2 Oct
2013
2 Oct
'13
3:55 a.m.
Christian Corti wrote:
On Tue, 1 Oct 2013, Holm Tiffe wrote:
Christian, I've repairing Switching PSUs and Drive Controllers for the
Industry to get my daily income.
It seems, that I have todo some reverse engeneering on the PSU of the TSZ07
to find out what's wrong. It isn't the main switching part of the PSU that
gets hot, more something like Parts of the Standby Power regulation.
The Power Resistor that was originally in there (smaller as that what I've
soldered in for replacement) is made to get hot, but unfortunately it gets
hotter than is good for the surrounding parts, inkluding the PCB itself.
Maybe the cause is to much current in to the drive itself, maybe the PSU is
the Problem. But I don't even have the pinout from the PSU Connector, nor
I've repaired the PCB but the parts are still
getting hot in standby,
because standby no fan is running..
Have you thoroughly checked the electrolytics? I.e. capacitance *and* ESR?
I recently had the same phenomenon where some parts of a small SMPS were
getting very hot although the load was low. After checking the caps, I
found some that still had their full capacitance, but the ESR was about
0.9-1.2 ohms. A new cap with otherwise same values has 0.02 ohms. I
changed them, and since then, the PS is much cooler.
Christian from the drive electronics itself. That's the
Problem.
Kind Regards,
Holm
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