Mongo
Well-known member
Soooo.... I started with a NeoTec 2701 with horizontal collapse (single vertical white line). I contacted NeoTec for schematics and saw in their block diagram IC401 and IC301 are both complicit in that circuit. So... I pulled the number off the schematic (mistake) for BOTH ICs and ordered them. Since both are high failure parts, I replaced them both and started troubleshooting.
I have now completely lost deflection in both directions. So I grab the old parts and find that IC301 on the schematic is listed as an NTE 7085.... the part I pulled was an NTE 7039. So... off to the parts store to grab an NTE 7039. Got it, replaced it..... and still no deflection. I pulled up the spec sheets and these two chips are WORLDS apart functionally. Anyone care to take a look and see if they can figure out what all I fried?
http://www.datasheetcatalog.org/datasheet/nte/NTE7039.pdf
http://www.nteinc.com/specs/7000to7099/pdf/nte7085.pdf
I have now completely lost deflection in both directions. So I grab the old parts and find that IC301 on the schematic is listed as an NTE 7085.... the part I pulled was an NTE 7039. So... off to the parts store to grab an NTE 7039. Got it, replaced it..... and still no deflection. I pulled up the spec sheets and these two chips are WORLDS apart functionally. Anyone care to take a look and see if they can figure out what all I fried?
http://www.datasheetcatalog.org/datasheet/nte/NTE7039.pdf
http://www.nteinc.com/specs/7000to7099/pdf/nte7085.pdf
