tb lilley
Member
I have a G05-05 in an Asty DLX. The monitor has suffered, occasionally, from loss of HV. I've always been able to sort that by reseating the HV diode.
The last time it happened, like a plank, I stuck the HV diode in backwards. Result was blown fuses at F100, and F101. I replaced those fuses today. Fired it up, only to find I'm missing vertical deflection. Spot killer was on.
Took a look at the deflection PCB, discovered a blown fuse at F600. Fuse should be fast blow 2A. Didn't have one of those to hand, so stick in the closest I had available: 4A.
Fired it up. No picture. That might be because I'd turned the contrast and brightness right down before I fired it up. This time spot killer is lit, but very dim .... Noticed smoke coming off the deflection PCB, but not sure where from. Pulled the deflection PCB again. Resistor at R620 was hot to touch. That resistor sits between the two transistors at Q606 & Q607.
So, questions:
Would a defective Q606 / Q607 cause F600 to blow?
Would replacing F600 with a higher rated fuse cause R620 to get super hot?
Where do I get replacements for Q606 / Q607 (MPSU57 / MPSU07)?
Am I barking up the right tree?
Here's a pic of the relevant section of the deflection PCB. All components I've listed above relate to vert deflection and seem most likely:
Grateful for any help / advice.
The last time it happened, like a plank, I stuck the HV diode in backwards. Result was blown fuses at F100, and F101. I replaced those fuses today. Fired it up, only to find I'm missing vertical deflection. Spot killer was on.
Took a look at the deflection PCB, discovered a blown fuse at F600. Fuse should be fast blow 2A. Didn't have one of those to hand, so stick in the closest I had available: 4A.
Fired it up. No picture. That might be because I'd turned the contrast and brightness right down before I fired it up. This time spot killer is lit, but very dim .... Noticed smoke coming off the deflection PCB, but not sure where from. Pulled the deflection PCB again. Resistor at R620 was hot to touch. That resistor sits between the two transistors at Q606 & Q607.
So, questions:
Would a defective Q606 / Q607 cause F600 to blow?
Would replacing F600 with a higher rated fuse cause R620 to get super hot?
Where do I get replacements for Q606 / Q607 (MPSU57 / MPSU07)?
Am I barking up the right tree?
Here's a pic of the relevant section of the deflection PCB. All components I've listed above relate to vert deflection and seem most likely:
Grateful for any help / advice.