SB-610 Troubleshooting

[Charles Seitz]

If the scope powers up and the capacitors do not appear to be 'loading down' 
the minus HV,
start by replacing the HV divider resistors.  Every Heath scope I have 
repaired needed new
resistors there.

The paper capacitors for the sweep circuit in my SB-610 also needed to be 
replaced
because the sweep was extremely nonlinear.  I still don't observe a nice saw 
tooth sweep
waveform so I think that circuit was engineered to be minimally adequate for 
its application.

I have not been able to get the two-tone generator to work.  The tube looks 
good and the
DC voltages are 'right on'.  I cannot believe the network modules are bad 
because I have
never seen these kinds of things fail.  I have been told there is not enough 
open loop gain
to sustain oscillation but have not gotten around to investigating that.

---  CHAS  WA2DYA


----- Original Message ----- 
From: "Goss, Ed" <Ed.Goss at JHUAPL.EDU>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Monday, September 19, 2005 09:46
Subject: [HEATH-TEMPE] SB-610 Troubleshooting


All,
     I have an SB-610 monitor scope that is showing signs of
age...specifically, trace brightness fading and out of focus.  I'm
fairly sure those symptoms represent power supply problems, or part
aging.  I wondered though if anyone could point me to any parts that
tend to fail more often than others, and that would be responsible for
the symptoms I noted.  Thanks for any help.
--Ed G--

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