Motorola Radio Mcs2000 Vol 1 68p81083c20 A Manual

Troubleshooting9-25
Troubleshooting Chart 1-10, SB9600 BUS RX 
Data
J0403-6,
J0403-18?
Data
U0401-2 pin 6,
U0401-2 pin 5?
Data
U0105-13?
Yes Yes
Yes Voltages on
SB9600 Voltage
Table correct?Correct as required.
Suggestion: Check for
shorted zener diodes.
No
Perform the following while sending data.
i.e. Control Head button press,
Channel Change, Radio OFF/ON.
Check VR0420,
VR0419No
Check R0410,
R0411, C0437No
Check
R0130, U0401No
Check
U0103
Check
R0129
Data
U0105-14?U0105
OK?
Yes
No
NoYes
Data...

9-26Troubleshooting
Troubleshooting Chart 1-11, SB9600 BUS RX 
SB9600 Voltage Table for Charts 1-10 & 1-11
Data
U0103-64?
Data
J0403-6?
Yes
NoBusy
Voltage OK per
SB9600 Voltage
Table
Yes
No
Check Q0401,
R0413, R0415,
R0414, Q0402No
Yes
Check
U0104
Check
J0403
Check
U0103 Perform the following while sending data.
i.e. Control Head button press,
Channel Change, Radio OFF/ON.
START
Note:  Verify Voltages per 
SB9600 Busy Simplified Schematic.
J0403-18
J0403-6
J0403-5
J0403-19
U0401-2, PIN 8...

Troubleshooting9-27
SB9600 BUSY, SimpliÞed Schematic for Charts 1-10 & 1-11
SB9600, SimpliÞed Schematic for Charts 1-10 & 1-11
C0439
470pf
C0438
470pf (5V)
[4.25V]
(0V)
[4.9V](5V)
[0.06V]
(0V)
[1.5V] (0V)
[4.9V]
(5V)
[0V] R0424
4.7K
R0427
2K
R0425
4.7K
Q0406
Q0407 VR0421
R0426
4.7K +5 +5
BUSY_IN
U0103-76 SLIC
BUSY_OUT
U0104-G4
BUSY
J0403-5
( V ) - Voltages when radio is in STEADY STATE
[ V ] - Voltages when radio is asserting busy
          in order to take control of SB9600 BUS
Q0426Q0100
Q0420 Q0400...

9-28Troubleshooting
Troubleshooting Chart 1-12, GPIO 
GPIO
Function?Output
Input
START
Yes
Are
J0403-7,8,16,
20, 21 at the right
voltage
(0 or 5V)?
No Check cable
used to interface
to the radio
Check U0104
and for emergency
check U0510
Check
U0104
Yes Are
VR0424,VR0425,
VR0426,VR0429,
VR0430,VR0431
OK?Are
VR0425,
VR0426, VR0429,
VR0430, VR0431
OK? No
Repair or replace
defective device
Repair or replace
defective componentRepair or replace
defective device Repair or replace
defective device
Repair or...

Troubleshooting9-29
Troubleshooting Chart 1-13 (1 of 2), Power Control 
Check R0567,
R0569, and
C0562
Set to
High Power
and retest
Using RSS, set current limit
values to zero and program
into radio (F8).  Go into
Transmitter Power Tuning Screen.
See Band Specific
TX Troubleshooting
Chart for proper setupUsing RSS, check 
personality for the
channel of interestIs it set to
Low Power? 
Set to values
within range
specified in Table 1
and retest
Check Q0553,
Q0552, R0586,
R0585 or (R0528)
Check
R0404
Check...

9-30Troubleshooting
Troubleshooting Chart 1-13 (2 of 2), Power Control 
GOTO Band Specific
TX Troubleshooting
Chart
Is
PA_CNTL (TP0400)
4.0V?Is
U0550 pin 3
near 4.65V?YesYes
No
GOTO Band Specific
TX Troubleshooting
ChartCheck
R0576, R0582,
C0551 and 9.3V
SupplyIs
U0550 pin 7
>4.0V?No
Check U0550, R0546, R0547,
R0548, R0549, R0557, R0558,
R0559, R0560, R0580, R0583,
R0589, R0598, and C0557Is
CUR_LIM_SET
(U0551 pin 4)
>7.0V?No
Yes
Repair or
replace defective
component Are
Q0554, R0563,
R0573, C0566,...

 
10-1 
Diagrams and Parts Lists 
10 
Notes on Sheet Port Connections, Circuit Block Port Connections and Physical Connectors  . . . . . . . 10-2
Notes on Sheet Port Connections, Circuit Block Port Connections and Physical Connectors  . . . . . . . 10-2
Example of Transceiver Board Block Connection Diagram (110 Watt Radio)  . . . . . . . . . . . . . . . . . . . . 10-3
Low Power Radios Exploded View Diagram and Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
Mid Power...

 
10-2 
Notes on Sheet Port Connections, Circuit Block Port Connections 
and Physical Connectors 
On the schematic drawings there are three different signal connection markers as described below. 
Sheet Port Connection 
The Sheet connection appear as  or  . These markers indicate that the signal shown on a given page 
continues to another schematic page. Typically the arrow direction indicates whether it is an input of output. These 
are used because the complete circuit scheme could not Þt on one...

 
10-3  
Figure 10-2   Example of Transceiver Board Block Connection Diagram (110 Watt Radio)
PA  BOARD
MEPC-97057-O/None
BATTERYANTENNA+-
GND
VSUM
VFWD BUF
SPK -
SPK +
CL UNSW 5V
UNSW 5V
Vaud
Vdd
+5V
PWR RST
SWB+
A+
B+ ON/OFF
CLEAR
AUPA EN
B+ IGNITION
RX AUDIO
GND
GNDD
A+ CNTL
PA CNTL
CURR SENSE +
CURR SENSE -
PA TEMP
K 9.1V
V FORWARD
V CNTL
GND
GNDD
A+ 
PA CNTL
CURR SENSE +
CURR SENSE -
PA TEMP
K 9.1V
V FORWARD
V DRIVEAUDIO MOD
SYN SEL
LOCK DET
ROSC SEL
9.3
CLK
SPI TX DATA
2.1 MHz
RF REG 5V
GND
AUD...

 
10-4
6
7
8
14
15
16
18
19
8
5
4
3
2
1
Exploded View Parts List, Low Power
*  Number of screws can vary depending on the model.ITEM
NO.MOTOROLA
PART NO. DESCRIPTION
1 3205931V01 Gasket, Front Cover 
2 1505908V02 Top Cover
3 3205934V01 Gasket, Top Cover
4 2605652W02 Pressure Plate
5 5584300B04 Handle, 800 MHz only
6 2604802K01 PA Shield, 800 MHz only
7 4205938V01 Clip Spring, 2 pcs.
8 0310907C69 Screw, M3X0.5X10,6 pcs
*.
9 0905902V01 Power Connector
10 3205457Z02 Gasket, Power Connector
11 0905901V01...