2465B what should the Inverter voltage be with a primary test load be?
Can any one tell me what voltage you have seen with the "primary test load"?
I have been working on a 2465B that had a burned smell on power on.
(message 87960 and 87620)
I think the primary problem was that the -8V cap C1102 leaked and the board under it turned conductive and fried. I have drilled a hole in that spot now.
Something else is not working
I removed the all the caps on the secondary side of T1060 except for the +5VD and I have two, Two ohm resistors connected for a +5v load.
The inverter runs with a low input voltage (less then 90VAC) but cuts out as the input voltage increases.
To try to track down the problem I made a Primary test load and connected it.
I get about a 120 VDC average across the test load but the voltage swing is more like +/- 10 V to 15 V with a triangle wave with the positive tips flattened.
The Inverter trouble shooting flow chats say that their should be 120V with a 1V P-P triangle wave.
The only thing I can see is that R1071 has been hot. Other then the larger triangle wave I don't yet see what the problem is.
Not making any progress I went to another working 2465B with power voltages that check ok and removed the power supply, I had to change the X2 line capacitors anyway.
I placed it in the original bad scope and it worked.
To compare with the non-working supply I took it back out on the bench and connected the primary test load and get the same looking wave which has a much higher P-P voltage then listed in the manual. 120V with about 20V peak triangle wave (smaller p-p as the load is increase by 75W but still at 10-15 volts p-p)
Can any one tell me what voltage you have seen with the primary test load?
Should it a 1-2V triangle or 20V triangle wave?
If it should be 1-2V what would make it higher?
I know this an old thread, but I'm in the process of repairing a PS as well.
I got the same: a rock solid 120.4V ,but with a ( bit distorted) 15-20V triangle riding on top.
After reading your message, I assume there is a typo in the service manual flowchart.
The triangle ripple seems very high at 15-20V, check the ESR and capacitance of the bus caps on the PRI REG,
Usually the ripple of a switcher should be ~ 1-2% of the DC, not 10%.