Hardware modifications

There are 2 things to do:

  1. Solder a 100k THT resistor in parallel with R552
  2. Move jumper JU551 to position A

Optionally, you can cut open pin 4 of the power amplifier IC. This allows an access to the internal speaker via pins 1 and 15 on the back of the radio. JU551 jumper is visible on the left side, between an electrolytic capacitor and 2 (MKP?) blue ones.

  • gm300.txt
  • Last modified: 2021/06/24 08:54
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