The circuit points referenced are located on the PS (regulator) Unit, which
is easily accessed when the top cover is removed from the radio.
73, de ~ Vince ~
Vince wrote:
> Help is requested from anyone that has a working FT1000/D radio
> available and is willing to remove the top cover and then make several
> resistance measurements.
>
> I have replaced the blown D9301 rectifier in my FT1000/D radio. Since I
> do not know for certain why this component failed (one diode section
> shorted) I could use some resistance measurement reference data. This
> reference data is desirable prior to power application to the radio
> again for fear of blowing the same component.
>
> I would appreciate knowing the resistance measured at the following
> circuit points:
>
> * REMOVE AC POWER from your RADIO *
>
> [1] Between J7601 {RED from D9301(+)} and J7602 {BLUE from D9301(-)}.
>
> [2] Between J7605 {RED 31.5Vdc Output} and J7606 {BLACK at GND}.
> [3] Between J7602 {BLUE from D9301(-)} and J7606 {BLACK at GND}.
>
> There are two situations for measurements to be made. Please do the
> following [A- partially isolated] and then do [B- wiring reconnected].
>
> [A- partially isolated] At the PS (Regulator) Unit, disconnect both
> the RED conductor ( that connects from D9301(+) ) and the BLUE
> conductor ( that connects from D9301(-) ) from J7601 and J7602,
> respectively. Then make the following measurements:
>
> [1] Measure the resistance between J7601 {RED} and J7602 {BLUE}
> [1a] With meter + lead at J7601: RESULT:
> [1b] With meter - lead at J7601: RESULT:
>
> [2] Measure the resistance between J7605 {RED} and J7606
> {BLACK}
> [2a] With meter + lead at J7605: RESULT:
> [2b] With meter - lead at J7605: RESULT:
>
> [3] Measure the resistance between J7602 {BLUE} and J7606
> {BLACK}.
> [3a] With meter + lead at J7602: RESULT:
> [3b] With meter - lead at J7602: RESULT:
>
> The circuit points to be measured in [B] below are the same as in [A]
> above, but with the wiring reconnected.
>
> [B- wiring reconnected] Reconnect both the RED conductor ( that
> connects from D9301(+) ) and the BLUE conductor ( that connects from
> D9301(-) ) from J7601 and J7602, respectively, at the PS (Regulator)
> Unit. Then make the following measurements:
>
> [4] Measure the resistance between J7601 {RED} and J7602 {BLUE}
> [4a] With meter + lead at J7601: RESULT:
> [4b] With meter - lead at J7601: RESULT:
>
> [5] Measure the resistance between J7605 {RED} and J7606
> {BLACK}
> [5a] With meter + lead at J7605: RESULT:
> [5b] With meter - lead at J7605: RESULT:
>
> [6] Measure the resistance between J7602 {BLUE} and J7606
> {BLACK}.
> [6a] With meter + lead at J7602: RESULT:
> [6b] With meter - lead at J7602: RESULT:
>
> Please advise me of your results for each of the twelve measurements.
>
> Having this reference data available could allow me to avoid damage to
> the expensive rectifier diode, D9301, component that I have just
> replaced. Thank you very much.
>
> 73, de ~ Vince ~
> WA2RSX IOTA NA-026
>
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