Motorola GP series Manuel utilisateur

Professional Radio

GP Series

Power Distribution and Controller

Service Information

Issue: November 2004

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iii

Table of Contents

Chapter 1 THEORY OF OPERATION

1.0 Overview ..............................................................................................................1-1

2.0 Radio Power Distribution .....................................................................................1-1

3.0 Controller Circuits ................................................................................................1-2

3.1 Controller Architecture....................................................................................1-2

3.2 MCU Digital Architecture ................................................................................1-2

3.3 Real Time Clock .............................................................................................1-3

3.4 ModB/Vstby Supply ........................................................................................1-4

3.5 Audio/Signaling Architecture ..........................................................................1-4

Chapter 2 TROUBLESHOOTING CHARTS

1.0 UHF/ UHF2 Controller..........................................................................................2-1

1.1 All models except those with PCB 8486458Z03.............................................2-1

1.2 Models with PCB 8486458Z03.......................................................................2-2

Chapter 3 CONTROLLER SCHEMATICS

1.0 Allocation of Schematics and Circuit Boards .......................................................3-1

2.0 Controller - Set 1 (PCB 8480450Z03, 8485641Z02, 8480587Z01,

8485677Z01, 8480641Z03) ......................................................3-3

3.0 Controller - Set 2 (PCB 8480450Z13/14, 8485641Z06).......................................3-9

4.0 Controller - Set 3 (PCB 8486458Z03, 8486686Z02)..........................................3-15

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Chapter 1

THEORY OF OPERATION

1.0 Overview

This Chapter provides a detailed theory of operation for the power distribution and controller circuits

in the radio. The components for these circuits are contained on the Main Board. Refer to the RF

sections of this manual for the component location details and the parts lists for these circuits.

2.0 Radio Power Distribution

Figure 1-1 illustrates the DC distribution throughout the radio board. A 7.5V battery (BATT 7.5V)

supplies power directly to the electronic on/off control as UNSWB+. When the radio is turned on,

MECH_SWB+ (on/off/volume control) will trigger the electronic on/off control (momentary-on path),

then SWB+ is distributed as shown in Figure1-1. Vdda from 3.3V Vdda regulator will then supply the

microprocessor. Data is then sent to ASFIC_CMP to turn on GCB4(DAC). GCB4 will take over the

momentary-on path within 12ms. SWB+ will continue to support the whole board until the radio is

turned off.

Radio will be turned-off on two conditions;

1. MECH_SWB+ turned off

2. Low battery

When low battery level is detected by the microprocessor through both conditions above, it will store

the radio personality data to EEPROM before turning off.

Figure 1-1 DC Power Distribution Block Diagram

Control

On/Off Switch

SWB+

Fuse

Low Battery

Detect

Ant. SW

PCIC(ALC)

PA, Driver

LI Ion

3.5V

Reg.

7.5V

Audio PA

4.0V/3.3V

Vddd

Reg.

ASFIC_CMP VCOBIC

FRACTN IF

LCD

Driver

RF. AMP, IF AMP

Ext. RX.

MECH.

SWB+

UNSWB+

TX.

Vdda

Reg.

Int/Ext Vdd

R5 R2 R3

Vdda

Accessories

20 pin Connector

Keypad/Option Board

Prime Expansion Board

Switching

Reg.

Vddd

Battery

Reg.

MCU Micro P, ROM

& EEPROM

Buffer (NU)

Led

Jumpers

Dual Vdd

Regulator

Scheme

Single Vdd

Regulator

Scheme

R1 Y Y

R2 N N

R3 N Y

R4 N N

R5 Y N

Vdda Y N

SW. Reg. N N

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1-2 THEORY OF OPERATION

3.0 Controller Circuits

3.1 Controller Architecture

The controller board is the central interface between the various subsystems of the radio. It is

separated into MCU digital and audio/signalling architectures as shown in Figure 1-2.

