gunsablazin
New member
Ok, This chassis worked perfectly before I hooked it up to a donor tube and had the yoke wires hooked up wrong(backwards) i know , im an idiot !! but i'm learning
sizzle, sizzle, fry, pop!
Ok, actually just a little smoke came from either the flyback or a diode at D501.(which looked burnt-so assumed that was it.(looked on a working g07 and noticed D501 is not even used???? so i left it empty)
THE SCREEN SHOWS NOTHING BUT A BLUISH LINE HORIZONTALLY ACROSS THE SCREEN, WITH A FEW LINES JUST AN INCH OR TWO BELOW IT.(yes anode is at top of tube)
so here's what's been done.
1. installed new caps
2. new flyback
3. checked all traces visually and with a meter- all seem ok
4. switched out the ic501 chip
5. installed two brand new x401/x402 transitors
6. pulled out fr401 and it measured correctly (68ohms)
7. measured voltage at R1 and got 120v on leg toward the tube and 174.6 at the other.
8. installed new R908
IM GUESSING WHATEVER IS CAUSING THE COLLAPSE IS ASSOCIATED WITH THAT READING OF 174.6V BEING TOO HIGH? isnt it supposed to be closer to 145v?
***** The DONOR TUBE, YOKE, AND YOKE WIRES ARE ALL FINE AS I INSTALLED A WORKING G07 WITH NO ISSUES !!! *******
I am just about to change all 400's resistors..... PLEASE HELP me, Johnny
sizzle, sizzle, fry, pop!
Ok, actually just a little smoke came from either the flyback or a diode at D501.(which looked burnt-so assumed that was it.(looked on a working g07 and noticed D501 is not even used???? so i left it empty)
THE SCREEN SHOWS NOTHING BUT A BLUISH LINE HORIZONTALLY ACROSS THE SCREEN, WITH A FEW LINES JUST AN INCH OR TWO BELOW IT.(yes anode is at top of tube)
so here's what's been done.
1. installed new caps
2. new flyback
3. checked all traces visually and with a meter- all seem ok
4. switched out the ic501 chip
5. installed two brand new x401/x402 transitors
6. pulled out fr401 and it measured correctly (68ohms)
7. measured voltage at R1 and got 120v on leg toward the tube and 174.6 at the other.
8. installed new R908
IM GUESSING WHATEVER IS CAUSING THE COLLAPSE IS ASSOCIATED WITH THAT READING OF 174.6V BEING TOO HIGH? isnt it supposed to be closer to 145v?
***** The DONOR TUBE, YOKE, AND YOKE WIRES ARE ALL FINE AS I INSTALLED A WORKING G07 WITH NO ISSUES !!! *******
I am just about to change all 400's resistors..... PLEASE HELP me, Johnny
