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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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ASTEC 150W AC/DC SMPS power supply
I am working on a ASTEC 150 watt AC/DC SMPS power supply
model:LPQ154,CSA File No:LR84459,year:May 1995: http://www.astec.com/products/datasheets/lp/lpq150.pdf I found the outside 3 amp long fuse burnt,F1=5 amp small (on the main board) burnt,along with Q1=IRF840 and Q2=IRF840 in the troubleshooting process I assumed Z4= was shorted but it wasn't and I broke it in two. Does anyone have the value for Z4=Zener diode?,the # I got off it was something like "2C2" which if correct is 2.2v but when I put one in along with new Q1 &Q2 the unit's secondary voltages try to climb but the 100 watt light bulb I placed in series with the line voltage is limiting the current and thus preventing the same failure of parts. Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova scotia Canada |
#3
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ASTEC 150W AC/DC SMPS power supply
On 25 Jun 2006 22:15:25 -0700, "Wicaksono" put
finger to keyboard and composed: Is this Z4 shaped like a disc & connected in primary winding area just like the transistors ? If this is true then looks like Z4 is a varistor. Check the power supply without Z4 to see if this is the cause of short circuit. "Z4" would imply that there were four MOVs. I don't think that's very likely. wrote: I am working on a ASTEC 150 watt AC/DC SMPS power supply model:LPQ154,CSA File No:LR84459,year:May 1995: http://www.astec.com/products/datasheets/lp/lpq150.pdf I found the outside 3 amp long fuse burnt,F1=5 amp small (on the main board) burnt,along with Q1=IRF840 and Q2=IRF840 in the troubleshooting process I assumed Z4= was shorted but it wasn't and I broke it in two. Does anyone have the value for Z4=Zener diode?,the # I got off it was something like "2C2" which if correct is 2.2v but when I put one in along with new Q1 &Q2 the unit's secondary voltages try to climb but the 100 watt light bulb I placed in series with the line voltage is limiting the current and thus preventing the same failure of parts. Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova scotia Canada - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
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