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Hi all,,
Working on a very nice 101e, unfortunatly , R40 is burnt to a crisp, does any one have ny idea what the cause may be , meter tells me there is a dead short on the output side , 300 volts is on the input . Brian. VK4 PX.
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Check C109 connected to R40 nearby for possible short.
Nestor
VE7RSN
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Thx Nestor ,
Turns out it was c11 dead short, burning out r40.
I am presently working on another 101 , the first one is a 101b, the one I am working on now is a 101e, and I am having problems as the regulator board is not the same as the schematics I have , the 6 volt rail on the VFO is not lighting a 6 volt rail, and falls to o volts on transmit,,the regulator is a pb 1547 or similar number, but different to the 101 b .
Is it possible to,obtain a circuit of this model ,with the different regulator, 101e, there must have been differences in these as they came out , and hard to repair without a circuit, I was trying to see which PIN number is feeding the 6 volt output,,and where does the voltage for this rail,come from, I see 13 .5 volts on I think pin 12 , but there must be a problem some where as no power in the 6 volt rail, it,lites the led and that¡¯s about all, the PNP transistor checks out ok , and seems to,feed into an ic,but with out a circuit im at a loss to know what¡¯s going on, if you have any info ide like to hear back from you.Brian .VK4PX.
On Mon, Apr 28, 2025 at 3:31 PM Nestor Noguera via <nogueras= [email protected]> wrote: Check C109 connected to R40 nearby for possible short.
Nestor
VE7RSN
|
Nestor the board is PB1547 Regulator.
Thx Nestor ,
Turns out it was c11 dead short, burning out r40.
I am presently working on another 101 , the first one is a 101b, the one I am working on now is a 101e, and I am having problems as the regulator board is not the same as the schematics I have , the 6 volt rail on the VFO is not lighting a 6 volt rail, and falls to o volts on transmit,,the regulator is a pb 1547 or similar number, but different to the 101 b .
Is it possible to,obtain a circuit of this model ,with the different regulator, 101e, there must have been differences in these as they came out , and hard to repair without a circuit, I was trying to see which PIN number is feeding the 6 volt output,,and where does the voltage for this rail,come from, I see 13 .5 volts on I think pin 12 , but there must be a problem some where as no power in the 6 volt rail, it,lites the led and that¡¯s about all, the PNP transistor checks out ok , and seems to,feed into an ic,but with out a circuit im at a loss to know what¡¯s going on, if you have any info ide like to hear back from you.Brian .VK4PX. On Mon, Apr 28, 2025 at 3:31 PM Nestor Noguera via <nogueras= [email protected]> wrote: Check C109 connected to R40 nearby for possible short.
Nestor
VE7RSN
|
Hello Brian, The attached schematic contains the PB1547 regulator circuit. Nestor VE7RSN
Nestor the board is PB1547 Regulator. Thx Nestor ,
Turns out it was c11 dead short, burning out r40.
I am presently working on another 101 , the first one is a 101b, the one I am working on now is a 101e, and I am having problems as the regulator board is not the same as the schematics I have , the 6 volt rail on the VFO is not lighting a 6 volt rail, and falls to o volts on transmit,,the regulator is a pb 1547 or similar number, but different to the 101 b .
Is it possible to,obtain a circuit of this model ,with the different regulator, 101e, there must have been differences in these as they came out , and hard to repair without a circuit, I was trying to see which PIN number is feeding the 6 volt output,,and where does the voltage for this rail,come from, I see 13 .5 volts on I think pin 12 , but there must be a problem some where as no power in the 6 volt rail, it,lites the led and that¡¯s about all, the PNP transistor checks out ok , and seems to,feed into an ic,but with out a circuit im at a loss to know what¡¯s going on, if you have any info ide like to hear back from you.Brian .VK4PX. On Mon, Apr 28, 2025 at 3:31 PM Nestor Noguera via <nogueras= [email protected]> wrote: Check C109 connected to R40 nearby for possible short.
Nestor
VE7RSN
|
On Tue, Apr 29, 2025 at 6:22 AM Nestor Noguera via <nogueras= [email protected]> wrote: Hello Brian, The attached schematic contains the PB1547 regulator circuit. Nestor VE7RSN
Nestor the board is PB1547 Regulator. Thx Nestor ,
Turns out it was c11 dead short, burning out r40.
I am presently working on another 101 , the first one is a 101b, the one I am working on now is a 101e, and I am having problems as the regulator board is not the same as the schematics I have , the 6 volt rail on the VFO is not lighting a 6 volt rail, and falls to o volts on transmit,,the regulator is a pb 1547 or similar number, but different to the 101 b .
Is it possible to,obtain a circuit of this model ,with the different regulator, 101e, there must have been differences in these as they came out , and hard to repair without a circuit, I was trying to see which PIN number is feeding the 6 volt output,,and where does the voltage for this rail,come from, I see 13 .5 volts on I think pin 12 , but there must be a problem some where as no power in the 6 volt rail, it,lites the led and that¡¯s about all, the PNP transistor checks out ok , and seems to,feed into an ic,but with out a circuit im at a loss to know what¡¯s going on, if you have any info ide like to hear back from you.Brian .VK4PX. On Mon, Apr 28, 2025 at 3:31 PM Nestor Noguera via <nogueras= [email protected]> wrote: Check C109 connected to R40 nearby for possible short.
Nestor
VE7RSN
|
Nestor,,thanks so much, turns out the channel,switch was dirty ,,the one next to ic/alc/ switch, working of now .thx again 4 your help.Brian.
On Tue, Apr 29, 2025 at 6:22 AM Nestor Noguera via <nogueras= [email protected]> wrote: Hello Brian, The attached schematic contains the PB1547 regulator circuit. Nestor VE7RSN
Nestor the board is PB1547 Regulator. Thx Nestor ,
Turns out it was c11 dead short, burning out r40.
I am presently working on another 101 , the first one is a 101b, the one I am working on now is a 101e, and I am having problems as the regulator board is not the same as the schematics I have , the 6 volt rail on the VFO is not lighting a 6 volt rail, and falls to o volts on transmit,,the regulator is a pb 1547 or similar number, but different to the 101 b .
Is it possible to,obtain a circuit of this model ,with the different regulator, 101e, there must have been differences in these as they came out , and hard to repair without a circuit, I was trying to see which PIN number is feeding the 6 volt output,,and where does the voltage for this rail,come from, I see 13 .5 volts on I think pin 12 , but there must be a problem some where as no power in the 6 volt rail, it,lites the led and that¡¯s about all, the PNP transistor checks out ok , and seems to,feed into an ic,but with out a circuit im at a loss to know what¡¯s going on, if you have any info ide like to hear back from you.Brian .VK4PX. On Mon, Apr 28, 2025 at 3:31 PM Nestor Noguera via <nogueras= [email protected]> wrote: Check C109 connected to R40 nearby for possible short.
Nestor
VE7RSN
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Cusso550
