[TenTec] Omni VI Logic Board

[Bob McGraw]

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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