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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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TVR 10241 capacitor???
Hi,
I've been given a friends PC Power supply to repair. It's a Enermax EG651 (550W) model. It was damaged when he plugged it into a 240V supply while the voltage select switch was on 115V (Doh!!). Anyway a quick visual shows that two large ceramic capacitors are blown. The capacitors are mounted next to where the wire from the voltage select switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241 on the components themselves, they are about 10mm diameter. Does anyone know what rating these are? Also if anyone knows what further damege may have been done (hopefully none ) Replace 'NOSPAM' with 'btinternet' to reply to my email. |
#2
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TVR 10241 capacitor???
"BigBadger" wrote in message
3.157... Hi, I've been given a friends PC Power supply to repair. It's a Enermax EG651 (550W) model. It was damaged when he plugged it into a 240V supply while the voltage select switch was on 115V (Doh!!). Anyway a quick visual shows that two large ceramic capacitors are blown. The capacitors are mounted next to where the wire from the voltage select switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241 on the components themselves, they are about 10mm diameter. Does anyone know what rating these are? Also if anyone knows what further damege may have been done (hopefully none ) Replace 'NOSPAM' with 'btinternet' to reply to my email. I've been advoised that the components are most likely MOV surge arrestors... Same question applies though... where can I get them and what rating? |
#3
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TVR 10241 capacitor???
On 6 Jul 2004 19:28:18 GMT, BigBadger put
finger to keyboard and composed: Hi, I've been given a friends PC Power supply to repair. It's a Enermax EG651 (550W) model. It was damaged when he plugged it into a 240V supply while the voltage select switch was on 115V (Doh!!). Anyway a quick visual shows that two large ceramic capacitors are blown. The capacitors are mounted next to where the wire from the voltage select switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241 on the components themselves, they are about 10mm diameter. Does anyone know what rating these are? Also if anyone knows what further damege may have been done (hopefully none ) These two disc shaped components are MOVs (metal oxide varistors) with a breakdown voltage of 240V (?). I'm betting they are connected across each of the two main filter capacitors. In normal operation each of these caps charges to around 175VDC. If the SMPS is wired for 110V when connected to a 240VAC supply, then these caps will attempt to charge to 350VDC. The MOVs prevent this from happening ... catastrophically and sacrificially. If you are lucky, only an additional fuse and NTC resistor may need changing. It may be a good idea to remove the voltage selector switch and its two wires if you intend to operate the PSU solely from a 240VAC supply. This switch is open in 240V mode. You can also leave out the MOVs in this case, or replace them with two high value resistors, eg 220K 0.5W, if not already present. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
#4
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TVR 10241 capacitor???
On 6 Jul 2004 19:28:18 GMT, BigBadger put
finger to keyboard and composed: Anyway a quick visual shows that two large ceramic capacitors are blown. The capacitors are mounted next to where the wire from the voltage select switch joiuns the pcb. They are marked Z1 and Z2 on the pcb and TVR 10241 on the components themselves, they are about 10mm diameter. Does anyone know what rating these are? See http://www.sicovend.ch/uploads/TVR.pdf They are rated at 240V nominal, with a maximum clamping voltage of 200VDC. - Franc Zabkar -- Please remove one 's' from my address when replying by email. |
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