Troubleshooting Chart 1-11, Sb9600 Bus Rx; Sb9600 Voltage Table For Charts 1-10 & 1-11 - Motorola MCS 2000 Service Instructions Manual

Troubleshooting Chart 1-11, SB9600 BUS RX

Check Q0401,
R0413, R0415,
R0414, Q0402
SB9600 Voltage Table for Charts 1-10 & 1-11
J0403-18
J0403-6
J0403-5
J0403-19
U0401-2, PIN 8
U0105-11
U0105-13
U0103-63
R0129
9-26 Troubleshooting
START
Perform the following while sending data.
i.e. Control Head button press,
Channel Change, Radio OFF/ON.
Data
U0103-64?
Yes
Data
No
J0403-6?
Yes
Check
J0403
SB9600 VOLTAGE TABLE
NOMINAL
VOLTAGE DURING
PIN
VOLTAGE
5V
0
0V
5
OPPOSITE POLARITY OF J0403-18
5
5
5
PIN 4 0
PIN 6 0
PIN 5 5
OPPOSITE POLARITY OF PIN 6
PIN 7 5
5
5
-14
5
5
Note: Verify Voltages per
SB9600 Busy Simplified Schematic.
Busy
Voltage OK per
No
SB9600 Voltage
Table
Yes
Check
U0103
FUNCTION
MESSAGING
Not Used in
5
Normal Operation
5
OP Amp Vdd
0 OP Amp GND
BUS_SCI
TRACKS STATE OF PIN 5
U0105 SCI_SELECT
5
(Flash Prog/Normal Mode Select)
TRACKS STATE OF
U0401-7 AND J0403-6
TRACKS STATE OF U0401-7,
J0403-6 AND U0105-13
No
Check
U0104
BUS -
BUS +
BUSY
BUS -
BUS +
SCI
SCI_RX
SCI_RX