Figure 1-2 Controller Block Diagram

3.2 MCU Digital Architecture

(

Refer to Figure 1-2, the Microprocessor and the Memory schematic diagrams

)

The digital architecture portion consists of a microcontroller and associated EEPROM, RAM, and

ROM memories. The architecture is commonly used for both low-tier and high-tier products and also

includes conventional and trunking portables. Combinations of different size RAM and ROM are

available to support various application software. RAM supports 8KB and 32KB sizes. ROM

supports 128KB, 256KB, and 512KB sizes. Table 1-1 shows the ROM, RAM and EEPROM

requirements for different applications.

External

Microphone

Internal

Microphone

External

Speaker

Internal

Speaker

SCI to Side

Connector

Audio/Signalling

Architecture

To Synthesizer

Mod

Out

16.8 MHz

Reference Clock

from Synthesizer

Recovered Audio

Squelch

To RF Board SPI

MCU Digital

µP Clock

3.3V

Regulator

(Vddd)

RAM

EEPROM

ROM

Microcontroller

ASFIC_CMP

3.3V

Regulator

(Vdda)

Architecture

Audio Power

Amplifier/Filter

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Controller Circuits 1-3

3.3 Real Time Clock

(

Refer to Figure 1-3 and the Microprocessor schematic diagram

)

Radios with displays support a Real Time Clock (RTC) module for purposes of message time

stamping and time keeping. The RTC module resides in the microcontroller.The clock uses a back-

up Lithium Ion battery for operating power when the primary battery is removed.

3.3.1 Circuit Description

The RTC module circuit, shown in Figure 1-3, is powered by the ModB/Vstby pin and PI6/PI7 from

the crystal oscillator circuit. A clock frequency of 38.4kHz from a crystal oscillator provides the

reference signal which is divided down to 1 Hz in the processor.

Figure 1-3 RTC Circuit

As the RTC module is powered separately from the processor Vdd, the RTC is kept active through

the ModB / Vstby pin which provides the Lithium battery back-up power when the radio is switched

off.

Table 1-1 Radio Memory Requirements

RADIO ROM (KB) EXT RAM

(KB)

EEPROM

(KB)

Conventional MDC GP140 128K -8K

Conventional 5 Tone GP320, GP340 512K 16K 16K

Conventional 5 Tone GP360, GP380 512K 16K 16K

Privacy Plus GP240, GP280 512K 16K 16K

SmartZone GP540, GP580 512K 16K 16K

MPT GP640, GP680 512K 16K 16K

MPT GP1280 512K 16K 16K

LI_ION

R462

R419

CR411

Q416

C434

U410 3.3V

VIN VOUT

VSS

UNSWB+

R460

C435

R461

Vddd

HC11FL0

MODA

MODB

R420

R426

FL401 C436

C437

PI6

PI7

OUT

GND

38.4kHz

UNSWB+ SWB+

CR413

R463

300

Q417

TEST_POINT

TP405

BOOT_CTRL

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1-4 THEORY OF OPERATION

A MOSFET Q416 switches in the LiO supply when Vdd is removed. Q416 also provides isolation

from BOOT_CTRL function in the event of radio program flashing. The 3.3V regulator charges the

Lithium battery.

3.4 ModB/Vstby Supply

The supply to the ModB/Vstby pin varies depending on the conditions listed in Table 1-2.

3.5 Audio/Signalling Architecture

(

Refer to Figure 1-2 and the ASFIC/ON_OFF and Audio Power Amplifier schematic diagrams

)

The audio/signalling/filter/companding IC (ASFIC_CMP) and the audio power amplifier, shown in

Figure 1-2, form the main components of the audio/signalling architecture section of the controller

board. Inputs include a 16.8 MHz clock from the synthesizer, recovered audio and squelch, MCU

control signals, and external or internal microphones. Outputs include a microprocessor clock (uP),

modulator output to the synthesizer, and amplified audio signals to an internal or external speaker.

Table 1-2 ModB/Vstby Supply Modes

Condition Circuit Operation

Radio On Vdd supply voltage via CR411

Radio Off • Vdd turned off

• Q416 gate pulled low by R462

• Q416 switched on

• U410 supplies 3.2V to ModB/Vstby

Primary battery removed • Vdd turned off

• Q416 gate pulled low by R462

• Q416 switched on

• Lithium battery provides 3.2V to ModB/Vstby

Flash Mode • Boot_Ctrl line pulled low

• ModA & ModB go low

• Processor in boot-strap mode

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Chapter 2

TROUBLESHOOTING CHARTS

1.0 UHF/ UHF2/ 800MHz Controller

1.1 All models except those with PCB 8486458Z03

J403

Pin 9 low?

