Board D371A in generator Polydoros SX50 (RAS Interface)

[TechnoMan]

Hello
There was a malfunction in the Siemens Siregraph D2, console shows only Initialization message. Found fault in the motherboard D371A RAS Interface, burned fuse 4A pitcher on her current. Can you provide a scheme for a board D371A (Typ D10-05101SIE). Discovered on her faulty element Schottky rectifier SBS1045, resistance in both sides 0,1 Ohm, it is possible that faulty something else.

[vesper]

Hello there.

To help you I am going to need some more information:

- What kind of generator you have?
- Which console shows only init message?
- Where is the "D371A" board you mention located? (The part number you provide is not a valid Siemens Part No. - Siemens Part Numbers are 7-digit numbers). Are you sure about the "D371A" name? (I did not find any such board in the books)
- What is the name of the fuse that was blown and on which chassis is located?

[TechnoMan]

Generator Polydoros SX50
Console shows "Polydoros SX50"
In the service documentation, it is denoted D371A (PSU 5V), and there is still D371B (24V power supply is operating)
The board notation:
Typ: D10-05101Sie
Sachnr.: 31 51 818/A
D10-05101Sie S379 9358438
15.1504.300 00HSSNR00607
Seriennr.: 00HS125567
Fuse is S4, 4AT
When compared with the working apparatus is off the light on the motherboard D211 "Gen OK" and does not burn the light on the board SMP4 LED V2 (bottom)

[vesper]

OK. Now we're talking ...

This chassis is called N93 (RAS-Net Controller).

It is very difficult (if not impossible) to find the schematic for this PSU board.

I would suggest to check for short-circuit the rectifier bridge and the capacitors (I have marked them on the attached photo).

Measure between the pins (D/B/Z-22,D/B/Z-24) and (D/B/Z-26,D/B/Z-28). If you measure a low resistance value between these two pins, then start removing parts from the board until the short-circuit is eliminated.

I am attaching the part of the schematic, which shows the input voltage connection to the board (in case you don't have it already ...).

Good luck.

[TechnoMan]

Thank you for your reply.
What is the contact -F, +F?

[vesper]

The +F and -F lines are the sense (feedback) lines for the +5V coming back to the Power Supply from the backplane of the chassis.

[TechnoMan]

Thank you all, the problem solved replacing the board D371A, the topic can be closed.