Troubleshooting Table For Board And Ic Signals (Uhf1); Table 12-4. Troubleshooting Table For Board And Ic Signals (Uhf1) - Motorola EP350 Service Manual

12-4

12.4 Troubleshooting Table for Board and IC Signals (UHF1)

Table 12-4. Troubleshooting Table for Board and IC Signals (UHF1)

IC Designator
U201(IF IC)
U701(PLL IC)
U601
(Audio Amp.)
U103
UHF1 Troubleshooting Tables: Troubleshooting Table for Board and IC Signals (UHF1)
Pin Pin Function
1 Osc1
2 Osc2
4 VCC
9 Audio frequency
12 RSSI out
13 N–DET(BUSY)
15 GND
16 RF input
1 Reference OSC input
4 VCC
6 GND
7 XF IN
8 F IN
12 Power save
13 GND
14 LD_out
15 @P
16 @R
1 Mode (Mute con)
2 SVR
3 IN+
4 IN-
5 OUT-
6 VCC
7 GND
8 OUT+
1 IN+
DC Voltage (V) Comments (Condition)
3.9 44.645 MHz input
3.3
4.7
1.2
Approximately 1 At –47dBm(with conducted)
Low At busy
0
1 45.1 MHz input
1.4 12.8 MHz input
3.3
0
2.2
2.2
High
0
High If pll unlock is low
2.4
Low
0
3.8
3.8
3.8
3.8
7.5 This voltage depends on Battery
0
3.8
1.6