[Amps] SB-220 metering

[Wt8r@aol.com]

In a message dated 3/22/02 4:59:32 PM Eastern Standard Time, 
n4zr@contesting.com writes:


> 
> My SB-220 has quietly, undramatically lost relative power and HV metering.
> The grid metering function still works fine on the same meter, and I'll be
> darned if I can see anything burned, or any common components in the HV and
> relative power metering circuits.  What am I missing?
> 
> 73, Pete N4ZR
> 
> 
Peter, 

I recently repaired a SB-220 with symptoms like you describe.  No apparent 
damage was visible in the metering circuit.

The problem was with the high resistance 2 Watt resistors (I think there were 
4) in the metering string...one had opened up without visible physical 
evidence and indicated that NO high voltage was present when, indeed, the 
total high voltage was there but not metered due to the open 2W resistor.  
Replace the resistors in the HV metring string and it probably will fix your 
problem.

73  de

Dave, WT8R 


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
---