Motorola GP series Operating and installation instructions

Professional Radio
GP Series
Power Distribution and Controller
Service Information
Issue: November 2004

ii
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Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or
reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer
programs contained in the Motorola products described in this manual may not be copied or reproduced in
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products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license
under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive royalty-
free license to use that arises by operation of law in the sale of a product.

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

iv

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.
5V
ASFIC_CMP VCOBIC
FRACTN IF
LCD
Driver
5V
RF. AMP, IF AMP
Ext. RX.
MECH.
SWB+
UNSWB+
TX.
Vdda
Reg.
Int/Ext Vdd
R1
R5 R2 R3
Vdda
Accessories
20 pin Connector
Keypad/Option Board
Prime Expansion Board
Switching
Reg.
R4
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

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

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
3
4
2
15
CR411
1
2
3
Q416
C434
U410 3.3V
3
2
1
VIN VOUT
VSS
UNSWB+
R460
C435
R461
Vddd
HC11FL0
MODA
MODB
R420
R426
FL401 C436
C437
PI6
PI7
OUT
IN
GND
38.4kHz
UNSWB+ SWB+
6
4
1
3
2
3
51
2
4
CR413
R463
300
Q417
TEST_POINT
TP405
1
BOOT_CTRL

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

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
NO
YES
YES
No
No
NO
YES YES
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
EXT
SPKR
EXT
PTT
INT
AUDIO
ASFIC U404
Pin 14 & 15
high?
Check
Accessories
Check
U404
Check
U420 Audio PA
NO
NO
YES
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?
NO
NO
NO
YES
YES
NO
YES

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
NO
YES
YES
No
No
NO
YES YES
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
YES
NO
NO
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
NO
NO
YES
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?
NO
NO
NO
YES
YES
NO
YES