Motorola Gp328plus Gp338plus Gp338xls Detailed 6804112j28 G Manual

							2-1
Section 2
SERVICE AIDS
1.0 Recommended Test Tools
Table 2-1 lists the tools recommended for working on this family of radios. These tools are also 
available from Motorola.
Table 2-1: Recommended Test Tools
Motorola Part No.DescriptionApplication
6680387A59
6680387A64
6680387A65
0180382A31
Extractor, 2-contact 
Heat controller with safety 
stand or 
Safety stand only
Portable desoldering unit
Removal of discrete surface-mounted devices
6680375A74
0180386A81
0180386A78
0.025 replacement tip, 5/pk
Miniature digital readout 
soldering station (incl. 1/64” 
micropoint tip)
Illuminated magnifying 
glass with lens attachment.
For 0180382A31 portable desoldering unit.
0180386A82
6684253C72
6680384A98
1010041A86
1080370B43
Anti-static grounding kit
Straight prober 
Brush
Solder (RMA type), 
63/37, 0.020” diameter 
1 lb. spool
RMA liquid flux
Used during all radio assembly and disassem-
bly procedures
R-1070A
or  R-1319A
Shields and surface-
mounted component - IC 
removal/rework station 
(order all heat-focus heads 
separately) 
Shields and surface-
mounted component - IC 
removal/rework station 
SMD10000 M.A.P.E.
Removal and assembly of surface-mounted 
integrated circuits and shields
Removal and assembly of surface-mounted 
integrated circuits and shields 
						

							2-2Recommended Test Tools
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							3-1
Section 3
POWER UP SELF-TEST
1.0 Error Codes
Turning on the radio using the ON/OFF volume control starts a self-test routine which checks the 
RAM, ROM checksum, EEPROM hardware and EEPROM checksum. If these checks are 
successfully completed, the radio will generate the Self-Test Pass Tone. Radio emits only “bonk” (300 
Hz) tone if it fails the self-test.
Error CodeExplanationCorrective Action
“RAM TST ERROR”RAM Test FailureRetest radio by turning it off and turning it on again. If 
message reoccurs, replace RAM (U405). 
“ROM CS ERROR”ROM Checksum is 
wrong.Reprogram FLASH Memory, then retest. If message 
reoccurs, replace ROM (U406).
“EEPRM HW ERROR”Codeplug structure 
mismatch, non 
existence of 
 
codeplug.
Reprogram codeplug with correct version and retest 
radio. If message reoccurs, replace EEPROM 
(U407).
“EEPRM CS ERROR”Codeplug check-
sum is wrong.
Reprogram codeplug.
No DisplayDisplay module is 
not connected 
 
properly. 
Display module is 
damaged.
Check connection between main board and display 
module.
 
Replace with new display module. 
						

							3-2Error Codes
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							4-1
Section 4
CONTROLLER INFORMATION
1.0 Overview
This section provides a detailed theory of operation for the radio and its components.
2.0 Radio Power Distribution
Figure 4-1 illustrates the DC distribution throughout the radio board.  A 7.5V battery (BATT 7.5V) 
supplies power directly to the electronic ON/OFFcontrol as UNSWB+.  When the radio is turned on, 
MECH_SWB+ (ON/OFF volume control) will trigger the electronic ON/OFFcontrol(momentary-on 
path), then SWB+ is distributed  as shown in Figure 
4-1. 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
Figure 4-1: 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
Vddd
   Reg.
5V
ASFIC_CMP  VCOBIC   FRACTNLV Z I F    * LCD  Driver
5V
RF. AMP, IF AMP
Ext. RX. 
MECH.
SWB+ UNSWB+
TX. 
Vdda
   Reg.
R1 R5
R2R3
Vdda
Vddd
Battery
Reg.MCU Micro P, ROM 
& EEPROM
Buffer (NU) Led
JumpersDual Vdd 
Regulator 
SchemeSingle 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
*Not applicable to GP328 Plus 
						

