|
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
|
Will this one work?
Bob? W4JFA
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
|
Hi Bob,
Thanks for that. "The product must be a multiple of 761" Hi.
?I might try our local Ham Radio dealerships they may sell me one? but it is quite an old radio by todays standards.
But thanks for trying.
73,
Richard G0ILN.
On 09 July 2023 at 11:51 Bob <W4JFABob@...> wrote:
Will this one work?
Bob? W4JFA
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
?
?
?
|
Now I see you have to order 761 of them!
Will this one work?
Bob? W4JFA
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
|
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some: Here is a mod specific to that regulator and radio that you might look into -- Jeff - NZ2S
|
Hi Richard, ? A quick Google search brought up Mouser as having plenty in stock. ? See ? 73….Eric VK2VE. ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of R.Putnam via groups.io
Sent: Sunday, July 9, 2023 8:06 PM
To: [email protected]
Subject: [Kenwood-Amateur-Radio] hARD TO FIND COMPONENTS? hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
|
I found this as a possible substitution. You'll have to check datasheets.
Bob? W4JFA
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
|
Hi Richard, ? A quick Google search brought up Mouser as having plenty in stock. You can order in 1 off quantities and you could buy 10 for about 4 quid. ? See ? 73….Eric VK2VE. ?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]> On Behalf Of R.Putnam via groups.io
Sent: Sunday, July 9, 2023 8:06 PM
To: [email protected]
Subject: [Kenwood-Amateur-Radio] hARD TO FIND COMPONENTS? hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
|
Hi Eric,
thanks for looking for me. The Regulator pictured is only three pin my one is five pin but you are right I can buy just the one.
73,
Richard G0ILN.
On 09 July 2023 at 16:01 Eric van de Weyer <groups.io@...> wrote:
Hi Richard,
?
A quick Google search brought up Mouser as having plenty in stock. You can order in 1 off quantities and you could buy 10 for about 4 quid.
?
See
?
73….Eric VK2VE.
?
?
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
?
?
|
hi Bob,
That looks interesting. it might take a day or two to check it out. I will get back to you and let you know how I get on.
73
Richard
On 10 July 2023 at 00:04 Bob <W4JFABob@...> wrote:
I found this as a possible substitution. You'll have to check datasheets.
Bob? W4JFA
hi?
I have a kenwood TM-255 two metre multi-mode. It will not switch on.? I have traced the fault to a regulator L78LR05B-FA. Farnell can supply them but only in large quantities
RS does not seem to stock the part.
has anyone any idea where I might get such a regulator. I have trawled the internet without any luck.
Richard G0ILN.
?
?
?
|
Hi Jeff,
Many thanks for the work you have put in to help me out.
The get around seems to be the best bet.
The problem as explained in the write up is exactly what my problem is. so I will try the capacitor mod.
I wish now I hadn't taken the old regulator off the board. I hope I haven't damaged it!
Thanks again,
Richard
On 09 July 2023 at 16:01 JeffBanke <jeffbanke@...> wrote:
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some:
Here is a mod specific to that regulator and radio that you might look into
--
Jeff - NZ2S
?
|
Glad to help, and good luck with it!
Jeff - NZ2S
On Mon, Jul 10, 2023 at 3:02?AM Richard Putnam < kairos1@...> wrote:
Hi Jeff,
Many thanks for the work you have put in to help me out.
The get around seems to be the best bet.
The problem as explained in the write up is exactly what my problem is. so I will try the capacitor mod.
I wish now I hadn't taken the old regulator off the board. I hope I haven't damaged it!
Thanks again,
Richard
On 09 July 2023 at 16:01 JeffBanke <jeffbanke@...> wrote:
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some:
Here is a mod specific to that regulator and radio that you might look into
--
Jeff - NZ2S
?
--
Jeff - NZ2S
|
So it is a low current 7805 surface mount with a Reset pin. Does the radio actually use the reset pin?
|
Hi ,
Just an update on my Kenwood TM255 2Mtr multi-mode.
I could not get hold of the Regulator chip L78LR05-FA. So I used the get-around suggested by Jeff NZ2S.? I have never tried to solder SMD parts before . I had to resolder the regulator as I had removed it thinking I could buy a new one!
I found a new 22uF? Tantal (Reccomended was 5-15uF). In my spares and fitted it. WOW it worked to my surprise!
So thank you? Jeff,Bob ,Eric and any one I have missed out.
73
Richard G0ILN
On 10 July 2023 at 13:16 JeffBanke <jeffbanke@...> wrote:
Glad to help, and good luck with it!
Jeff - NZ2S
On Mon, Jul 10, 2023 at 3:02?AM Richard Putnam < kairos1@...> wrote:
Hi Jeff,
Many thanks for the work you have put in to help me out.
The get around seems to be the best bet.
The problem as explained in the write up is exactly what my problem is. so I will try the capacitor mod.
I wish now I hadn't taken the old regulator off the board. I hope I haven't damaged it!
Thanks again,
Richard
On 09 July 2023 at 16:01 JeffBanke <jeffbanke@...> wrote:
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some:
Here is a mod specific to that regulator and radio that you might look into
--
Jeff - NZ2S
?
--
Jeff - NZ2S
?
|
You are most welcome Richard, glad to be able to help !
--
Jeff - NZ2S
|
If I understand correctly, the problem was a capacitor, not the regulator IC? Bob W4JFA?
