Hytera PT580 Manuel utilisateur

Service Manual

Contents

Revision History .............................................................................................................................................. 1

Copyright Information..................................................................................................................................... 1

Disclaimer......................................................................................................................................................... 1

Introduction...................................................................................................................................................... 2

Product Controls ............................................................................................................................................. 3

Circuit Description........................................................................................................................................... 4

Tuning Description ........................................................................................................................................ 17

Interface Definition........................................................................................................................................ 18

Troubleshooting Flow Chart......................................................................................................................... 23

Disassembly and Assembly ......................................................................................................................... 43

Exploded View ............................................................................................................................................... 48

Parts List 1...................................................................................................................................................... 50

Packing Guide................................................................................................................................................ 52

PCB View........................................................................................................................................................ 53

Schematic Diagram ....................................................................................................................................... 57

Parts List 2...................................................................................................................................................... 76

Specifications .............................................................................................................................................. 100

Service Manual

Revision History

Version Date Description

V00 08-2011 Initial Release

Hytera is the trademark or registered trademark of Hytera Communications Co., Ltd. (the Company) in

PRC and/or other countries or areas. The Company retains the ownership of its trademarks and product

names. All other trademarks and/or product names that may be used in this manual are properties of

their respective owners.

The product described in this manual may include the Company’s computer programs stored in memory

or other media. Laws in PRC and/or other countries or areas protect the exclusive rights of the Company

with respect to its computer programs. The purchase of this product shall not be deemed to grant, either

directly or by implication, any rights to the purchaser regarding the Company’s computer programs. Any

of the Company’s computer programs may not be copied, modified, distributed, decompiled, or

reverse-engineered in any manner without the prior written consent of the Company.

Disclaimer

The Company endeavors to achieve the accuracy and completeness of this manual, but no warranty of

accuracy or reliability is given. All the specifications and designs are subject to change without notice

due to continuous technology development. No part of this manual may be copied, modified, translated,

or distributed in any manner without the express written permission of us.

If you have any suggestions or would like to learn more details, please visit our website at:

http://www.hytera.com.

Service Manual

Introduction

Intended User

This manual is intended for use by qualified technicians only.

Service Manual

Product Controls

No. Part Name No. Part Name

○

1SK1 (programmable) ○

2PTT Key

○

3SK2 (programmable) ○

4Emergency Key

○

5LED Indicator ○

6Antenna

○

7Multi-function Control Knob ○

8Receiver

○

9Display ○

10 Function Keypad

○

11 Speaker ○

12 Numeric Keypad

○

13 Light Sensor ○

14 Battery Latch

○

15 Duplex Microphone ○

16 Simplex Microphone

○

17 Accessory Jack Cover ○

18 Accessory Jack

○

19 Strap Hole ○

20 Belt Clip

○

21 Battery ○

22 Charging Piece

Service Manual

Circuit Description

1. RF Section

The frequency range for PT580 F5 is 806~870MHz (in TMO mode, the frequency range for TX is

806~825MHz, while the frequency range for RX is 851~870MHz; in DMO mode, the frequency range for

both TX and RX is 851~870MHz). The block diagram for the RF section is shown below.

PA Cartesian

Loop ASIC RX FGU POWER_RF

BB TOP

Figure 1 Diagram of RF Section

The RF section consists of PA module, Cartesian Loop ASIC module, RX module, FGU and power

supply module (POWER_RF).

1.1 TX Circuit

Service Manual

Cartesian IC

DCMEAS

RF_SCLK

RF_DIN

RF_DOUT

TxI+

TxI-

TxQ+

TxQ-

Tx_LO

3V_Tx

RF_SW

7V5

Antenna

3V6_RF

3V_A

Temperature

Sensor

RF_FB

TMP_ALERT

SDA

SCL

PA_BIAS1

PA_BIAS2

3V_TxA

3V_TxD

attenuator

CSN

DOI

DOQ

RF_FB

Figure 2 Diagram of TX Circuit

The TX circuit consists of PA, harmonic filter, pre-amplifier, duplexer, coupler, temperature sensor,

TX/RX switch, antenna and etc. The working principle of the TX circuit is described below:

The TX circuit sends the I/Q signal from the baseband section to the Cartesian IC, which outputs

800MHz TX signal after appropriate processing. The TX signal goes to the filter and then to the PA circuit

for amplification after it is converted by BALUN.

The PA circuit is to amplify the RF signal output by the Cartesian IC to obtain an appropriate power level.

Then the signal passes through the TX/RX switch and is sent out from the antenna.

The feedback channel is to couple the power output by the main PA to the Cartesian IC, to form a

complete Cartesian loop. In this way, the output power can be controlled via the attenuation of the

feedback loop.

The temperature sensor will give protection signal if the PA temperature is too high. In such case, the

output power of the PA will be decreased appropriately to prevent damage to the parts.

