Recent content by ph2113

  1. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    Hi Rafaecorp, You might apply "+" to Pin 14 and "-" to Pin 15 for the 1st time. then do it again with reversed polarity ("-" to Pin 14,"+" to Pin 15). Jack
  2. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    I have tried to find a good replacement for STV-2H-O(orange dot) just in case I might need it one day. The best I have found so far is HER 105 which meets the specs of Vf range of STV-2H-O: The Vf of STV-2H-O(@If= 7mA): Vf_min:1.07 V Vf_max:1.15 V Scanned 10 smaples and got the average Vf...
  3. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    After adjustment the idle currents now are about 68mV on both channels. ---------------------- Before ---------Now Lch idle current: 106mV ------->~68mV(specs:70mV) Rch idle current: 60mV -------->~68mV(specs:70mV) Power consumption: 70W ------>~62W (idle mode,no input/output) Temperature of...
  4. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    Correction: From above data the actual power consumption was at least about 6.32W higher than normal: ((actual idle current_R+idle current_L)/0.94 ohm)*2*110-((70mV+70mV)/0.94 ohm)*2*110V)=((107+60mV)/0.94 ohm)*2*110V-(70+70mV)/0.94 ohm*110V=6.32W This means if the idle currents on both...
  5. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    Today I did few more measurements on the SA-9800 with higher idle current on the Lch.those data may help someone who wants to know more about SA-9800.the measurements made with top case opened,the room temperature regulated by an air conditioner...
  6. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    Well done! Thanks for sharing how you did it with us.
  7. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    The SA9800 with dim VFD had been sitting on the shelf for over 6 months before I took it off the shelf couple days ago, after many short warm-ups it's now ready for test. The 1st issue I found is the standby power consumption too high 113Vac/0.790A/70W about 7W(10%) higher than normal...
  8. ph2113

    FF/REW fix ctf-8282,9191,1000 RXA-581, NOT DIY

    Very useful information.well done!
  9. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    Couple days ago I figured out how to measure the electron current emits out of the filament,I tested it today on a Samsung VFD, the Ife curve trace explained why a higher Vg makes VFD dimmer,because Ife is not always increasing with Vg(Grid Voltage). I will do same test on VFDs of my SA9800 soon.
  10. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    Congratulations! Now we have three successful cases.soon we will be able to find a better and safe way to proceed the VFD rejuvenation.
  11. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    (5. VFD Rejuvenation) 5-b.Rejuvenated VFD: Before and After Finally I got everything I needed and proceeded this experiment,fortunately I succeeded! the result is good,it's much brighter than before and close to normal,but it's still a little bit dimmer if compare with my another SA-9800.can...
  12. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    5. VFD Rejuvenation: There is a chance that my dim display could be saved by moving the ash(or oxidization) on the surface of filament(if it's the cause of my dim display).the high temperature can vaporize or shatter the ash and reveal uncovered filament.I am going to try it this week...
  13. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    4.Replacing Relay: The contacts of the Omron relay(MY2-J 48VDC) is dirty(the DC contact resistance sometimes >0.5 ohm),it caused weak R-ch and distortion. I replaced it with a Idec relay (RM2V-U DC24V with a 48DCV coil),it passed my contact resistance test before I install it in the SA-9800...
  14. ph2113

    Repairing SA-9800 #2: Dim display,Dirty Relay & Poor mechanical contacts

    I am repairing my 2nd SA-9800,this one has dim display,dirty relay contacts and couple poor SW contacts. I am gonna fix them as many as I can. 1.Standby power consumption: Main------Current------ Watt(true power) 113.8Vac ~0.710Aac ~60.5W(before relay tripped) 113.5Vac ~0.730Aac...
  15. ph2113

    Display Pioneer SA 9800

    Rejuvenate the display! One of my three SA-9800s has a dim display too,I am gonna try it.
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