[TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
- From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Aug 2005 11:44:25 -0400
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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