 Posted: Sat Jan 22, 2011 1:39 am Post subject: |
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| You must have missed something then. Or received a new defective IC, or the board or a foil has crack(s). Sorry but that's about as far as I can guide you. |
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| Posted: Fri Jan 21, 2011 6:55 pm Post subject: yamaha dvds795 |
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| Hello all the surrounding components are ok. I replaced IC1021. but still nothing turns on. What can I do Thanks  |
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| Posted: Fri Jan 21, 2011 1:17 am Post subject: |
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| Check all components around IC1021. Google "testing (name of component)" [example: testing diodes]. If you test a component "in circuit" and get an improper reading, try again after removing (at least) one lead from the circuit. Q1041, if tests good, should be as far to the right as you need to go. If ALL surrounding components test O.K. - IC1021 itself would be the most likely suspect. Found round here: http://www.bdent.com/SearchResults.asp?Search=Strm6559&gclid=CLj6jb6NyqYCFQTrKgodhTmzGw 7. Foreign Orders: Credit cards are encouraged. If not, payment in advance must be made in US funds by wire transfer (T/T), letter of credit (L/C) or international money order. Note: all checks drawn from foreign banks must include a $15.00 handling fee. There are NO C.O.D. shipments to Canada. Found round you: ? |
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| Posted: Thu Jan 20, 2011 2:56 pm Post subject: Yamaha dvds795 |
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| Hello measuring the voltages on the pins of IC1021 with the ground reference pin # 2 of D1011 get 1 322 volts 2 0 volts 3 0 volts 4 0 volts 5 10 ...... 15 volts 6 0.01 ...... 0.04 volts 7 0 volts What can I do? Thanks |
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| Posted: Thu Jan 20, 2011 2:12 am Post subject: |
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| Measure voltages on each pin of IC1021. Reference (ground) is Pin #2 of D1011. | |
| Posted: Wed Jan 19, 2011 7:13 pm Post subject: yamaha dvds795 |
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| Hello Yes, I used the ground reference for measurements according to service manual Yes pin 16 & 17 are to be measured to one another I'm wrong on pin 1 measure -0.3 ..... -0.72 volts What can I do? Thanks |
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| Posted: Tue Jan 18, 2011 10:37 pm Post subject: |
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| You are using a even number pin (2, 4, ...10, 12) as ground (reference) when making measurements? Voltages on odd numbered pins 5 thru 13 will only be present IF pin 14 is low. (should go hi to low when power button is pressed.) Pin 16 & 17 are to be measured to one another (not to ground). Pins 1, 3 15 & 18 all reference ground. IF you have -7.2 on pin 1, usually pin 3 will have something on it. Suggest you remeasure ALL and on any that you don't get a voltage on see what resistance measurement you get with instead. |
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| Posted: Tue Jan 18, 2011 6:58 pm Post subject: yamaha dvds795 |
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| Hello I checked all voltages and in particular on ps1101 pins 1 to 18 1 -11 volts is -7.2 volts 3 +11 volts is 0 Volts 5 +5 volts is 0 volts 7 +3.3 volts is 0 volts 9 +3.3 volts is 0 volts 11 +5 volts is 0 volts 13 +9 volts is 0 volts 15 +5 volts is 0 volts 18 -29 volts is 0 volts virtually no voltage is ok  What can I do? Thanks |
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| Posted: Mon Jan 17, 2011 10:24 pm Post subject: |
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| PS1101 pins 1 & 3 +/- 11 volts? | |
| Posted: Mon Jan 17, 2011 8:28 pm Post subject: YAMAHA DVDS795 |
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| Thanks for your interest the model is G ........ European model. I checked the voltage across pins 1 & 2 of D1011 (bridge rectifier) it is about 322 volts. What can I check again? Thanks very kind |
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