Garmin GNS 430 - Sidetone; MIC Intercom Test; Receiver Sensitivity; TX Interlock

Page 3-12 400 SERIES MAINTENANCE MANUAL
Rev. C P/N 190-00140-05
Table 3-7. Testing FailuresCOM Board
TEST FAILURE TEST PARAGRAPH RECOMMENDED ACTION
Power Input Check 5.7.2.1 Replace Main Board (see paragraph 4.5.5)
Replace Com Board (see paragraph 4.5.4)
RF Power Out 5.7.2.2 Replace Com Board (see paragraph 4.5.4)
Frequency Stability and
Tolerance
5.7.2.3 Replace Com Board (see paragraph 4.5.4)
Modulation Capability Test 5.7.2.4 Replace Com Board (see paragraph 4.5.4)
Carrier Noise Level 5.7.2.5 Replace Com Board (see paragraph 4.5.4)
Demodulated Audio Distortion 5.7.2.6 Replace Com Board (see paragraph 4.5.4)
Demodulated Audio Response 5.7.2.7 Replace Com Board (see paragraph 4.5.4)
Sidetone 5.7.2.8 Replace Com Board (see paragraph 4.5.4)
Mic Intercom Test 5.7.2.9 Replace Com Board (see paragraph 4.5.4)
Receiver Sensitivity 5.7.2.10 Replace Com Board (see paragraph 4.5.4)
TX Interlock 5.7.2.11 Replace Com Board (see paragraph 4.5.4)
AGC Test 5.7.2.12 Replace Com Board (see paragraph 4.5.4)
Selectivity—25 kHz Mode 5.7.2.13 Replace Com Board (see paragraph 4.5.4)
Selectivity—8.33 kHz Mode 5.7.2.14 Replace Com Board (see paragraph 4.5.4)
Volume Control (Audio Output) 5.7.2.15 Replace Com Board (see paragraph 4.5.4)
Audio Distortion Test 5.7.2.16 Replace Com Board (see paragraph 4.5.4)
Audio Frequency Response 5.7.2.17 Replace Com Board (see paragraph 4.5.4)
Receiver Audio Compressor Test 5.7.2.18 Replace Com Board (see paragraph 4.5.4)
Squelch Test 5.7.2.19 Replace Com Board (see paragraph 4.5.4)
Com Remote Transfer Input 5.7.2.20 Replace Com Board (see paragraph 4.5.4)