11 Jun
2008
11 Jun
'08
8:03 a.m.
On Wed, 11 Jun 2008, Andreas Holz wrote:
Are there any docs, advices and procedures to check an
repair a H7441
Powersupply?
The docs are in the 11/34 printset. The usual fault (at least with our DEC
power supply bricks) is the big capacitor having a short and thus blowing
the fuse. Either replace the capacitor or "repair" it with a high current
pulse which burns away the short.
Looking at the bottom side of the PSU untit there are
three PSU's, two
H7441 with a red LED, the LED of one H7441 is lit, and a H755 with a bulb,
which is not lit. What is the meaning of these LED and bulbs?
The LED (or light bulb) is connected to the output to indicate the
presence of the output voltage. The light bulbs are usually broken; I
replace them with LEDs when I have to repair these power supplies.
Christian