Hi ,
Just an update on my Kenwood TM255 2Mtr multi-mode.
I could not get hold of the Regulator chip L78LR05-FA. So I used the get-around suggested by Jeff NZ2S.? I have never tried to solder SMD parts before . I had to resolder the regulator as I had removed it thinking I could buy a new one!
I found a new 22uF? Tantal (Reccomended was 5-15uF). In my spares and fitted it. WOW it worked to my surprise!
So thank you? Jeff,Bob ,Eric and any one I have missed out.
73
Richard G0ILN
On 10 July 2023 at 13:16 JeffBanke <jeffbanke@...> wrote:
Glad to help, and good luck with it!
Jeff - NZ2S
On Mon, Jul 10, 2023 at 3:02?AM Richard Putnam < kairos1@...> wrote:
Hi Jeff,
Many thanks for the work you have put in to help me out.
The get around seems to be the best bet.
The problem as explained in the write up is exactly what my problem is. so I will try the capacitor mod.
I wish now I hadn't taken the old regulator off the board. I hope I haven't damaged it!
Thanks again,
Richard
On 09 July 2023 at 16:01 JeffBanke <jeffbanke@...> wrote:
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some:
Here is a mod specific to that regulator and radio that you might look into
--
Jeff - NZ2S
?
--
Jeff - NZ2S
?
|
Hi Bob,
Thanks for the reply .The falt is within the Regulator. Jeff NZ2S sent me a "Mod Sheet" The Mod was written by DL2CE.
The regulator? "will only turn on when cold? the problem is probably caused by self oscillationinternal within? the chip"
?Changing the the capacitance of C6. Cures the problem!
Here is the link to the Mod.??? ??
Hope this helps,
73,
Richard G0ILN
On 19 July 2023 at 15:13 Bob <W4JFABob@...> wrote:
If I understand correctly, the problem was a capacitor, not the regulator IC?
Bob W4JFA?
Hi ,
Just an update on my Kenwood TM255 2Mtr multi-mode.
I could not get hold of the Regulator chip L78LR05-FA. So I used the get-around suggested by Jeff NZ2S.? I have never tried to solder SMD parts before . I had to resolder the regulator as I had removed it thinking I could buy a new one!
I found a new 22uF? Tantal (Reccomended was 5-15uF). In my spares and fitted it. WOW it worked to my surprise!
So thank you? Jeff,Bob ,Eric and any one I have missed out.
73
Richard G0ILN
On 10 July 2023 at 13:16 JeffBanke <jeffbanke@...> wrote:
Glad to help, and good luck with it!
Jeff - NZ2S
On Mon, Jul 10, 2023 at 3:02?AM Richard Putnam < kairos1@...> wrote:
Hi Jeff,
Many thanks for the work you have put in to help me out.
The get around seems to be the best bet.
The problem as explained in the write up is exactly what my problem is. so I will try the capacitor mod.
I wish now I hadn't taken the old regulator off the board. I hope I haven't damaged it!
Thanks again,
Richard
On 09 July 2023 at 16:01 JeffBanke <jeffbanke@...> wrote:
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some:
Here is a mod specific to that regulator and radio that you might look into
--
Jeff - NZ2S
?
--
Jeff - NZ2S
?
?
?
?
|
Interesting. Thanks for?the info. Always more to learn. 73, Bob W4JFA?
Hi Bob,
Thanks for the reply .The falt is within the Regulator. Jeff NZ2S sent me a "Mod Sheet" The Mod was written by DL2CE.
The regulator? "will only turn on when cold? the problem is probably caused by self oscillationinternal within? the chip"
?Changing the the capacitance of C6. Cures the problem!
Here is the link to the Mod.??? ??
Hope this helps,
73,
Richard G0ILN
On 19 July 2023 at 15:13 Bob <W4JFABob@...> wrote:
If I understand correctly, the problem was a capacitor, not the regulator IC?
Bob W4JFA?
Hi ,
Just an update on my Kenwood TM255 2Mtr multi-mode.
I could not get hold of the Regulator chip L78LR05-FA. So I used the get-around suggested by Jeff NZ2S.? I have never tried to solder SMD parts before . I had to resolder the regulator as I had removed it thinking I could buy a new one!
I found a new 22uF? Tantal (Reccomended was 5-15uF). In my spares and fitted it. WOW it worked to my surprise!
So thank you? Jeff,Bob ,Eric and any one I have missed out.
73
Richard G0ILN
On 10 July 2023 at 13:16 JeffBanke <jeffbanke@...> wrote:
Glad to help, and good luck with it!
Jeff - NZ2S
On Mon, Jul 10, 2023 at 3:02?AM Richard Putnam < kairos1@...> wrote:
Hi Jeff,
Many thanks for the work you have put in to help me out.
The get around seems to be the best bet.
The problem as explained in the write up is exactly what my problem is. so I will try the capacitor mod.
I wish now I hadn't taken the old regulator off the board. I hope I haven't damaged it!
Thanks again,
Richard
On 09 July 2023 at 16:01 JeffBanke <jeffbanke@...> wrote:
Digikey has alternative names for the device
| ATTRIBUTE |
DESCRIPTION |
| Other Names |
ONSONSL78LR05B-FA-E
2156-L78LR05B-FA-E
|
These folks seem to have some:
Here is a mod specific to that regulator and radio that you might look into
--
Jeff - NZ2S
?
--
Jeff - NZ2S
?
?
?
?
|
Bob
JeffBanke