Pin 8

high?

MCU Check

Power Up

Alert Tone

OK?

Speaker

OK?

U409 EXTAL=

7.3728 MHz?

U201 Pin 19

16.8 MHz

5V at U247?

3.3V at U248?

U409

Reset

Pin 94

High?

MCU is OK

Not able to pro-

gram RF Board

ICs

Before replacing

MCU, check SPI

clock, SPI data,

and RF IC select

Replace

Speaker

Read Radio

OK?

Check

Setup

Reprogram the

correct data.

See FGU

Troubleshooting

7.5V at

Pin 3/5 U247?

4_3.3V at Pin 1

U248

Check

Q400

Replace

U247/U248

Check any short

to SWB+,

Vdda or Vddd

Press PTT. Red

LED does not

light up

PTT U409

Pin 53

low?

Press PTT

Q502-2

High?

Check

PB504

Check

Q502-2

voltage

LED

Q502,R501

OK?

Replace

Faulty

Component

Check

Accessories

J403

OPT_SEL_1 &

OPT_SEL_2

Pin 8 & 9

low?

Radio could

not PTT

externally

U409

Pin 52, 6

low?

See FGU

Troubleshooting

chart

LED should

light up

Check

MCU

PTT

YES

YES YES

YES

EXT

SPKR

EXT

PTT

INT

AUDIO

ASFIC U404

Pin 14 & 15

high?

Check

Accessories

Check

U404

Check

U420 Audio PA

YES

J403 Audio

at Pin 2 &

Pin 3

Check Spk. Flex

Connection

Audio at

AudioPA

(U420)

input

(U447)

Audio from Pin 41

ASFIC, U404?

Check

ASFIC U404

Check

Audio PA

(U420)

Check

U301

LV ZIF

Audio at

Pin 2

U404?

YES

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2-2 TROUBLESHOOTING CHARTS

1.2 Models with PCB 8486458Z03

MCU Check

Power Up

Alert Tone

OK?

Speaker

OK?

U409 EXTAL=

7.3728 MHz?

U201 Pin 19

16.8 MHz

5V at U247?

3.3V at U248?

U409 Reset Pin

94 High?

MCU is OK

Not able to pro-

gram RF Board

ICs

Before replacing

MCU, check SPI

clock, SPI data,

and RF IC select

Replace

Speaker

Read Radio

OK?

Check

Setup

Reprogram the

correct data.

See FGU

Troubleshooting

7.5V at

Pin 3/5 U247?

4/3.3V at Pin 1

U248

Check

Q400

Replace

U247/U248

Check any short

to SWB+,

Vdda or Vddd

Press PTT. Red

LED does not

light up

PTT U409

Pin 53

low?

Press PTT

Q502-2

High?

Check

PB504

Check

Q502-2

voltage

LED

Q502,R501

OK?

Replace

Faulty

Component

Check

Accessories

J403

OPT_SEL_1 &

OPT_SEL_2

Pin 8 & 9

low?

Radio could

not PTT

externally

U409

Pin 52, 6

low?

See FGU

Troubleshoot-

ing chart

LED should

light up

Check

MCU

PTT

YES

YES YES

YES

EXT

SPKR

EXT

PTT

INT

AUDIO

J403 Pin 9 low?

Pin 8 high?

ASFIC U404

Pin 14 & 15

high?

Check

Accessories

Check

U404

Check

U420 Audio PA

YES

J403 Audio

at Pin 2 &

Pin 3

Check Spk. Flex

Connection

Audio at

AudioPA

(U420)

input

(U447)

Audio from Pin 41

ASFIC, U404?

Check

ASFIC U404

Check

Audio PA

(U420)

Check

U301

IF IC

Audio at

Pin 2

U404?

YES

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