[TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Aug 2005 12:13:48 -0400
I have a TAG generator you can have for $50.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, August 31, 2005 11:44 AM
Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
> Thanks Jim,
> This problem does look like a EPROM. I am going to try and align the
> tuner.
> Have had no success doing this in the past . I have a Sencore VA62 signal
> generator but do not have a procedure for these type tuners.. I could get
> the Service manual but thought it suggests using a TAG generator which I
> don't have for the alignment. If any one has a easy alignment procedure
> for
> these sets would appreciate it.
> Bruce.
>
> B&T Electronics
> 139 Margaret St
> Sarnia Ontario
> Canada
> N7T 2Y3
> 519 344 1850
>
> ----- Original Message -----
> From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, August 29, 2005 10:34 AM
> Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
>
>
>> 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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