UNIMO Technology PZ-400 User Maintenance Manual
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UNIMO Technology PZ-400, Maintenance Manual 2 TABLE OF CONTENTS FRONT ASSEMBLY .............................................................................................................................................. 3 Microphone and Speaker ................................................................................................................................. 3 REAR ASSEMBLY ..........................................................................................................................................
UNIMO Technology PZ-400, Maintenance Manual 3 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. REAR ASSEMBLY The Rear Assembly provides a die-casting frame for main board and sub-board. The antenna connects to a SMA type connector that is mounted to the top of the frame. The circuit of MAIN board of PZ series radio consists of the Aud
UNIMO Technology PZ-400, Maintenance Manual 4 the board. And the second sheet contains logic circuitry and audio signal circuitry. Microprocessor U501 A single microprocessor controls the all operation of the PZ 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. The microprocessor contains internal flash memory. The microprocessor normally executes the radio software code in this Fl
UNIMO Technology PZ-400, Maintenance Manual 5 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. It consists of a diffuser, zebra strips, the LCD and a lens. The primary function of the board is to drive a 112 x 16 graphic display and to drive the individual segment lines of the LCD. Serial display data from the microprocessor is sent to the LCD driver on the LCD
UNIMO Technology PZ-400, Maintenance Manual 6 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. The audio signal is on the output pin of the audio processor. The audio signal can be amplified by Audio amplifier chip. The CTCSS ton
UNIMO Technology PZ-400, Maintenance Manual 7 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 during transmit and the other is RX VCO which generates the 1 st LO frequency of 354.7 ~ 414.7 during the receive. These two VCO is selected by the VCO_TX and VCO_RX signal from the microprocessor. When VCO_TX signal is High, it turns transistor Q66 on and the TX5V1 (5Vdc) is su
UNIMO Technology PZ-400, Maintenance Manual 8 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 at ± 2.5ppm (-30°C~+60°C) to Phase- Locked-Loop circuit. The oscillator has modulation capability. Frequency is adjusted b
Maintenance Manual 9 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. To do this, the Power Control circuit maintains a steady powe
Maintenance Manual 10 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 Oscilla
UNIMO Technology PZ-400, Maintenance Manual 11 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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