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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Emerson TV ?
I have just been given an Emerson/Orion 1995 model TC1375A color tv.
The power relay clicks on and off from the power switch, everything else is totally quiet. There is +150 or so volts at various points on the chassis when the power is on, but that is as far as I have gone so far. Does anyone have any experience with this chassis? If so, what should I be looking for? Also, do you think it is worth spending $10 or so for the schematic, considering the age of the set. I got it second hand so I have no idea how it was performing before it died, I could do an emission check on each of the 3 CRT guns by digging out an antique CRT rejuvenator/tester if I can find it. Any reasonable/lucid suggestions welcomed. H. R.(Bob) Hofmann |
#2
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Emerson TV ?
You will need a scope. Check to see if there are horizontal drive pulses
reaching the base of the horizontal output transistor. At least you will know if the horizontal scan generator is working. This will indicate that there is an easier chance to service the horizontal output stage to have high voltage. The very first thing is to verify that all the voltages are in correct spec from the main power supply. This is most important. Simply having 150 Volts here and there is not a complete criteria to determine if the set will work or not. If you are going to start with the set a few dollar investment for the service manual is not the end of the world. -- JANA _____ "hr(bob) " wrote in message ups.com... I have just been given an Emerson/Orion 1995 model TC1375A color tv. The power relay clicks on and off from the power switch, everything else is totally quiet. There is +150 or so volts at various points on the chassis when the power is on, but that is as far as I have gone so far. Does anyone have any experience with this chassis? If so, what should I be looking for? Also, do you think it is worth spending $10 or so for the schematic, considering the age of the set. I got it second hand so I have no idea how it was performing before it died, I could do an emission check on each of the 3 CRT guns by digging out an antique CRT rejuvenator/tester if I can find it. Any reasonable/lucid suggestions welcomed. H. R.(Bob) Hofmann |
#3
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Emerson TV ?
On Sep 17, 9:24 pm, "JANA" wrote:
You will need a scope. Check to see if there are horizontal drive pulses reaching the base of the horizontal output transistor. At least you will know if the horizontal scan generator is working. This will indicate that there is an easier chance to service the horizontal output stage to have high voltage. The very first thing is to verify that all the voltages are in correct spec from the main power supply. This is most important. Simply having 150 Volts here and there is not a complete criteria to determine if the set will work or not. If you are going to start with the set a few dollar investment for the service manual is not the end of the world. -- JANA _____ "hr(bob) " wrote in message ups.com... I have just been given an Emerson/Orion 1995 model TC1375A color tv. The power relay clicks on and off from the power switch, everything else is totally quiet. There is +150 or so volts at various points on the chassis when the power is on, but that is as far as I have gone so far. Does anyone have any experience with this chassis? If so, what should I be looking for? Also, do you think it is worth spending $10 or so for the schematic, considering the age of the set. I got it second hand so I have no idea how it was performing before it died, I could do an emission check on each of the 3 CRT guns by digging out an antique CRT rejuvenator/tester if I can find it. Any reasonable/lucid suggestions welcomed. H. R.(Bob) Hofmann I was mostly wondering if this chassis had a reputation for bad picture tubes or Horizontal output transformers or something that would make spending the time to trouble-shoot doubtful. Since it didn't seem to ring any bells here, I'll get the schematic from a place in Canada that only charges $9.00 USA and go from there. I have a Tektronix scope, been using their scopes since 1957 (not the same one), so I shouldn't have any problems once I get started. Thanx for the comments. Bob Hofmann |
#4
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Emerson TV ?
Before any schematics or scopes i would sit down and test a few large
and low ohm resistors and the horiz osc coil and horiz transistor . I dont remember seeing any bad picture tubes in that age of emerson stuff However if the circuit board has bad dark spots under & around big hot resistors the set probably has alot of mies on it . |
#5
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Emerson TV ?
On 18 sep, 03:32, "hr(bob) " wrote:
I have just been given an Emerson/Orion 1995 model TC1375A color tv. The power relay clicks on and off from the power switch, everything else is totally quiet. There is +150 or so volts at various points on the chassis when the power is on, but that is as far as I have gone so far. Does anyone have any experience with this chassis? If so, what should I be looking for? Also, do you think it is worth spending $10 or so for the schematic, considering the age of the set. I got it second hand so I have no idea how it was performing before it died, I could do an emission check on each of the 3 CRT guns by digging out an antique CRT rejuvenator/tester if I can find it. Any reasonable/lucid suggestions welcomed. H. R.(Bob) Hofmann check eserviceinfo.com for the manual - free- before buying anything and the fault finding tips at highlandelectrix.fsnet.co.uk - good luck. b. |
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