 Posted: Mon Oct 04, 2010 8:53 pm Post subject: |
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| Q514 E=0 B=1.5VDC C=5.3VDC
Q502 S=0 G=5.3VDC D=159.4VDC |
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| Posted: Mon Oct 04, 2010 8:31 pm Post subject: |
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| its been a while but i finally sat down and checked this transistor , it reads likethe link says it should with mega ohms on s and g also g and d , the diode measurement shows good one way and open just like in the link , so the question is now what ? i think everythings been checked except Q 514
Sorry that i haven't been able to get around to this sooner thanks MIKE |
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| Posted: Mon Sep 13, 2010 3:48 pm Post subject: |
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| http://wiki.answers.com/Q/How_you_check_whether_mosfet_is_working_or_not | |
| Posted: Mon Sep 13, 2010 3:25 pm Post subject: |
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| I haven't had any time to work on this but had a few minutes and decided to check all the resistors and diodes that you listed and they all check ok , so now i have to remove the 2sk3326 transistor to check it unless i can check it in circut ? , i currently do not have a transitor tester so my question is can i check it with the ohms or diodes settings ?
Mike |
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| Posted: Sat Sep 04, 2010 9:45 pm Post subject: |
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| Affirmative.
IF Q502 does not test good, especially if you obtain any shorted readings, I would suggest testing (in no particular order) R542; D507; R544; D523; R502; Q514. IF Q514 checks bad: R545; D524; D509; R508; D506 & IC504. Report which item(s) bad and whether open, shorted, leaky, etc. |
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| Posted: Sat Sep 04, 2010 9:28 pm Post subject: |
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| There is no voltage on these capacitors , well theres less then 1 volt it seems on c501 but tripple checked these electrolytics and theres no voltage , So what to do next? that q502 ?
Mike |
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| Posted: Fri Sep 03, 2010 11:32 pm Post subject: |
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| Q502 is known to go bad it's a 2sk3326. | |
| Posted: Fri Sep 03, 2010 7:08 am Post subject: |
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| jts1957 i haven't been ignoring you i've just been mentioning ideas of what might be wrong , when i can i will check the voltages on the capacitors you mentioned, time has not allowed me to do much with the set , so probably Saturday i will be able to read the voltages
thanks so much for your help Mike |
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| Posted: Fri Sep 03, 2010 4:52 am Post subject: |
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s/c = short circuit horizontal output (or Zenith "Space Command"). 
Sorry for multiple post. 7:40 post has rare "edit" button, but not this one. |
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| Posted: Fri Sep 03, 2010 2:26 am Post subject: |
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| S/C line ? if i checked the transistor on the heat sink and its bad then its probably whats wrong but time has slowed me down on this so i can only do a little here and there
mike |
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