[TechAssist] Re: Electrohome 69CK02 or Mitsubishi CS2915C,chassis WM-A-C15R,need schematic

  • From: Gary McCartney <gary@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Tue, 14 Oct 2003 10:15:28 -0400

Kevin, did you cold spray the SAW filter?




Gary McCartney

McCartney Electronics
Guelph Ontario Canada 
Est. 1984
email: gary (at) number63.ca








Kevin wrote:
> 
> Electrohome 69CK02 or Mitsubishi CS2915C, chassis WM-A-C15R, need
> schematic.
> 
> I just replaced the unknown zener with a 9 volt zener with no change in
> the voltage and the buzzing noise and lines.  Now my only hope is to get
> my hands on a copy of the schematic.  Thanks.
> 
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
> 
> 
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin
> Sent: Sunday, October 12, 2003 11:15 PM
> To: TECH-ASSIST
> Subject: [TechAssist] Electrohome 69CK02, WM-A-C15R, need value of ZD502
> and schematic if possible
> 
> This 27" set has a loud buzzing noise in the speakers and white
> horizontal lines in the picture--but only for a few minutes.  Then the
> set works perfectly.  Cold spray has no effect on the good working set.
> I found a zener diode off of pin 30 of IC200 which "zeners" at about 8
> volts.  IC200 crosses over to NTE7054 and pin 30 is supposed to be 9
> volts.  I tried to look up the number on the diode, B1408, with no luck.
> Does anyone know the voltage of this Zener diode?  Thanks.
> 
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
> 
> 
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