A Southern marine Research Sea Lab 9000 Marine FM Transceiver that came in totally dead after being hooked up to reverse polarity power. After a quick visual inspection I found 2 transistors that had been damaged due to the reverse polarity. After transistor replacement it works great once again.
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00:00 Intro and first look
00:47 The schematic and parts list
01:41 Testing the AC and DC adaptors
002:42 Testing the (over 10 year old) battery
03:14 The board view and a damaged capacitor
03:39 That is the problem
04:25 The blown transistors
05:04 Testing the diodes in circuit
05:51 I don't have originals, but I have these
06:38 Transmit and receive tests
07:28 Reversing the DC cord polarity
07:55 Final thoughts/Closing words
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