| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1122.1 | C2331 probably = 2SC2331 | GIDDAY::HIRSHMAN | GIGO: Garbage In, Gospel Out | Wed May 15 1991 00:15 | 5 |
| If it's a Japanese made transistor then the real type number is
2SC2331. Japanese manufacturers always omit the "2S" prefix when they
stamp ID's on their semiconductors.
Sorry, but I don't have any specs for the 2SC2331.
|
| 1122.2 | Replacement part number | MPGS::RADOFF | | Wed May 15 1991 12:00 | 13 |
| If the part is indeed a 2SC2331, then Motorola has a similar
replacement MJE13004. This is a high voltage switching power supply
switching transistor.
More importantly, why did these transistors blow out. Did the fuse
blow out? Is there a short in the power transformer? Did a secondary
circuit rectifier or capacitor fail? Did a primary side component
fail? Did a feedback component fail? What I am suggesting is that
failure of the main switching transistors may not be remedied simply by
replacing the parts. The problem may be more serious than that. These
power supplies tend to be very reliable.
Steve
|
| 1122.3 | Thanks, and ... | EVTAI1::LEGER | Vous avez dit GRAPHIQUE ? | Thu May 16 1991 04:04 | 11 |
|
Thanks ,
You're right ,why did these transistors blow out ?
I don't know ... the fuse blow out , but not after removing these
transistors .Rectifier are ok ,and capacitor aren't in short circuit.
I don't know how to test transformer.
The ST in running correctly with 2 external power supplies
I will recheck every transistor,rectifier and capacitor before power up
the suply with load resistor.
Jean-Claude.
|
| 1122.4 | Replacements are available | PRNSYS::LOMICKAJ | Jeffrey A. Lomicka | Thu May 16 1991 11:25 | 2 |
| By the time you put in all that effort, you could have bought a
replacement from Best Electronics. They are very proud of it.
|
| 1122.5 | Its more satisfying to D.I.Y. | UKCSSE::KEANE | | Fri May 17 1991 04:07 | 13 |
|
Hi,
Jeff...... Jean Claude will be even more proud than Best, at being able
to fix his power supply himself!
Re the power transistor failure. I have an old Sony C7 VCR that uses
these transistors. They blew on that, for no apparent reason. I
replaced them only, (after checking everything else) and the power
supply came up and ran OK!
Pat K.
|