[TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
- From: "Bruce Tiedeman" <btied@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 31 Aug 2005 12:51:20 -0400
Thank Jim, Yes it is similar to the VA62 , all I need is the service manual,
apparently it is available on TechAssist. Then brains to use it.
Bruce.
----- Original Message -----
From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, August 31, 2005 12:12 PM
Subject: [TechAssist] Re: RCA CTC177AE Model#G26685 Tuner Problem.
> My Sencore VG91 does the job just fine. It generates all VHF and UHF
> channels one at a time. The TAG generator outputs the channels needed to
> do the alignment. I'm not sure what the VA62 does but if it can generate
> the same channels as the TAG generator then you're all set, assuming you
> have a scope, meter and service manual.
>
> The Old Master Technician
> ********************************
> Since 1972 *
> Jim Myers *
> Telrad Electronics *
> Fort Wayne Indiana *
> ********************************
>
>
> Bruce Tiedeman wrote:
>> 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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