuit
Maintenance Manual The audio modulation signal is connect to the mod input of the VCO and sub-audible modulation signal is connected to the reference oscillator. The sub-tone signal(CTCSS, DCS) also can be added in the audio processor. For receiving PZ series radio, the IF signal is entered into audio processor chip through analog switch U105B. - Page 7 Maintenance Manual Voltage DC+5V TX5V1, RX5V1 Converter RF+3.3 Charge Pre Amplifier Loop Synthesizer (TX / RX) pump & Local filter IC(U302) Amplifier VCTCXO PLL_EN, PLL_DARA, PLL_CLK (U303) Audio/Tone modulation Voltage Controlled Oscillator (VCO) There are two 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 Power Control The Power Control circuit allows the radio transmit power to be set between 2 watt and 4 watts. It keeps the output power close to the set value in spite of variations in transmit frequency, battery voltage, temperature and load. - Page 10 Maintenance Manual RF Amplifier RF amplifier Q200 provides typically +15dB of gain to the RF signal. The output of the RF amplifier is coupled through tunable band-pass filter (U202). The center frequency of tunable band-pass filter is controlled by DA_BPF. The output of band-pass filter connected to the input of mixer circuit (Q203). Local Oscillator Buffer The injection frequency (354.7 ~ 414.7 ㎒...
- Page 11 Maintenance Manual When the channel spacing 12.5 ㎑ and 25 ㎑ are selected, Q55 and Q56 make the audio sound and the noise squelch in the same level. The squelch is adjusted in 10 steps by supplying the noise voltage of U301 (pin#14) to P2.6 A/D port of MPU (U51).
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