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| chieftec_aps-550s https://vlab.su/viewtopic.php?f=46&t=130747 |
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| Slave82 [ 04 дек 2022, 02:15 ] | |
| Заголовок сообщения: | chieftec_aps-550s |
Dead Fan4800 replacment 6800 All smd tranzistor change i Q703 MPS2222 q703 emitor 20 volt ? |
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| borvins [ 04 дек 2022, 10:24 ] | |
| Заголовок сообщения: | Re: chieftec_aps-550s |
Q703 Emitter Voltage 14.3V Base Voltage 15.0V Collector Voltage 16.5V (19.5V) Verify D703 zener diode 15V Verify Q703 again Warning For CM6800 ABSOLUTE MAXIMUM RATINGS VCC 20V Did the replaced CM6800 chip also burn out? |
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| Slave82 [ 05 дек 2022, 18:57 ] | |
| Заголовок сообщения: | Re: chieftec_aps-550s |
I changed Q 703 and D703, although according to the instrument they were correct, and in the end they were. I put 530 ohms in the r607 by mistake, because the power supply was repaired a year ago in a hurry. Of course, now I have corrected the error, checked all the smd transistors, they are all OK I also changed u201 FAN4800. I again put 6800 voltage, e 0.7 volts mps2222 emitter 20 volts Base 1.50 and Collector 0.7 volts I don't know what else to do! IC-501 TNY278 Pin1 -0.5 volti Pin2 -6.2 volti-ok Pin4 -305 volti |
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| borvins [ 05 дек 2022, 20:21 ] | |
| Заголовок сообщения: | Re: chieftec_aps-550s |
Вложение: transistor.jpg If U702 active then Q703 Collector Voltage 16.5V (19.5V) Base Voltage 15.0V Emitter Voltage 14.3V If U702 passive then Q703 Collector Voltage 16.5V (19.5V) Base Voltage 0V Emitter Voltage 0V |
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