What B1 voltage for TV - Akai CT-2104A

[Ian McOwan]

Hi all,

I have a circuit for an Akai TV CT-2104A but amazingly it doesn't show the
voltage for B1!

The collector of Horiz Output is marked at 112V so it's around that mark,
but it would be nice to know the proper voltage.

Thanks, Ian.

 

[Eric]

B+ should be 107 Volts
at test point TP901
Adjust VR901
It has a siemans type power supply,
If the B+ is higher than 107 Volts replace the 47ľfd 50V electrolytic in the
primary of the power supply going to the base of the chopper transistor,
check the ESR if it might be higher (and change it anyway).

this information is available on Internet.



"Ian McOwan" <imcowan@ihug.com.au> wrote in message
news:bkop2p$5of$1@lust.ihug.co.nz...
: Hi all,
:
: I have a circuit for an Akai TV CT-2104A but amazingly it doesn't show the
: voltage for B1!
:
: The collector of Horiz Output is marked at 112V so it's around that mark,
: but it would be nice to know the proper voltage.
:
: Thanks, Ian.
:
:

 

[Ian McOwan]

Thank you Eric!

By the way, I noted that you said the information was available on the
Internet. Although in my searches I found many references to Akai, I didn't
get much in the way of technical information - mind if I ask where you
typically look?

Thanks, Ian.

"Eric" <some1@clare.co.nz> wrote in message news:3f6ff524@clear.net.nz...

B+ should be 107 Volts
at test point TP901
Adjust VR901
It has a siemans type power supply,
If the B+ is higher than 107 Volts replace the 47ľfd 50V electrolytic in
the
primary of the power supply going to the base of the chopper transistor,
check the ESR if it might be higher (and change it anyway).

this information is available on Internet.



"Ian McOwan" <imcowan@ihug.com.au> wrote in message
news:bkop2p$5of$1@lust.ihug.co.nz...
: Hi all,
:
: I have a circuit for an Akai TV CT-2104A but amazingly it doesn't show
the
: voltage for B1!
:
: The collector of Horiz Output is marked at 112V so it's around that
mark,
: but it would be nice to know the proper voltage.
:
: Thanks, Ian.
:
:

 

[Eric]

Hi Ian
Just after I made the posting I realized I told a fib to you.
The correct information is 1/2 the information is there, (not the part about
the 47ľFd electrolytic)

put [ct2104] into google

result 27 0f 488
homepages.paradise.net.nz/erichard/s/list_tv.html
CT 2104=CT2107 (1404) 107v VR901 TP901


CT 2104=CT2107 (1404) means that is the same circuit as the CT1404 (&
basicly same TV as CT2107)



or how about [monitor tests]
result number 1 from 2,750,000
www.oh-bugger.net.nz/
not bad from useless <meta> words (I think from memory there is no meta
words used.


"Ian McOwan" <imcowan@ihug.com.au> wrote in message
news:bkr1cd$veg$1@lust.ihug.co.nz...
: Thank you Eric!
:
: By the way, I noted that you said the information was available on the
: Internet. Although in my searches I found many references to Akai, I
didn't
: get much in the way of technical information - mind if I ask where you
: typically look?
:
: Thanks, Ian.
:
: "Eric" <some1@clare.co.nz> wrote in message news:3f6ff524@clear.net.nz...
: > B+ should be 107 Volts
: > at test point TP901
: > Adjust VR901
: > It has a siemans type power supply,
: > If the B+ is higher than 107 Volts replace the 47ľfd 50V electrolytic in
: the
: > primary of the power supply going to the base of the chopper transistor,
: > check the ESR if it might be higher (and change it anyway).
: >
: > this information is available on Internet.
: >
: >
: >
: > "Ian McOwan" <imcowan@ihug.com.au> wrote in message
: > news:bkop2p$5of$1@lust.ihug.co.nz...
: > : Hi all,
: > :
: > : I have a circuit for an Akai TV CT-2104A but amazingly it doesn't show
: the
: > : voltage for B1!
: > :
: > : The collector of Horiz Output is marked at 112V so it's around that
: mark,
: > : but it would be nice to know the proper voltage.
: > :
: > : Thanks, Ian.
: > :
: > :
: >
: >
:
: