🚀 go-pugleaf

On 11 Jul 2005 16:54:35 -0700, "alitonto" <alitonto@hotmail.com>
wrote:

>I am not sure how to check the IF section because I cannot get a
>reading with my digital meter on the tuner's IF pin.  Is it possible to
>measure some DC volts there or only frequency can be measured?
>I have checked and replaced marginal caps so far.
>Ali.
>
The 2 DC voltage checks I can think of are the AFT (* VDC or so, if
memory serves) and the B+ (33 VDC).

I've seen weak tuners that couldn't produce a good image for cable
signal levels, but a video game deck was okay. Perhaps the test signal
from your VCR is a stronger signal, and the tuner is marginal. As a
test (not a repair) try an RF amplifier.

Tom

>b wrote:
>> alitonto ha escrito:
>> > Teak TV ct-M687;HDTV   Any advice please.
>> > All channels can be somewhat tuned but none of them look good.
>> > Picture is distorted/wavy and the sound cuts in and out for about 5
>> > minutes from when TV is first turned on.
>> >
>> > I have tested with a VCR and cannot receive stations from the RF but
>> > this is confusing me: I switch the VCR to test and can get the 2
>> > vertical white lines by tuning the TV to channel 3 (via RF) but cannot
>> > receive anything.
>> > However I do get perfect picture and sound via the scart connector.
>> >
>> > So far I have resoldered etc.; I have B+ at 12.11v and various voltages
>> > on other pins at the tuner but no reading on the IF pin.
>> >
>> > I would appreciate any thoughts on narrowing down the problem.
>> > Thanks
>> > ALI
>>
>> sounds like you need to check the I.F. section for bad caps and/or  the
>> aft may need a tweak.
>> B.