[TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
- From: Warren <warrenca@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 07 Mar 2005 09:37:59 -0500
Damon
No I took it out and used my ol faithfull cap tester on it. (Heathkit)
This tester I trust with few exceptions.
But I will try to test the 143 V line today with the scope.
Thanks All, for your help and comments so far.
Warren C
damon101@xxxxxxxxxxxxxx wrote:
>Hey! I just saw you measured your 143V supply cap and it measured OK!!
>How did you measure it... and please don't say you ESR'd it??
>
>Damon Brunger
>Telrad Electronics
>Fort Wayne IN
>----- Original Message -----
>From: "Warren" <warrenca@xxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Sunday, March 06, 2005 11:23 PM
>Subject: [TechAssist] Re: Projo RCA CTC169 Dead with wrong standby voltages
>
>
>
>
>>Bill
>>Sorry if I did not make myself clear on the 143V standby Voltage
>>I do not have a readable 143 I think that it's much higher even though
>>I can't read it.
>>Please reread my other posts Thanks
>>WC
>>Bill Grabowski wrote:
>>
>>
>>
>>>From my past experience the 14.2 at the 15volt CR4118 is normal and the
>>>the regulated B+ at 143volts is also acceptable. See if you get a 26
>>>volt reading from the scan derived circuit. Audio output might be
>>>shorted causing shutdown. Also diode,cap,or HOT in Horiz section. Just
>>>my 2 cents!!
>>>
>>>Bill Grabowski
>>>Triangle Appliance
>>>Kenosha, WI 53142
>>>
>>>Warren wrote:
>>>
>>>
>>>
>>>
>>>
>>>>I would like to know :
>>>>If there is a problem in the horiz section or elsewhere will it cause
>>>>the P.S. to give wrong standby voltages when the set is off
>>>>and won't turn on??.
>>>>I must establish if the problem is in the PS or not.
>>>>When you read the hints on the fishe(RCA) it says that, if you have
>>>>the 5 V standby then the problem is probably elsewhere.
>>>>I have the 5V but the 15V standby is at 14.2 and the 143 is high and my
>>>>meter is having trouble reading the voltage.
>>>>Changed the meter and the same thing.
>>>>3 Volts also between the cathodes of two diodes at PS (#'s escape me
>>>>right now) is too high .All say that this should be <1V when in standby
>>>>If you read my first posts you will see that I've changed many of the
>>>>usual parts.
>>>>I must establish if the PS should give proper voltages on it's own when
>>>>plugged into the wall and possible problems elsewhere???
>>>>Thanks
>>>>Warren C
>>>>
>>>>Bill Grabowski wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Is your Horiz output circuit okay. There are 5 shutdown circuits
>>>>>employed on these CTC169's
>>>>>
>>>>>Pete wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>I always replace the caps with the same value on the set, The standby
>>>>>>
>>>>>>
>B+
>
>
>>>>>>must be 138-140V, running voltage 143-145V, .
>>>>>>Remove and clean the running voltage control, inside the black plastic
>>>>>>cover.
>>>>>>check audio output chips removing the plug in the audio board.
>>>>>>Good luck
>>>>>>
>>>>>>pete
>>>>>>
>>>>>>Perdomo TV, Inc. Since 1972
>>>>>>MIami, Fl.
>>>>>>
>>>>>>
>>>>>>From: Warren" <warrenca@xxxxxxxxx>
>>>>>>To: <techassist@xxxxxxxxxxxxx>
>>>>>>Sent: Friday, March 04, 2005 10:47 PM
>>>>>>Subject: [TechAssist] Projo RCA CTC169 Dead with wrong standby
>>>>>>
>>>>>>
>voltages
>
>
>>>>>>Hi all!
>>>>>>I will list the work so far:
>>>>>>15 V standby =3D 14.2
>>>>>>5V standby =3D4.9V
>>>>>>Raw B+=3D151V
>>>>>>Regulated B+ is too high I think ...The meter does not like the signal
>>>>>>at TP4101 some times 197V sometimes 1.97V?? Should the Reg B+ be 143V
>>>>>>before turn on????
>>>>>>=A0=A0From cathode of CR4106 to Cathode of CR4101 first I had 2
>>>>>>Volts.... Now
>>>>>>after changing diodes I get 3 volts???
>>>>>>Should be under 1 Volt.
>>>>>>Installed a startup kit from Global Q4101, U4101, C4102, C4118, C4108
>>>>>>(47uf) which also was a 47UF before.
>>>>>>My schematic shows 39uf ?? does this make a difference?? Caps were
>>>>>>installed first with Q4101 , IC =A0 U4101 was installed
>>>>>>afterwards.
>>>>>>Also changed C4104(15uf) with also no change.
>>>>>>I also tried to isolate the H out (curiosity) - no change
>>>>>>I've read many tips but most of these point to the parts that I've
>>>>>>already changed.
>>>>>>Can someone brush up my 169 skills.
>>>>>>What am I missing??
>>>>>>Does anyone have a troubleshooting flow chart for the 169?? This would
>>>>>>help.
>>>>>>BTW when you push the on button you can see the front led give a
>>>>>>
>>>>>>
>slight
>
>
>>>>>>single blink.
>>>>>>TIA all !
>>>>>>All tips and comments welcome.
>>>>>>------------------------------------------
>>>>>>
>>>>>>
>>>>>>
>>>>>------------------------------------------------------------------------
>>>>>
>>>>>
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>>>>>
>>>>>
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