Motorola Radio Mcs2000 Vol 1 68p81083c20 A Manual

 
Troubleshooting 9-5 
Troubleshooting Chart 1-2 (3 of 3), Failure Codes 
Fail
002No
Yes
Program
codeplug
No
DATA on
U0105-13No
YesDATA on
U0103-63Yes Yes
U0104
OK?No
Yes
Yes
U0108
OK?
No
Repair or
Replace U0104Problem
Fixed
Fail
002No
Repair or
Replace U0108Check
U0103
Check
U0105
GOTO SB9600
Bus Rx Chart 1-10
Check
U0105
Check
U0103GOTO SB9600
Bus Rx Chart 1-10NoNo
DATA on
U0103-63DATA on
U0105-13Yes
Yes
Error
01/01 
Yes
2
From Sheet 2
WARNING
Refer to the IC Troubleshooting
Procedure before replacing...

 
9-6Troubleshooting 
Troubleshooting Chart 1-3, On/Off Circuit 
9.3V
on U0501-5
Check U0500,
CR0500, C0503Check U0501, Q0500,
C0508, R0503, R0504No
Yes
No
START
Pulse
on U0510-5
13.6V
on Q0511-6
5V
on U0500-2
Yes
Yes
Yes 0V
on U0510-6
No Press
On/Off Switch
Check U0510,
R0512, C0511No
Check CR0510,
Q0510, Q0511No
GOTO
Clock Distribution
Chart 1-9
YesR0518
OK?Repair or
Replace R0518
No
Yes
GOTO
Control Head
Chart 1-8
CHART 1-3   ON/OFF CIRCUIT TROUBLESHOOTING
Note:
Refer to IC Troubleshooting Procedure...

 
Troubleshooting9-7 
Troubleshooting Chart 1-4, TX Audio  
TX Audio Routing, SimpliÞed Schematic for Chart 1-4
1KHz
45mVrms on
U0200-B8
TP5800 has
1KHz ~114mVrms
AC with ~2.5VDC
offset
GOTO Band Specific
RF Transmitter
ChartCheck for solder defects
on U0200, C0218,
R0224, R0233
SPI lines
activity at
U0200-E3, F1
Check
U0103 Check
U0200 all bands,
U0250 for 900MHz Yes
YesYes No
No
NoInj:  1KHz Tone, 80mVrms
at the Internal Microphone
Ref: TX Audio Simplified Schematic
~  =  Approximately
Check
R0403,...

 
9-8Troubleshooting 
Troubleshooting Chart 1-5, RX Audio 
~800mVpp
on U0200-J7
Yes
Yes Yes Yes
Yes No
No
No
No
No
CHART 1-5   RX AUDIO
Check speakers
Check
U0203
Check R0234,
C0240, R0239
SPI activity
on pins 66, 67
of U0103Check
U0103 Inj:  1kHz Tone, 3kHz deviation at the appropriate
        RX frequency into the antenna connector.
Volume set to ~7.5 Vrms
Ref: RX Audio Simplified Schematic
~  =  Approximately
Check 
U0200
GOTO Band Specific
IF Receiver Chart
~375mVpp
on U0200-J4SPI activity at...

 
Troubleshooting9-9 
RX Audio Routing, SimpliÞed Schematic for Chart 1-5
C0250
0.1µFC0260
0.1µF
C0256
0.1µF
C0240
33nF
C0229      33pF
C0242
3.3nF SPK+ DISC
SPK-
R0234
4.7K½
R0245
10K
R0237
10K     R0235
1K½ 
FFINFFOUT
EXP IN
EXP OUT
HEAR CLEAR i
U0250 FLUTTER
FIGHTER
SUPPORT
COMPONENTS
APA
U0203 ACC
CONN
J0403
RX INPL IN
UNAT
RX
OUT
ASFIC
U0200
EXP
AUD
INRX
AUD
OUT
AMP
IN
SPK-
SPK+
6Vdc
C0202
0.22µF
C0999
.0033µF
VR0418
20VC0228
0.1µFC0434
470pF
R0232
0 
C0415
470pF
C0236
330pF
CONTROLLER BOARD RX...

 
9-10Troubleshooting 
Troubleshooting Chart 1-6, Signalling 
Yes
No
CHART 1-6   SIGNALLING
During TX
is there a 1 or 2kHz
signal at
U0200-C3?
YesNo
Radio mutes
if proper PL/DPL is
not presentYes
NoDATA ON
U0200-A4
Check for solder
defects on 
U0200Check
 U0103
Check
 U0200-01
Check
 U0104
START 

 
Troubleshooting9-11 
Troubleshooting Chart 1-7, DC Distribution 
CHART 1-7   DC DISTRIBUTION
No
Yes13.6V on
U0502-8
No
Yes8V on
U0502-1
No
Yes9.3V on
U0501-5
No5V on
U0500-2
Check C5613,
C5617, L5611,
R0432, J5500-1, 2
No
Yes13.6V on
connector J1Check DC
input and fuse
Check
U0502
No
Yes~13.0V on
U0501-1GOTO
On/Off Circuit
Chart 1-3
Check
U0501,
Q0500, C0508,
R0503, R0504 
Check
U0500,
CR0500, C0501,
C0504
Yes
No
Yes
5V on
U5802-3Check
U5802,
L5765, C5766,
C5767 
Check
U5801,
Q5770, C5770,
C5810
Ref:...

 
9-12Troubleshooting 
Radio Voltage, SimpliÞed Schematic For Chart 1-7
CONTROL
HEAD
9.3V
REG
U0501
CONTROLLER
TRANSMITTER
AUDIO
PA
U02038V
REG
U0502
5V
REG
U5802TX
P/A
MIC
VOLT
OPTIONS
J0401
J0408
K4 µP HEAR
CLEAR
U0250
SLIC IVA
U0104
5V
REG
U0500EEPROM
U0108
NOT PLACED
ELEC ON/OFF
PWR OFF DLY
U0510/Q0510/Q0511
ASFIC
U0200 F1 µP
U0103
ROM
U0106
RAM
U0101
FRAC N
U5801
A+
CONT
PEND
U5800
VCO
ACC CONNECTOR ZIF
U3201
5V
REG
J0405-17
J0405-18 J0405-16
J0405-7, 13A+
B
A
T
T
E
R
Y
UN
SW
5V
S
W
B
+
CASTING MAIN...

 
Troubleshooting9-13 
Troubleshooting Chart 1-8A, Control Head Model I  
Numbers in brackets refer to accompanying troubleshooting procedure overleaf.
Control Head Model C Troubleshooting Chart
Radio
can turn on/off?
(1.1)Check on/off switch (1.1)No
Yes
Radio
resets control
head?
(2.1)Error in radio!No
Yes Yes
5VDC
OK?
(1.2)Check 5V supply (1.2)No
Reset
circuit works?
(2.2)Check Q0652, U0657,
D0674 (2.2)No
Yes
Keypad
OK?
(7)Check electrical connection to µP
Clean PCB or replace keypad (7)No
Yes Yes...

 
9-14Troubleshooting 
Control Head I Troubleshooting Procedure 
1Power Supply 
Check that the radio is connected to a power supply.  
1.1ON/OFF switch 
-Check that radio turns on. I.e. SW B+ is 12V DC. If not, press the ON/OFF switch to turn the radio off 
again.
-If the radio does not turn ON, verify that there is DC voltage on the MIC-HI/ON_OFF line and that this 
voltage goes to ground when pressing the ON/OFF switch.
-If DC voltage is present, but does not go low, check J0650 and R0698.  
1.25V DC...