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