[Yaesu] Another Request for Help with FT1000/D

[Vince]

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
>