The signal output by the main PA passes through the TX/RX switch and then goes to the antenna. The

TX/RX switch controls the TX/RX status according to the control signal output by the baseband.

The interfaces between the TX circuit and the baseband or other circuits are described below.

(1) TMP_ALERT

This is the alarm output interface of the temperature sensor, and is connected with the baseband. It

Service Manual

outputs low level during normal operation, and outputs high level to notify the baseband to reduce the PA

power if the temperature exceeds the preset level.

(2) PA_BIAS1 (same as PA_BIAS2)

This interface is used by the baseband to set the bias status of the PA. In TX status, the level is 2.47V.

(3) RF_SW

This interface is used to transfer the TX/RX switch signal output by the baseband. In the case of high

level, the antenna switch is connected to the output end of the PA, and the RF signal output by the PA is

sent to the antenna via the antenna switch. In the case of low level, the receiver is on, while the

transmitter is off. The antenna switch is connected to the RX interface.

(4) RX

This interface sends the signal to the RX module when the RF_SW switches to the RX end.

(5) RF_FB

This interface feeds the coupled signal back to the Cartesian IC to control the output power.

(6) Tx I+/- and Tx Q+/-

These interfaces are used to transfer the I/Q differential signals from the modulator. The DC level of the

signals is 1.6V, and Vp-p is 1.3 V.

(7) RF_SCLK/RF_DIN/RF_DOUT/CSN

These interfaces are used to transfer the clock signal, data signal and enable signal from the baseband,

and used by the baseband to program the register.

(8) DCMEAS

This interface is used to transfer the signal sent to the baseband for determining whether the DC

calibration is successful.

(9) TX_LO

The signals generated by the TX 1st LO are sent by the VCO to the Cartesian IC, where they are divided

to TX carrier signals. This interface is used to transfer such TX carrier signals.

1.2 RX Circuit

Service Manual

LNA IF Amplifier

IF BPF

Mixer

Diplexer

ANT

BPF BPF

Buffer

Demodulator

LPF

Rx_LO1 Rx_LO2

Rx PLL

IQ Processor

ANT Switch

GPS TX

3V_Rx

RX I+

RX I- RX Q+

RX Q-

AGC

Figure 3 Diagram of RX Circuit

The working principle of the RX circuit is described below:

The RX signals pass through the RF switch. First, they are filtered to remove out-of-band signals. Then

they are amplified by the LNA and filtered again. After that, the signals are sent to the mixer for

appropriate processing. The signals output from the mixer are processed by the IF low-noise amplifier

and then by the IF filter to select desired IF signals for demodulation. The obtained I/Q signals are

filtered and finally sent to the baseband for processing.

The interfaces between the RX circuit and the baseband or other circuits are described below.

(1) 3V_RX

This interface is used to transfer the receiver on/off signal from the baseband. If the signal is at high level,

the receiver is on and the RX channel works.

(2) RX

This interface is used to transfer the RX signal output by the antenna switch of the PA.

(3) RX_LO1

This interface is used to transfer the first RX LO signal output by the VCO.

(4) RX_LO2

This interface is used to transfer the second RX LO signal (level: -10dBm) output by the VCO. The signal

enters the IF demodulator, where it is divided and then demodulated together with the first RX IF signal.

(5) AGC

The AGC control voltage from the baseband enters via this interface, to stabilize output of the I/Q

Service Manual

demodulator. The AGC voltage varies within 0.2V~1.2V. When the AGC control voltage is 0.2V, the gain

gets to its maximum value.

(6) Rx I+/ - and Rx Q+/-

These interface are used to transfer the differential I/Q signals output by the I/Q demodulator.

1.3 FGU

3a3

4a4

Vcc 1

GND

PLL IC

12MHz _REF

SYN_ON

SYN_CS

SYNTH _LOCK

Loop Filter RxVCO 2

CPout IF

LOOP Filter TXVCO & RXVCO1

CPout RF

5V_SYN

FLout IF

FLout RF

FinIF

FinRF

Figure 4 Diagram of FGU

The working principle of the FGU is described below:

The reference frequency output by the baseband enters the PLL for frequency division. Meanwhile, the

frequency generated by the VCO goes to the divider for frequency division. Then the signals resulted

from both frequency divisions are sent to the phase detector for phase detection. If the signals have

different frequencies or phases, the phase detector will output a signal corresponding to the phase

difference. The signal goes to the low-pass filter to remove high-order harmonics, so as to control the

oscillation frequency of the VCO.

The interfaces between the FGU and the baseband are described below:

(1) FinRF

This interface is used to transfer the feedback signal from the TX/RX VCO to the PLL.

(2) FinIF

This interface is used to transfer the feedback signal from the RX IF VCO to the PLL.

(3) CPout RF

This interface is used to transfer the charging voltage signal from the PLL to the TX/RX VCO.

(4) CPout IF

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