Motorola EP450 - Page 43

November 24, 2003 HKLN4216A
5-12 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals
U401
Microprocessor
46 PH1_PW2 3.00
47 PH0_PW1 3.23 Synth chip select
48 XIRQ 3.00
49 PI7 1.48 RX enable
50 PI6 0.01 TX enable
51 PI5 3.23
52 PI4 0 Green LED enable
53 PI3 0 Red LED enable
54 PI2 0
55 PI1 0
56 PI0 2.98 Lock detect from U201-4
57 MODB_VSTBY 3.22 Boot mode enable
58 MODA_LIR 3.12
59 AVDD 3.23
60 PE7_AN7 3.20
61 PE6_AN6 3.20
62 PE5_AN5 2.91 VOX threshold detect
63 PE4_AN4 0.73 RSSI input
64 PE3_AN3 0.14
65 PE2_AN2 1.62
66 PE1_AN1 0 - 3.3 V Volume control wiper
67 PE0_AN0 2.48 33% of battery voltage
68 VRL 0
69 VRH 3.20
70 AVSS GND
71 PJ0_CSGP3 3.23 Side PTT button
72 PJ1_CSGP4 0 External MIC PTT
73 PJ2 3.23
74 PJ3 3.23
75 PJ4 3.23
76 PJ5 0
77 PJ6 3.23 Bottom option button
78 PJ7 3.23 Top option button
79 PA0_IC3 0
80 PA1_IC2 1.57
81 PA2_IC1 3.00
Table 5-4. Troubleshooting Table for Board and IC Signals (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition)