03-23-2022, 07:26 AM
Hi Cap'n Clock, 3 good divide and conquer points, break out your DVM.
1. Verify the output of the power supply, both at its output plug and when plugged into the radio. Should be 12V or more. If the power drops to Zero when plugged into the radio and the radio powered on, then C7, C8 or others may be shorted. Remember, this is a Positive Ground Radio.
2. Find C7 and C8, and measure across them individually. C7 should be 12V if on batteries, may be higher if on wall wart power supply. If 0V, then check connections, power switch, etc. Also check for shorts. The voltage across C8 should be at least 1.4V lower than across C7. If the same as C7, check for opens, particularly around the Audio Output Stage.
3. Attempt to inject an audio signal from a cell phone, computer, CD Palyer, etc into the Amp at the middle terminal (wiper) of the volume control. If no joy, troubleshoot the Audio Amp until resolved. If Sound is good, check all before it.
Good Luck,
John, MrFixr55.
1. Verify the output of the power supply, both at its output plug and when plugged into the radio. Should be 12V or more. If the power drops to Zero when plugged into the radio and the radio powered on, then C7, C8 or others may be shorted. Remember, this is a Positive Ground Radio.
2. Find C7 and C8, and measure across them individually. C7 should be 12V if on batteries, may be higher if on wall wart power supply. If 0V, then check connections, power switch, etc. Also check for shorts. The voltage across C8 should be at least 1.4V lower than across C7. If the same as C7, check for opens, particularly around the Audio Output Stage.
3. Attempt to inject an audio signal from a cell phone, computer, CD Palyer, etc into the Amp at the middle terminal (wiper) of the volume control. If no joy, troubleshoot the Audio Amp until resolved. If Sound is good, check all before it.
Good Luck,
John, MrFixr55.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
