Motorola Commercial Series Service Information page 27

Troubleshooting Table for Board and IC Signals
IC Designator
U401
Microprocessor
Pin Pin Function
46 PH1_PW2
47 PH0_PW1
48 XIRQ
49 PI7
50 PI6
51 PI5
52 PI4
53 PI3
54 PI2
55 PI1
56 PI0
57 MODB_VSTBY
58 MODA_LIR
59 AVDD
60 PE7_AN7
61 PE6_AN6
62 PE5_AN5
63 PE4_AN4
64 PE3_AN3
65 PE2_AN2
66 PE1_AN1
67 PE0_AN0
68 VRL
69 VRH
70 AVSS
71 PJ0_CSGP3
72 PJ1_CSGP4
73 PJ2
74 PJ3
75 PJ4
76 PJ5
77 PJ6
78 PJ7
79 PA0_IC3
80 PA1_IC2
81 PA2_IC1
DC Voltage Comments (Condition)
3.00
3.23 Synth chip select
3.00
1.48 RX enable
0.01 TX enable
3.23
0 Green LED enable
0 Red LED enable
0
0
2.98 Lock detect from U201-4
3.22 Boot mode enable
3.12
3.23
3.20
3.20
2.91 VOX threshold detect
0.73 RSSI input
0.14
1.62
0 - 3.3 V Volume control wiper
2.48 33% of battery voltage
0
3.20
GND
3.23 Side PTT button
0 External MIC PTT
3.23
3.23
3.23
0
3.23 Bottom option button
3.23 Top option button
0
1.57
3.00
3-11