Re: NR90GC Nail Gun controller board repair
To be honest after some testing I don't think there's anything wrong with the controller board. I originally pulled it all apart as the fan wouldn't run, which caused the board to error.
When I've been testing the board I've had it powered with my bench top power supply and it seems to work fine, the fan runs ok and I get a spark. So I think the issue is that the battery's are shot.
They do seem to charge up ok and do hold a charge, could it be that they can't provide enough power to start the fan.
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pintglass
Senior Member
Last Activity: 07-30-2024, 03:46 PM
Joined: 07-05-2019
Location: Congleton
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Re: NR90GC Nail Gun controller board repair
Do you know what it is they use, I was thinking of using silicone to reseal but have read silicone can be acidic so may cause corrosion.
I've drawn a blank trying to find any info on this IC, no micro controllers seem to have VCC on pin 1 and GND on pin 2....Leave a comment:
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Re: NR90GC Nail Gun controller board repair
The nail gun doesn't have any means to sense a nail jam the only sense it has is that the firing mechanism is fully depressed so it knows its pressed against a piece of timber before it fires. Usually if there's a jam the firing mechanism will not depress.
When I've been testing it just this doesn't seem to be working though as the controller seems to fire without sw2 being grounded.
I will test this but the whole board was encapsulated in some kind of silicone/coating that's...Leave a comment:
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NR90GC Nail Gun controller board repair
I am in the process of trying to repair a controller board for a Hitachi NR90GC nail gun. The gun has no mechanical reason why it won't work. So I am assuming there's an issue with the PCB.
I've draw a schematic of the pcb by tracing/probing around the board to help try and find out why its not working.
Firstly can you just have a look at the schematic to check if I have made any obvious mistakes.
Secondly can you give me a clue as to what the main IC (U1) could be, as the IC only has the marking of the model number of the nail gun on it. Could it... -
Re: DV-PF4E(UK) Power suppy repair
I do now seem to have output, the only voltage that seems low is the AL-30 all the others seem fine.
The buzzing is worse when the power supply is connected to the main board.
This text is from the service manual
When buzz sound can be heard in the vicinity of power circuit.
Check if there is short circuit on the rectifying diode and the circuit in each rectifying circuit of secondary side
and service it if defective. (D013, D014, D016, D018, D019, D1008, D1016, D1030, IC1002, IC1003, Q051,...Leave a comment:
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Re: DV-PF4E(UK) Power suppy repair
I found that the transistor Q1003 was shorted between base and emitter so I replaced that and changed Q1001 again, but I'm getting a loud buzzing I think from T0011 the power transformer and still getting no output.Leave a comment:
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Re: DV-PF4E(UK) Power suppy repair
I've replaced the mosfet Q1001 with the same part as was installed originally, but resistor R1043 keeps failing going open circuit.
Does anyone know what other component could be causing this?Leave a comment:
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DV-PF4E(UK) Power suppy repair
Hi
I'm trying to repair an internal power supply in a Hitachi DV-PF4E video/dvd combi player.
I've narrowed the fault down to Q1001 a N channel mosfet (2SK3566) which seems to be shorted, when powering the power suppy this takes out resistor R1043.
I don't have any of these mosfets but do have some FDPF5N50UT's would this be a suitable replacement?
I've attached the schematic for the DV-PF4E the power supply section being on page 88, I've also attached the datasheets for the mosfets.... -
Re: Powerline Network Adapter power Issue
I've checked the resistor and it seems fine giving a reading of 619 K ohm's...Leave a comment:
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Re: Powerline Network Adapter power Issue
I agree I should just throw this away, but my curiousity gets the better of me at times.
Just out of interest on page 4 of the datasheet for the LNK623 it shows a reference design schematic with the feedback winding on the secondary side of the transformer but in the output regulation section of text it says
"The output voltage is sensed using a primary referenced winding on transformer T1 eliminating the need for an optocoupler and a secondary sense circuit"
Does this mean the reference is on the primary...Leave a comment:
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Re: Back to Back Transformers
The transformers do get hot after a while with no load especially the input transformer. I think when I was testing before I got more of a voltage drop with them the other way around.
Disconnecting the meter does improve the waveform.
I agree but finding two the same is not easy when trying to do it on the cheap, as this is only a hobby for myself....Last edited by pintglass; 08-23-2020, 04:52 AM.Leave a comment:
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Re: Back to Back Transformers
I've attached an image from my scope.
This was captured with no load.
Yellow trace is connected to the output transformer.
Blue trace is connected to the 12V side.
I don't seem to be getting a great waveform is this to be expected using transformer's back to back....Last edited by pintglass; 08-22-2020, 10:37 AM.Leave a comment:
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Re: Back to Back Transformers
I've just tested and indeed when connected to a load the frequency does drop to 50Hz
Just for testing purposes am I ok to connect my oscilloscope on the output transformer, do I connect the ground clip or leave of?Leave a comment:
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Re: Back to Back Transformers
Yes the schematic is how I have it wired up.
I don't have an earth connection.
I will test later today with a load.
I have an image somewhere of how, what is now my output transformer was wired up orignally in the charger, if i remember correctly it could be switched from slow to fast charging, which I assume would mean the transformer is wound in parallel for higher current when fast charging....Last edited by pintglass; 08-21-2020, 11:30 PM.Leave a comment:
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Re: Back to Back Transformers
Do you mean that the output transformer's 240V side has dual windings in parallel, as I am only connected to one of them.Leave a comment:
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Re: Back to Back Transformers
What do you mean by having the right phasing ?Leave a comment:
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Re: Back to Back Transformers
Yes with direct connection and no diodes my multimeter is showing 100Hz
Yes I have a scope
I only get 50Hz on the 12V windings
Even if I disconnect the energy/power meter I still get 100Hz on the output Transformer.
The output transfomer does have more than one tap but I still get 100Hz on both of them.Leave a comment:
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Re: Back to Back Transformers
Thats how I've got them setup.
I've attached an image of how there wired. The transformer in the bottom of the image is the 240V in, with a fuse before it, then the two 12V's are connected together then the output is the transfomer at the top.This goes into a power meter display then into a DPST switch....Leave a comment:
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Re: Back to Back Transformers
Both the transformers are from old 12V battery chargers both of which had rectifiers in them aswell.
If the transfomers had rectifacation would they still need a seperate rectifier.
I'm just measuring with my multimeter and going off what its reading which is 100HzLeave a comment:
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Back to Back Transformers
Im currently building an isolation transformer from 2 240v-12v transformers, wired with the 2 12V secondaries joined to give 240V out, which I am getting.
The Issue I have is that I'm getting 100Hz out from 50Hz in.
Can anyone tell me why that may be?
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