Motorola EP450

November 24, 2003 HKLN4216A
5-14 VHF Troubleshooting Tables: Troubleshooting Table for Board and IC Signals
U404
Flash ROM
10 A16 3.17
11 A15 0.30
12 A12 0.22
13 A7 3.03
14 A6 3.08
15 A5 3.06
16 A4 0
17 A3 0.24
18 A2 3.08
19 A1 3.05
20 A0 3.05
21 D0 0.69
22 D1 0.94
23 D2 1.08
24 GND GND
25 D3 0.78
26 D4 0.59
27 D5 0.66
28 D6 0.67
29 D7 0.75
30 EN_CE 3.01 From U401-38
31 A10 0.16
32 EN_OE 0 From U401-86
U451
ASFIC_CMP
1 VDD for analog circuits 3.00
2 DISC audio input 1.34 From U510
3 Ground for analog circuits GND
4 DACU output 0
5 DACR output 0
6 DACG output 2.38 (typ) Power set (TX mode)
7 VOX peak detector output 2.91
8 PLCAP for DC integrator 0.40
9 SQIN 0.01
10 Universal audio input/output 0
11 VDD for DACs 4.95
12 SQCAP 0
13 GCB2 general purpose output 0 Audio PA_EN (unsquelched)
Table 5-4. Troubleshooting Table for Board and IC Signals (Continued)
IC Designator Pin Pin Function DC Voltage Comments (Condition)