As always tks vm your sage advice Bob and yes I do suspect electrolytic
failure of a kind but where is another question as it only seems to
affect the receive audio side as am assuming the O6 functions normally
otherwise ie the transmit output is fully functional..
To elaborate on my problem this youtube video and various comments
including Z3 replacement from YO3IUL is better than 1000 words.
https://www.youtube.com/watch?v=6RnAC2PuuI8
73
Malcolm
On 8/27/2020 5:52 PM, Bob McGraw wrote:
There is a RC timing circuit on the microprocessor RESET line. It is
common for the value of the C electrolytic to decrease with age. Thus
the original RC time constant value has changed. That can be the
cause of the MP "not coming to life". Change the C to a new cap,
typically 4.4 uF. I prefer to use a Tantalum type cap.
Also, take time to clean all of the cable connectors, male and female
pins. Use a Q-Tip cotton swab moistened with contact cleaner.
Scrub the male pins and then exercise them on the female pins.
NEVER SPRAY ANYTHING INTO THE RADIO
73
Bob, K4TAX
On 8/27/2020 9:30 AM, Malcolm McLeman wrote:
My Omni VI audio doesn't spark into life for quite a considerable
time and when it does it is usually preceded by unusual
old-fashioned style "motor-boating" noise.
Have read the problem is Z3 zener diode on the logic board.
Has anyone had/resolved this problem by changing Z3?
73
Malcolm F5VBU
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