Motorola Gp328plus Gp338plus Gp338xls Detailed 6804112j28 G Manual

Circuit Board/Schematic Diagrams and Parts List5D-29
* Motorola Depot Servicing only** Not Serviceable
R342
0662057N23
100K
R343
0662057M26
10
R344
0662057N01
12K
R345
0662057M98
10K
R346
0662057N17
56K
R347
0662057M74
1K
R348
0662057M87
3.6K
R349
0662057C01
0
R350
0662057N23
100K
R351
0662057C01
0
R352
0662057M86
3.3K
R355
0662057M01
0
R501
0662057M70
680
R502
0662057M56
180
R505
0662057M98
10K
R506
0662057N15
47K
R509
0662057M01
0
RT300
0680590Z01
THERMISTOR_33K
RT400
0680590Z01
Thermistor 33K
S501...

5D-30Circuit Board/Schematic Diagrams and Parts List
THIS PAGE INTENTIONALLY LEFT BLANK 

Troubleshooting charts5D-31
9.0 Troubleshooting charts
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 
ICsBefore 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 
U248Check 
Q400
Replace U247/
U248
Check any short...

5D-32Troubleshooting charts
Bad SINAD
Bad 20dB Quieting
No Recovered AudioSTART
Audio at pin 27 
of U301?Check ControllerYe s
No
Spray of inject 1st IF into 
XTAL Filter
IF Freq: 45.1MHz
Audio heard?BYe s
No
Check 2nd LO Control 
Voltage at C363
VCO locked?BYe s
16.8 MHz 
check at pin 22 
U301?
Activity on 
U301 sel pin?
Check FGU
No
No
A
A
Ye sCheck Q320  bias cir-
cuitry for faults.
Rotate Freq. Knob
Check controller.
Before replacing U301, check 2nd VCO 
Q320. Check VCO O/P level, C351, 
C352. 
Ye s...

Troubleshooting charts5D-33
IF Signal at 
L311?
No
RF Signal at 
T301?
RF Signal at 
C310?
No
RF Signal at 
C307?
No
RF Signal at 
C301?
No or 
Check harmonic filters L101 & L102 and ant. 
switches CR101, CR102, L104
Check filter between C301 
& C307; program filter to 
schematic test freq and 
check varactor voltages.
Inject RF into J101
Are varactor 
voltages OK?
No
Ye s
Check RF amp (Q301) 
Stage.
Check filter between 
C310 & T301.
Ye s
Check T301, T302, 
CR306, R308, R309, 
R310
Ye s
1st LO O/P 
OK?...

5D-34Troubleshooting charts
START
No Power
Is There B+ 
Bias for Ant 
switchCheck Q111
Is Current 
OK?Is Control Voltage 
High or LowCheck PCIC
1. Check Pin Diodes
2. Check Harmonic Filter
Inspect/Repair Tx. Out-
put Network
Is Power 
OK?
Done
Check Drive to 
Module
Is Drive  
OK?
Troubleshoot 
VCO
Inspect PA Network/Check 
Power Out of U101 at Cap 
C160
Is Power 
OK?
Replace U101
Is Power 
OK?
Replace Q101
Done
Done
No
Ye s
Ye sNo
No
Ye sLow
High
No
Ye s
Ye s
No
Ye s
No
Troubleshooting Flow Chart for...

Troubleshooting charts5D-35
5V
 at pin 6 of 
CR201
Is information
from µP U409
correct?
Is U201 Pin 18 
AT 4.54 VDC?
Is U201 Pin 47 
AT = 13 VDC
Is U241 Pin 19
4.3 VDC in TX?
Start
Vis u a l 
check of the 
Board OK?Correct
Problem
Check 5V 
Regulator
+5V at U201
Pin’s
13 & 30?
Is 16.8MHz
Signal at
U201 Pin 19?
Check FL201, C206, 
C207, C208, CR203 & 
R204
Are signals
at Pin’s 14 &
15 of U201?
Check 
L202Check Q260, 
Q261 & R260
U201 pin 2 at 
>3V in Tx and 
-30 dBm?
Are R231,R232,
R233,C231,C232,
& C233...

5D-36Troubleshooting charts
START
No LO?
Tx Carrier?
VCO OK
Check 
R260
TRB = 5V?Pin 10 
>1V?
L253 O/C?Change 
L253
Change 
U241
AUX 3 
High?
Check U201 
Pin 2 for 3.2V
Pin 19 =0V
AUX 4 
High?
Change 
Q261
V ctrl 0V 
or 13V?
L243 Open 
Circuit?
Change 
U241
Change 
L243
Change 
U201
Check for faulty parts or dry 
joints of L271, L273, C370, 
C386, R339 & L320 A
A
No
No Ye s
Ye s Ye s
No
NoYe sYe s
Ye s
No
Ye sNoNoYe sYe s
No
No
Check R245 for dry 
joint or faulty
No
Troubleshooting Flow Chart for VCO 

6-1
Section 6
FLEX LAYOUT/SCHEMATIC DIAGRAMS AND PARTS 
LISTS
1.0 RF-Controller Interconnect Flex
1.1 Rev A
1.2 Rev B 
98C
J200
40J400
40
Front Metal
View From Top Side
98C
J200
40J400
40
Front Metal
View From Top Side 

6-2 Schematic for RF-Controller Interconnect Flex
2.0 Schematic for RF-Controller Interconnect Flex
CONTROLLER
J400
EXT_MIC
VS_CS
SW_B+
Vddd
VS_AUDSEL
Det_Aud_Snd
Rx_Aud_Rtn
Tx_Aud_Snd
Tx_Aud_Rtn
Flat_Tx_Rtn
Opt_Bd_En
Rdy/Req
Rx_Aud_Snd
ON
INT_EXT_Vdd
Key_Row
Key_Col
PTT
KEY_INT
VS_INT
RESET
LED_EN
OFF_BATT_DATA_OUT
VS_GAINSEL
SrD_Rtn (MISO)
SrD_Snd (DATA)
R_W
LCD_SEL
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
A0
SCK_Snd (CLK)
VS_RAC
Gnd1
2
3
4
5
6
7
8
9
10
11
12...