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Help! Blew the R7 resistor (2K2) on the PSB!

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Is there anyone experienced blowing the R7 resistor on the Kit One power supply board (PSB)? Would you please show me how to fix it? (I did replaced the resistor. Yet, it blew in seconds after I put the power back on.)
My Kit One has worked for around three months. About a month ago, the R5 resistor on the PSB and the C4 capacitor (0.015 uF) on the driving board were blew. After replacing them, this channel is now working smoothly. Unfortunately, one month later, the R5, another channel of the same resistor of R7, was blew again.
I did check the voltage of the secondary of main transformer to 5U4G. The reading is 435 V (about 15 V higher than the value specified on the manual). Is this higher feed causing this problem? Please help me to stop blowing these two parts! Thanks in advance!
Best regards
Luke

Follow Ups:

Re: Help! Blew the R7 resistor (2K2) on the PSB! - scarebus 11:55:55 04/17/05 (3)
Luke,
Most likely you blew C1 this time. In addition check C2, C3 also.
Do you have copper 0.015uf caps?
Chris
- Re: Help! Blew the R7 resistor (2K2) on the PSB! - LukeSung 20:00:36 04/17/05 (2)
  Hi Chris:
  Thanks for your help!
  I did check the C1 capacitor. It shown no short circuit (I don't know if it means OK or not.)! Do I need to replace it anyway? Please advise!
  I didn't have the spare C1 in hand. Yet, there is a local supplier in Taiwan keeping stock for this.
  Regards
  Luke
  - Re: Help! Blew the R7 resistor (2K2) on the PSB! - scarebus 23:06:37 04/17/05 (1)
    Hi Luke,
    If you don't have a capacitor tester, you can use an ohm meter,
    to check if there's a short or not. a good cap should read some
    resistance and quickly go to infinity. A bad cap should read some
    resistance all the time.
    Did you buy this Kit1 from your local distributor? Can you
    send me a pic of the components with the wiring to scarebus1@yahoo.com
    Regards,
    Chris
    - Re: Help! Blew the R7 resistor (2K2) on the PSB! - LukeSung 19:41:05 04/18/05 (0)
      Chris:
      I have received a mail from Brian regarding the copper caps. He suggests me to insulate the copper shell since it is easy to touch to the holding screw and metal casing and causing short. To me, it is still a myth.
      The kit has been working for three months till the problem occured. It didn't convince me that the problem is caused by a touching "metal casing" or the screw. Moreover, it happened in both channels.
      The cap (C4) I replaced last time is purchased from Jensen's local dealer (not kit 1's dealer). They didn't have the copper tube package in stock but packed by aluminum with a plastic insulator. I did replace the failure one with it and it works fine till another channel failed.
      I did check the resistance as you mentiuoned in previuous mail. It shows no difference in both channels. However, I will try to replace C1 with the plastic insulator one to see if it will work. Wish me luck!
      I will let you know the result in "short"!
      Regards
      Luke

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