Electronics > Repair
Need help for reparing a ISOTECH IPS-2303 PS / GW INSTEK GPS 2303
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JacquesBBB:
Dear All,

In the ISP-2303 power supply  (2 0-30V 3A channels, also known as GW INSTEK GPS 2303), there is a push button for activating the output.
If this is not activated,  all   displays are set to zero ( see picture).
When you press the toggle button, the output becomes as normal.

But in my unit, it does not work.
If I press, nothing happens.

I have started to dismount the unit (see pictures).

From my preliminary analysis, the button should toggle one of the relay trough  the MC14013B flipflop chip, but as I do not have the schematics,
my progress are slows.

If anybody has the schematics, this would be great.
Otherwise, if some one has some experience in this PSU, any help would be welcome.

JacquesBBB:
Really, nobody knows anything about this power supply ?
2N3055:
Well,
on photo output switch looks bent.. If that is not just a distortion on photo I would start from there...
Measure on a switch if there are voltages on it and if there are changes when you activate it..

How did it happen? Did you buy it broken? Did it work before? Was there something that happened after which it stopped working?
There are several fuses inside..
These are analog PSU with digital voltmeters/ampermeters. They can be traced component by component.
I don't think schematic is publicly available...
simba15:
So I have made a few repairs to one of these supplies.

But my issue has been with the display module,  the fuses blow and need replacement ( so I made external holders).

I would check all fuses and start looking for voltages measurement points.

JacquesBBB:
@2N3055

I got the unit in this state. I suppose it worked before otherwise it would have been  returned .

I have the shematic for the GPD units, but this is not of great use as  GPD are controlled by a PIC MCU.
I have a tuning manual for the GPS,  but it does not contain schematics.

The output switch is functioning well. The problem does not come from the switch itself.

This switch (push button) connects the pin 4  (R) of the  4013 flipflop  to GND ( VCC of the 4013) . VSS of the 4013  is -15 V.

C and D of 4013 are to VSS
S is  to VCC (GND)

 
@Simba15

The fuses look OK . I will nevertheless test them next week end ( I have no access during the week).
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