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Author Topic: Repair of SB 220  (Read 1513 times)
AH6TM
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Posts: 4




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« on: December 02, 2000, 06:24:42 PM »

I have a SB 220 which was plugged in and turned on with the cover off.  The safety switch was not deactivated and something was smoked.  I have searched the entire unit for the problem and can not locate it.  Can someone help?  Thanks
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NU7J
Member

Posts: 45




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« Reply #1 on: December 08, 2000, 11:05:39 AM »

I suggest you post your question on the amplifier reflector.  There are a lot of SB-220 experts there who will be able to assist.

See website:

http://www.contesting.com/FAQ/amps

73,

Tom, NU7J
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W4IIV
Member

Posts: 2




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« Reply #2 on: December 17, 2000, 03:03:26 PM »

go to www.vcnet.com/measures/
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WA6GDU
Member

Posts: 1




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« Reply #3 on: December 27, 2000, 12:49:04 AM »

Go to Rick Measures posting on the SB-220.  He describes in detail what goes wrong (and what's right) with the SB-220.  Copy and paste this site:

www.vcnet.com/measures/cisb220.html

Good luck

marlin
WA6GDU
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WT8Y
Member

Posts: 65




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« Reply #4 on: December 27, 2000, 12:43:45 PM »

Did you check the diode's in the high voltage bridge?
You could have taken one or two of them out..
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WB2WJF
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Posts: 2




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« Reply #5 on: January 01, 2001, 04:11:26 PM »

hi chris,

i have a 220 with the same prob. i smoked it myself when i turned it on with the cover off. have you found the problem and if so can you steer me to the answer.
thanks, and 73    ross
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WB2WIK
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Posts: 20603




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« Reply #6 on: February 05, 2001, 04:32:51 PM »

Simple troubleshooting methodology works.  Press the interlock switch down (so the HV is not STILL shorted to the chassis!), grab a V-O-M and measure the resistance between the B+ line (power supply side of the plate RF choke) and ground.  It's bound to be something less than it should be!  (It should be tens or hundreds of kOhms.)  Begin methodically disconnecting sections of the HV system until the resistance increases to something very high, taking notes of what you're disconnecting so everything can be placed back in order correctly.  Normally, this method will reveal one critical component that has failed.  Since you say something "smoked," obviously use your noise to try to sniff out what failed, too (no joke), if something burned, it is likely to still smell that way.  OF COURSE ALL THIS SHOULD OCCUR WITH THE POWER CORD UNPLUGGED!!!  Likely candidates for failure in the SB220 are the plate RF choke and the power supply voltage doubler rectifiers.
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W9GB
Member

Posts: 2623




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« Reply #7 on: October 26, 2001, 02:37:15 PM »

Harbach Electrobics has moved their web site (and location)

Useful SB-200 and SB-220 parts / upgrades

http://www.harbachelectronics.com/


G. Beat
w9gb
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