[TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 29 Aug 2005 09:34:25 -0500
Replacing the EEprom and just plugging in random numbers does not always
work, you may have to go through the tuner alignment procedure in the
service manual to get it right, you do have to do it from start to
finish, not just till you see a picture on the channel it is tuned to.
The Old Master Technician
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
John Conti wrote:
> Tuning voltage is developed at pin 7 of the flyback by cr4113,c4130,cr4108.
> This can be checked at the cathode of cr4109 (a 33vzener)at the top of the
> pcb near the right front edge of the tuner wrap. alsoalso at r7411 a 1 meg
> resistor at collector of q7401. Lighting often damages the zener. also
> knownof instances in which r7411 opened. Don,t know if thiswill help any but
> worth a look at.
>
> John
> Conti,sTV
> Texas
>
>
>
>>From: "Damon" <damoneb@xxxxxxxxxxx>
>>Reply-To: techassist@xxxxxxxxxxxxx
>>To: <techassist@xxxxxxxxxxxxx>
>>Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
>>Date: Mon, 29 Aug 2005 07:12:29 -0500
>>
>>I wonder if this is the chassis where the bad SMD cap causes the AFT pulse
>>to the micro to disappear?
>>
>>Damon B
>>Telrad Electronics
>>Fort Wayne IN
>>----- Original Message -----
>>From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Saturday, August 27, 2005 3:23 PM
>>Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
>>
>>
>>
>>>Ed, thanks for looking, been off for a couple days. I did get it. Still
>>>working on this tough one. All voltages working good according to
>>
>>trouble
>>
>>>guide, looks like off frequency just enough, no pix sound only. I have
>>>another chassis am running some voltage checks to compare.
>>>Bruce.
>>>
>>>
>>>----- Original Message -----
>>>From: "Ed Gaidies" <teltek3@xxxxxxxxxxxx>
>>>To: <techassist@xxxxxxxxxxxxx>
>>>Sent: Sunday, August 21, 2005 6:49 PM
>>>Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
>>>
>>>
>>>
>>>>Bruce;
>>>>If you can't get it over the weekend, remind me Tuesday morning, I
>>>>may have it.
>>>>
>>>>-Ed-
>>>>Tel-Tek Electronics
>>>>Ontario-Canada
>>>>teltek3@xxxxxxxxxxxx
>>>>
>>>>teltek@xxxxxxxxx
>>>>
>>>>"Learn from past mistakes.Or you are bound to repeat them"
>>>>
>>>>On Aug 21, 2005, at 4:40 PM, Bruce Tiedeman wrote:
>>>>
>>>>
>>>>>Yes AL, Still need that file. I have written a similar model EPROM
>>>>>file to
>>>>>the chip no luck. The parameters are there but still off frequency.
>>>>>I have
>>>>>tech tips from Gary to help in trouble shooting.
>>>>>Bruce.
>>>>>
>>>>>
>>>>>----- Original Message -----
>>>>>From: "Al Gutz" <alg@xxxxxxxxxxx>
>>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>>Sent: Saturday, August 20, 2005 10:21 PM
>>>>>Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>Bruce
>>>>>> I have the 218403 file if you still need it.
>>>>>>
>>>>>>Gary
>>>>>> Did I not send you the RCA eeproms I had, this one should be
>>
>>there.
>>
>>>>>>Al G
>>>>>>
>>>>>>Gary McCartney wrote:
>>>>>>
>>>>>>
>>>>>>>Bruce, that is eeprom # 218403. I don't have the file for that
>>>>>>>but I do
>>>>>>>have one for 218402 which is for CTC177AF.
>>>>>>>
>>>>>>>I have some tuner tips which I'll look for and send to you.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>Gary McCartney
>>>>>>>
>>>>>>>McCartney Electronics
>>>>>>>Guelph Ontario Canada
>>>>>>>Est. 1984
>>>>>>>email: gary (at) number63.ca
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>Bruce Tiedeman wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Looking for EPROM data for the CTC177AE chassis if some has it.
>>>>>>>>(Pony
>>>>>>>>program .ep2 format). The lower channels have audio only and a off
>>>>>>>>frequency
>>>>>>>>display.
>>>>>>>>The tuner voltages check good on the FET transistors and the
>>>>>>>>IC's. I
>>>>>>>>don't
>>>>>>>>have a complete trouble shooting guide for this tuner. I can not
>>>>>>>>pick up
>>>>>>>>a
>>>>>>>>tuned signal with my scope, but the voltages with in the tuner
>>>>>>>>check
>>>>>>>>good.
>>>>>>>>Some else has done the tuner wrap on this chassis but customer
>>>>>>>>is vague
>>>>>>>>about the repair.
>>>>>>>>
>>>>>>>>thanks for any help,
>>>>>>>>Bruce.
>>>>>>>>
>>>>>>>>B&T Electronics
>>>>>>>>139 Margaret St
>>>>>>>>Sarnia Ontario
>>>>>>>>Canada
>>>>>>>>N7T 2Y3
>>>>>>>>519 344 1850
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>
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