Motorola Gtx2000 Lcs2000 68p02945c70 O Manual

 
8-4 Troubleshooting
Troubleshooting Flow Chart
for Synthesizer
Start
Controller
Check synthesizer
loop filter.Replace U5702.
212mV on 
C5750? Is AUDIO MOD
YesNo
Is there 
Yes NoSYNTHESIZER DEVIATION
SYNTHESIZER PENDULUM 
Start
Is 2.1 MHz
Replace R5731.
Check C5733 
and R5715.
Replace U5702.
Replace L5700.
Check L5704.
Replace U5703. Replace U5700.
Check C5738, C5724, C5713
L5709.
Is 16.8 MHz
Is 5V present
at U5700-13?
Is 5V present 
at L5700?
Is 5V present
at U5703-2?
Is 9.3V 
present
at U5703-1? 
Is...

 
Troubleshooting 8-5
Troubleshooting Flow Chart
for Synthesizer (cont.)
NO Tx INJECTION 
Start
Is 5V present 
at Q5707-C?Check Q5707
Is 2.1 MHz 
present
at R5731?
 DC circuit.
Check Q5701 and 
 Q5705 DC circuits.
Check RF path
 line-up. 

 
8-6 Troubleshooting
Troubleshooting Flow Chart
for Power Amplifier
START
No No
No No
No NoYes Yes
Yes Yes
Yes YesIs PA controlIs Red light on?
Is control head 
Is K9.1 OK?Go to 
Go to Go to controller
Is there
Faulty power setting DAC
Faulty coupler.
Is  
Check R6519, U0701, 
Is Faulty current sense
Is 
Faulty integrator.Faulty REF voltage. Is
Is RF at 
Are voltages 
Is RF
Is RF after
Is RF after 
Replace Antenna Check CR6501, Q6506,
Check U6502, R6520, 
Replace U6501.
Check CR6502, CR6503,
Check...

 
Troubleshooting 8-7
Troubleshooting Flow Chart
for Controller
Start
Apply power to radio and
Was good or bad power-on
Yes
End Was good power-on beep Are alert tones
enabled with RSS?
Use RSS to enable tones.
Was good power-
on beep present?
Main radio board must be
replaced.
Are tones present
on power up at
U0202, pin 8
Audio problem. Trouble-
shoot audio circuitry. With power connected to radio and the radio turned
on, check the following:
1) 5 V at pin 1 of U631 and pin 71,12,31,41 of U0101.
2) Check...

 
8-8 Troubleshooting
Troubleshooting Flow Chart
for Control Head
Start
Check controller. Check LCD, U0932, 
Q0953, and ZEBRA
connectors.
Check U0941,
Q0942-4,
D0942-4.
Check R915-922, 
R955, and R958.Do the LEDs
light?
Check U0942, and U0970. Is backlight OK?
Is volume OK? Check U0941, Q0951,
Q0952,D0951-D0970.
Is keypad
OK?
Is the display
on?Is SPI 
communication
OK?
End
Yes
No
Yes
Yes
Yes No
Yes YesNo
No
No
No 

May 1996  68P02945C70-O   1
SCHEMATIC DIAGRAMS,  

2 68P02945C70-O   June 1996
Schematic Diagram for FLF5582A Main Board, 
13k 

 
June 1996 68P02945C70-O  
  
3
Schematic Diagram for FLF5582A Main Board,
Synthesizer Section
 
K9.1
K9.1
TX_INJ
9V3 RF_REG_5VPEND_SEL
10nFC5744
10nF C5747
C5798
0.1uF 0.1uFC5799 SPI_CLK SYNT_LOCK
SPI_DATA
PEND_SENS SYNT_SEL
MOD_IN
2.1MHZLO_INJ DET_AUDIO DET_AUDIO
RSSI RSSI
ADAPT ADAPT
R5753 IF6_5
33
39pF C581322 R5755
39pF C5814
270 0.1uF
R5757
270 R5756 C5806
E5704
SHIELDR5748
22 IF5_5
IF5_7IF6_9
IF7_2 IF5_4
IF6_11
IF5_6L5708
150nH TP5702
TSTP TP5700
TSTP
TP5703
TSTP
TP5701
TSTP IF6_3
Q5707330 R5752...

 
4 
68P02945C70-O June 1996
Schematic Diagram for FLF5582A Main Board, 
Power Amplifier Section, Power Amplifier Sub-section
 
1V @ Tx1.8V @ Tx
2.6V @ Tx 1V @ Tx0.3 - 1V
+18dBm+24dBm
(-) (+) POWER CONNECTOR
ANTENNA CONNECTOR
73D02947C26-O
SHEET 1 OF 2
68nH L6517
1uF
R6520
SHUNT
39pFCURRENT_SENSE_
RX_IN PA_TEMP K9.1 PA_CNTRLVFORWARD
TX_INJ
39pF C6518 GNDR6527
300
PA_K9.1 A+_CURRENT_SENSE+RF_OUT
C6527
IF42 IF11 TSTP3.3pF
J6501COAX_BNC
1
GND 2 L6502
7.66nH
C6553 +DC|SUP.
4
+DC|SUPP.
6 GND
7 GND1 1...

June 1996 68P02945C70-O 
5
Schematic Diagram for FLF5582A Main Board,
Power Amplifier Section, Power Control Sub-section
R0704
DAC_CE_7PA_CNTRL 10k
A+_CURRENT_SENSE+ CURRENT_SENSE_ TEMP
ANA_FREQ_CONT
SPI_CLCK_SRC
K9.1 R0734 C0701
MC3303
IF3_8
IF_IN122k
C0712
IF_IN1IF3_5R0702
22nF2.2k
C0727C0711
0.1uF
PA_PWR_SET 9V3
PA_ENABLE SPI_DATA_SRCSW_B+VAG
K9.1_ENABLE9V3 VAG
9V39V3
PA_TEMP VFORWARD3.3k R0705
R0722
22kR0711
IF3_3
IF_IN1 IF3_7
IF_IN122k
IF_SS1 IF7_4 IF_IN1 IF3_1
4.7k R0735IF_IN1 IF2_2 IF_IN2 IF2_1...