I am pasting the fix I posted for this model a few weeks ago. BTW, the fly will not ring good in the circuit because of PCC transistor Q409 even though the transistor is good. John........... This Sansui COM7200(made by Orion in 2002 - 27" combi) gave me a lot of trouble. The horizontal output transistor had B+ and (some) drive on the base (1.6 volt p/p) but no HV. The problem turned out to be the horiz. drive transformer, Orion 0450190161. I compared the new transformer to the old one and the DC resistance was almost identical, however the inductance reading on the primary of the old one was half the new one (40mh compared to 72mh on new one). The base signal on the working set is 12v p/p. Thanks to Mark Goldspiel and Jerry Silverman for suggesting the transformer as the problem. -- Paul wrote: > I'm am trying to pin down the reason for no high voltage. This was made by > Emerson I believe. I do not have service lit. for this set. I have replaced > the HOP xstr. I have soldered the IHVT & driver transformers as well as other > associated circuitry. I have removed and rung the IHVT. HOPxstr.has 130v on > collector.What I don,t have is a wave form of any significant size or shape > on HOP collector. So I disconnected the collector checked the wave form on > the base of the HOPxstr. Wave form is good.My logic was OK then, it has to be > in the secondary some place. But where? Well, I reasoned If I unsolder the > primary connect the ringer and unsolder one secondary at a time it should > show up. As I unsolder-ed each pin it finally rang good(went from4to41).Great > I said thats the leg that is bad. Wrong! I chased that circuit till I found a > place to disconnect every thing on it. No help. I continued to unsolder the > next couple of pins on the IHVT finally came to one that let the ringer go > back to 41. It was the ground.The question is where is my logic faulty? Am > I expecting to much from the ringer? Sorry for the rambling? Paul > > > Paul ,B > Central TV&Video > > Grover Beach Ca. > > ***************************************************************************** > The Tech Address Book: > http://www.tech-assist.org/secure/tip/contact.html > Add a Repair Tip Here, or Change/Remove your Email Address: > http://www.tech-assist.org/secure/tip/main.html > Lost Password: > http://www.tech-assist.org and select "Lost your Login Info?". > Email Archives: > //www.freelists.org/archives/techassist/ > -- John Mielke Main TV Longmont,Co 80501 303 776 6955 303 776 0792 fax maintv@xxxxxxxxxxx ***************************************************************************** The Tech Address Book: http://www.tech-assist.org/secure/tip/contact.html Add a Repair Tip Here, or Change/Remove your Email Address: http://www.tech-assist.org/secure/tip/main.html Lost Password: http://www.tech-assist.org and select "Lost your Login Info?". Email Archives: //www.freelists.org/archives/techassist/