zd104 zener identification
Hi
Bauer XT32 psu, PSM210-417
Does anyone know what voltage the zener is for ZD104? I know its is a BZV55 but no idea on the voltage, I think it has a red, red, blue bands reading from the cathode. The second picture shows the zener removed but the colour bands look alot clearer stuck in the glue!
**broken link removed**
**broken link removed**
It is conected between the base and earth so presuming it is limiting the base voltage from going to high and saturating the transistor (BC858 Q307) which was open circuit (so not switching the next switch mode powers supplies on to supply the 12V and 24V rails) I believe the BC858 has 12V on the collector which is used as a switch to pass it on the the Emitter, the base gets its turn on/off voltage via 2x 4.7k resistors and a optocoupler from 12V also, the zener is from base to earth, what is likely to be the voltage of this zener.
Chas Hyde list Kit15 and Q307 is listed as a BC858 a PNP, but i have my doubts on this as the circuit sugests it is a BC850 or BC848 NPN, can anyone confirm what transistor Q307 is?
I know DZ301 connected to the FSD210 is 7.5v and has violet green green bands (shown in the first post on this page reading from the cathode) and is also a BZV55 but this one survived! it is the ZD104 thats short, can anyone help please?
this has happened due to the usual 5V standby circuit blowing up which is now fixed and supplying 5v as it should
I just need to replace this zener and transistor to see if psu works, if not its going to be IC101 and i will get the kit, dont want to spend out £40 on the kit if i dont need the IC's!
many thanks in advance
Andrew