							4-2Controller Board
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. 
3.0 Controller Board
3.1 General
The controller board is the central interface between the various subsytems of the radio. It is 
separated into digital and audio architectures. The digital portion consists of a special Motorola 
microcontroller (HC11FL0). The audio power amplifier (Audio PA) and audio/signalling/filter/
companding IC (ASFIC_CMP) form the backbone of the audio/signalling architecture.
Figure 4-2: Controller Block Diagram
External
Microphone
Internal
Microphone
External
Speaker
Internal
Speaker
SCI to Side
Connector Audio
  PA
Audio/Signalling
   Architecture
To Synthesizer
Mod
Out
16.8 MHz
Reference Clock
from Synthesizer
Recovered Audio
Squelch
To RF BoardSPI
    Digital
Architecture
µP Clock
   3.3V
Regulator
  (Vddd)RAM
EEPROM
ROMHC11FL0 ASFIC_CMP
   3.3V
Regulator
  (Vdda) 
						

							Controller Board4-3
3.2 Digital Architecture
MCU configuration 
There is one common MCU architecture for low-tier as well as for the high-tier products. It covers the 
Conventional and Trunking portables. An open architecture system with the new HC11FL0 as the 
processor is used. Combinations of different size RAM, ROM and EEPROM are available for various 
application software.
Real Time Clock (RTC) 
This radio supports Real Time Clock (RTC) module for  purposes of Message Time Stamping and 
Time Keeping. The RTC module resides in the micro-processor HC11FL0. It is kept alive by a back-
up Lithium Ion battery when the primary battery is removed. 
Circuit Description 
The RTC module which resides in the HC11FL0 is powered by the ModB/Vstby pin and PI6/PI7 form 
the crystal oscillator circuit. Clock frequency of 38.4kHz from a crystal oscillator provides the 
reference signal. In the processor, the frequency is divided down to 1Hz.
As the RTC module is powered separately from the processor Vdd, the RTC is kept alive through the 
ModB / Vstby pin when the radio is switched off. A small button Lithium Ion battery continues to feed 
the RTC when the primary battery is removed. 
A MOSFET Q416 switches in the Li (Lithium) Ion supply when Vdd is removed. Q416 also provides 
isolation from BOOT_CTRL function in the event of radio program flashing. A small 3.3V regulator is 
used to charge the Li (Lithium) Ion battery.
Figure 4-3: RTC Circuit
LI_ION
R462R419
3 4
215CR411
12
3Q416C434 U410
3.3V
3 2
1
VINVOUT
VSS
UNSWB+
R460 C435 R461Vddd
HC11FL0
MODA
MODB
R420
R426FL401C436
C437 PI6
PI7OUT
IN GND 38.4kHz
UNSWB+SWB+ 6
4 1
3 23 51
2 4CR413 R463
300
Q417
TEST_POINT TP405
1
BOOT_CTRL 
						

							4-4Controller Board
ModB/Vstby Supply 
Under various conditions, the supply to the ModB/Vstby would vary.  Table 4-1 shows these 
conditions and circuits in operation.
Table 4-1: ModB/Vstby Supply Modes
ConditionCircuit Operation
Radio OnVdd supply voltage via CR411
Radio Off• Vdd turned off
• Q416 gate is pulled low by R462
• Q416 is switched on
• U410 supplies 3.2V to ModB/Vstby
Primary battery removed• Vdd turned off
• Q416 gate is pulled low by R462
• Q416 is switched on
• Li Ion battery provides 3.2V to ModB/Vstby
Flash Mode• Boot_Ctrl line pull low
• ModA & ModB goes low
• Processor in boot-strap mode
• Flashing enabled 
						

							Controller Board4-5
3.3 Keypad
The LED_EN setting is set by the codeplug. When the value is set to high, the LED will not light up 
during power up and vice versa. 
U602 is a comparator that will compare the voltage  when  any one of the keypad row or  keypad 
column keys is being pressed. Therefore when a key is being pressed, it will send a message to the 
microprocessor through the output (KEY_INT) telling it that a key has been pressed. The 
microprocessor will then sample the Analog to Digital voltages at the keypad row and keypad column 
and map it with the table so that the key being pressed can be identified. Once the key has been 
identified, the message that corresponds to the key will show up at the display.
Figure 4-4: Keypad Block Diagram
Micro Processor
ComparatorKeypad
Button
LED
Display
18 pin connectorKey_IntKeypad Column
Keypad  Data
Row 
						

							4-6Controller Board
3.4 Troubleshooting Chart
Figure 4-5: Keypad Board Troubleshooting Chart
Display
Keypad 
LED
End
Disconnect and 
reconnect 18-pin 
flex
Disconnect and 
reconnect 40-pin 
flex
ONOFF
OFF ONIF STILL OFF