Motorola Commercial Series Service Information - Page 25

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Motorola Commercial Series Service Information
Troubleshooting Table for Board and IC Signals
IC Designator
U251
VCO / Buffer
U310
5V Regulator
U320
3.3V Regulator
U330
3V Regulator
U401
Microprocessor
Pin
Pin Function
12
Prescaler output
13
TX switch output (NU)
14
Vcc_BUFFERS
15
TX VCO emitter
16
TX VCO base
17
GND_LOGIC
18
Vcc_LOGIC
19
TRB input
20
FLIP input
1
Vin
2
Ground
3
Control input
4
Bypass capacitor
5
Vout
1
Ground
2
Feedback
3
Tap (NU)
4
Vin
5
Vout
6
Sense (NU)
7
Error (reset output)
8
Shutdown input
1
Vin
2
Ground
3
Control input
4
Bypass capacitor
5
Vout
1
PD4_SCK serial clock input
2
PD5_SS
3
PD6_VLIN
4
PG7_R_W
5
PG6_AS
6
PG0_XA13
7
PB7_ADDR15
8
PB6_ADDR14
9
PB3_ADDR11
DC Voltage
Comments (Condition)
2.26
0.06
3.00
0
(RX mode)
0
(RX mode)
GND
3.00
0.03
From U201-2 (RX mode)
GND
7.48
GND
7.48
1.26
4.96
GND
1.23
0
7.48
3.23
0
3.20
7.48
7.48
GND
7.48
1.26
3.00
0
3.23
ASFIC chip select
3.23
EEPROM chip select
3.21
3.23
3.23
0.026
0.028
3.06
3-9