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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Jitter on locked horizontal part of image - B&W transistorized TECmonitor
I have an older monitor from a video game - and it has a jitter on the
horizontal lines on the screen (vertical is locked), yet I don't see this jitter on the H Sync. Using a signal generator (Cross-Hatch, Dot, etc.) and all outputs are the same. Game source also shows same jitter on same screen. It is not the WICO monitor signal generator as other B&W monitors show a locked image. Schematics he http://www.flippers.com/pdfs/TEC_TM-...23_Monitor.pdf Monitor has been recapped. Horizontal does lock, but jitter still present. Suggestions appreciated! Thanks, John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." |
#2
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Jitter on locked horizontal part of image - B&W transistorizedTEC monitor
On 26.02.17 23:06, John Robertson wrote:
I have an older monitor from a video game - and it has a jitter on the horizontal lines on the screen (vertical is locked), yet I don't see this jitter on the H Sync. Using a signal generator (Cross-Hatch, Dot, etc.) and all outputs are the same. Game source also shows same jitter on same screen. It is not the WICO monitor signal generator as other B&W monitors show a locked image. Schematics he http://www.flippers.com/pdfs/TEC_TM-...23_Monitor.pdf Monitor has been recapped. Horizontal does lock, but jitter still present. Suggestions appreciated! Thanks, John :-#)# Sounds like the power supply is starting to fail. Check the caps there, for bulging ca[p tops, and replace them. While it is open, also check around the high voltage area, and if you smell ozone, something is producing sparks. Clean and replace bad caps. |
#3
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Jitter on locked horizontal part of image - B&W transistorizedTEC monitor
On Sunday, February 26, 2017 at 5:06:38 PM UTC-5, John Robertson wrote:
I have an older monitor from a video game - and it has a jitter on the horizontal lines on the screen (vertical is locked), yet I don't see this jitter on the H Sync. Using a signal generator (Cross-Hatch, Dot, etc.) and all outputs are the same. Game source also shows same jitter on same screen. It is not the WICO monitor signal generator as other B&W monitors show a locked image. Schematics he http://www.flippers.com/pdfs/TEC_TM-...23_Monitor.pdf Monitor has been recapped. Horizontal does lock, but jitter still present. Suggestions appreciated! Thanks, John :-#)# -- (Please post followups or tech inquiries to the USENET newsgroup) John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) www.flippers.com "Old pinballers never die, they just flip out." You said it "has a jitter on the horizontal lines on the screen (vertical is locked)". Just want to be clear. Do you mean to say the horizontal lines from the generator are jittering up and down indicating a vertical problem? |
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