Hi, this is an update about that [B]Delta Power MAX 500ATX [/B]project.
After searching on internet I realised I could not find the exact schematics needed. Some "seem" to have
the same exact topology and same parts but, looking more attentively, many parts are not identified.
Others are well documented but the topology/circuit itself is not the same.
Then I tought why not remove/unsolder the resistors, capacitors etc. and after that build a new PSU from an
exact schematics that I have found. Anyway I cannot repair the actual Delta Power, what...
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Hi, thanks or replying
[USER="478"]PeteS in CA[/USER] : From my initial message:
"On the high voltage rectifier diodes I read +166 and -166 V. "
"On the high voltage heatsink measure is -166 V. "
[USER="414449"]harp[/USER] : With power supply not connected to 120 V.:
There is no shorts on the 3 power transistors on the high voltage side.
There is no shorts on the LM339 and 7500B ICs
Yesterday while I was doing...
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Hi, [USER="414449"]harp[/USER] : With power supply not connected to 120 V., resistance to ground is:
for 12 V. : 230 ohms
for 5 V. : 22 ohms
for 3.3 V. : 15 ohms
Hoping this will help somewhat.harpHi, [USER="414449"]harp[/USER] : With power supply not connected to 120 V., resistance to ground is:
for 12 V. : 230
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Hi, @stj: the voltage switch has been removed and a jumper wire soldered on the pcb for the 120 V. selection.
Here are power transistor voltages on the high-voltage heat sink.
In front of these transistors, from left to right:
Q1-Pin 1: -163 V.
Q1-Pin 2: +163 V.
Q1-Pin 3: -163 V.
Q2-Pin 1: 0 V.
Q2-Pin 2: +163 V.
Q2-Pin 3: 0 V. (connected to Q3-Pin 2)
Q3-Pin 1: -163 V.
Q3-Pin 2: 0 V. (connected to Q2-Pin 3)
Q3-Pin 3: -163 V.
Heat sink vltage: -163 V.
@harp: I will test resistance...
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>>> Troubleshooting Delta Power MAX 500ATX ATX power supply
Hi, this is for troubleshooting and, hopefully, repairing a Delta Power psu
that is still quite new, as it worked OK for some months until it failed.
At the time I was not into power supply electronics; it was put
aside and a new power supply installed inside the computer. Also at the time
power supplies were half the price of today's.
On the PCB there are a D339 and 7500B chips.
I have found that schematics with these 2 chips (see included file).
Does it represent the actual circuit of the MAX-500ATX, I cannot tell.
Some measurements,...
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