Question about Nissin Speedlite Di622 TTL Flash for Canon

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Why is there no triggering voltage?

The 68 meg resistor is good

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Acquired snap on ya219 that didn't weld. Replaced the capacitor. Powered on and struck an arc on the the ground lead. I removed the welding wire and noticed that when the wire speed was turned all the way...


Could be a shorted output rectifier (diode). This would cause a lot of current pull, and therefore voltage drop (fan slowing down). The electrolytic capacitors are for dc voltage, and will blow with wrong polarity, which means ac voltage would be the wrong polarity half the time.

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How do I replace the 3 x 332k resistors with a 1 meg Ohm resistor? I cant find a video on U tube.


Go to http://www.searspartsdirect.com/partsdirect and enter your Model Number and you should be able to get a PDF Manual to download. I hope this helps, Ken.

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Please help me, i'm repairing 14" old model television.. it don't have brand name but it is using 47C434N-R201 system, TA8680N video chroma IC, 30115 regulator, my problem is it don't have...


Good day!

Try to check the base of the horizontal output if have a signal from the chroma or jungle i.c it should have 5-7vac to trigger the high voltage.If no voltage try to hang it and check again if the voltage appear while you hang it,your ply-back got partially defects replace it with the same type and ratings.
Next,if you already hang the base of h-out and still no voltage on it and the chroma i.c is new.Trace the line from the base of h-out to the chroma/jungle i.c.Test the parts that pass through that line such as open/change value resistors.

I hope this solution will be helpful.Thank you I'm very glad to share my idea.Good luck.

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I have a Crate Palomino V16 Amplifier. The Reverb became intermitant after about a year of use and has now quit completely. Have cleaned the contact area of the cables and inputs to the tank but still no...


Looking over the schematic I see all sorts of poor design. The reverb is driven by IC TL072 chip and the output is received by the same.

This chip is supplied with +/- 15.5 volts UNREGULATED which is stupid! If you get a power surge, the IC will be destroyed. Myself I would put at least a shunt Zener regulator on these voltages. Use a 100 ohm resistor in series and Zeners to ground for both the plus an minus 15.5 lines.

First thing check those 15.5 volt... the plus is on C23 pos term and the neg is on C24 neg term.

They have a 1 meg resistor to ground from pin 3 of the chip to bias the + input of the chip. This is TOO big as the input leakage current can be too much. I would reduce this resistor to 220K and increase C22 to 0.0047 mfd.

Check the DC voltage at pin 1 of the chip (IC1). It should be VERY near zero.

The output buffer for the reverb has better design. Check for zero volts or very near it on pin 7 of the chip. Be careful not to short to pin 7 which is pos 15.5.

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Since there is high voltage (320 volts) use great caution when working on this amp.

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1 Answer

Power seems to cut in and out - it 'clicks'and a second red light comes on - most of the time just one red light is on. Thanks


The click you hear is most likely the speaker protection circuit relay due to the protection circuits being triggered. In the event of a dc voltage appearing across the speakers the protection circuit isolates the the speaker terminals from the output stage.
Dry joints on the relay is not uncommon and causes false triggering. Check both pos' and neg' supplies are present at the output transistors / ic. Connect a dc volt meter across the speaker output terminals if a voltage of more than a few millivolts appears just before relay clicks then check the ouput stage for dry joints, leaky transistors and resistors having increased in value.

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1 Answer

Links to schematic? and What does this solid capacitor equate to in value.. First line...68, second line ..35K? How do you read this? Is K tolerace? is 68pf or uf? or is it a code?


Hello:

The 68 represents the capacitance of the capacitor, if it says 68 uf this is microfarads if it says pf then its means 68 picofarads. The K represents the DC working voltage limit, Then K means thousands so the working voltage limit for this capacitor is 35 thousand Volts.

Please leave comment THX

Oct 08, 2009 | Televison & Video

1 Answer

Amp cuts out


could be an internal problem such as a relay or resistor or something of the sort

Sep 02, 2009 | Car Audio & Video

2 Answers

Already changed two big STK's and checked resistors . . ..


another problem that you want to check with the convergence board when replacing amp I/C's is to check the resistance of the resistors next to and around I/C's as I also had 2 that were very high resistance,like 3.8 meg-ohm,they were resistors rk-50 and rk-54 located on board.They should have been 1.4 ohm and 3.0 ohm,not 3.8 meg-ohm.
did you use the same IC's numbers and did you get OME part and not generic?

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