F66459X91AP H97 error inverter schematic Panasonic 

Nice information about microwave inverter!

Excellent video. I have a Panasonic NN-SN686S microwave with the same inverter. I picked it up cheap new since it was broken with the dreaded H97 code. I confirmed the problem was with the inverter (and not the magnetron) by swapping it with a working inverter. I then tried to troubleshoot the inverter itself: 1. Applying (with care), live 120V to the board (connector CN702), I was able to verify that the bridge rectifier (DB701) is working along with the zener diodes, filtering caps, and resistor trees to give good low voltage, low ripple rectified current (checked on a voltmeter and scope) 2. I removed the IGBT (Q701/H30R1103) and verified that it is working by testing resistance across the various G/C/E combinations along with doing a diode check testing both polarities across C-E, both with and without the gate charged -- it works 3. I tested the 2 opto-couplers (EC702, EC703) in circuit by applying a voltage across their inputs and checking the output... 4. I tested the choke and both the primary/secondary of the HV coils and they are low resistance - so intact 5. I tested the 2 HV rectifiers attached to the coils and showed they work (though they required about 6-7 volts to forward bias them) 6. I removed and tested the 2 HV capacitors (C701 and C702) and they tested to spec on my capacitance meter (0.28uF and 4.5uF), respectively 7. I tested in circuit, D703 and D704, they worked 8. I inspected the circuit board for cracks, burns, etc. -- there were none 9. I examined the remaining low voltage caps for any signs of burning or bursting - they all looked fine 10. I reflowed the controller IC, just in case... I put it all back together... no smoke... ran for about 6-7 seconds (fan light) but no heating and then H97 again... Given that not much else to go wrong, I'm thinking maybe the "mystery" controller chip was DOA... but no easy way for me to prove it Any other suggestions on what to troubleshoot?

Thanks for this fantastic explanation. I guess a big Waring for the person using it under 220V, obviously, there is some different board for these countries.

VIDEO so useful.thanks sir

Thank you a lot!

I think its best to simply replace both magnetron and inverter. The magnetron has a certain life expectancy, once they reach the dodgy stage it will keep blowing up the inverter periodically. The inverters coils lose their enamel coating and present shorts back to the IGBT and blows that up too. The cause of all of this is usually dirty microwave inside that causes sparks and overloads everything.

Thank u. I have H and COOL errors and after trying new maggy still have same errors. There seems to be HV . My NCV meter shows big voltage at wires to maggy but not value. I'm guessing the chip now. Wonder if I can get a replacement chip.

My LG inverter microwave oven not heating pls help me how can I check and repair...

thank you so much godbless you

Hi, nice video and very instructive about how the feedback work on the inverter. In my case i have an Ikea MWN 200 S, but in fact it’s an Ikea stiker on a Whirlpool microwave. There is an error 5 ou S as it’s the same symbol, the microwave work 5 second on microwave mode then « error 5 ». For your information it’s work perfectly on grill mode. I tried to test the contactors on the door but it’s ok. Ok also for the klixon. As the error appends only on microwave mode i tested magnetron, and it's ok. So two possibilities, the main board or this inverter board. And with your video i think about a simulator to try to identify the one problematic… It’s seem on your video 3:37 than the feedback (green) the frequency is 50 % less and it’s change from 1 to 0 or from 0 to 1 on a change on control signal from 1 to 0 (yellow). So to me the feedback result look like a D flipflop latch, as CD4013, connected on the control signal. What do you think about realise a small circuit with a CD4013 to similate the inverter juste to know if the error 5 is still here (then the main board will receive the good signal as feedback)? Sur the micro-wave will still not work ;)

good Explanation ok But I want Invertor power Supply with magnetron can work without System you know any circuit like 555 ic

The input wires which come to pcb..when u connected the multimeter..why it did not show rhe 220v ...it showed 0.0000...waht doea it mean...plz explain..how to check the 220v comes to mother board.and plz tell us..what is the output from pcb to magntron.tq sir

Hi, how can I get this schematic circuit?

will this fit a Panasonic Microwave model no NNSD986s and how do you know if this part is bad. I've already replaced the wire harness and door switch and have a new magnatron and haven't installed it yet. please help with an answer anyone.

Do you have the opportunity to remove the oscillograms of the magnetron at different power? What is the principle of controlling the power from PWM and what's on the feedback?

Did you find how to interpret the Control signal, is it a pwm of the output power or something else?

La pieza negra que está debajo del condensador verde que se ve al principio del video ,me pueden decir que es?. Gracias

Excellent video. My Panasonic inverter Microwave blows fuse while sitting idle. Sometimes after one hour and sometimes after one or few days while door stays closed. I checked all parts are ok and the microwave works good while fuse is not blown. Please give your comments. Thanks,

Microwave oven using inverter is exposed to sensitive HV spark that may caused the operating system corrupted. The result of this is the oven shut off after start up. Don't look at those micro switch, they are all good except microwave is using a transformer.Try to reset the system to restore the functions. Never think that the magnetron defect is only an open filament. The diode inside is dead. Replaced them directly. My advice that avoid microwave oven using inverter.

Dear, is it possible to convert the microwave to work on the normal converter instead of the inverter? I mean, is it possible to dispense with this inverter card and return to the old or usual system? Thank you

I had a n97 code so I replaced the power inverter and try to turn it on but still had the same problem, so I replaced the whole digital control board display and the problem was gone

Hi Tom, when I start my Panasonic NN-L931BF Inverter Microwave, the timer, fan, and rotating turntable and light begin to operate but stop after exactly 5 seconds. The timer resets to start but everything else stops when the Magnetron tries to kick in. Always after 5 secs exactly. I checked all the door switches and fuses and all is OK. I'm about to pull out the Magneton Do you think this is causing the cook function to reset the oven? It is dated 2001 but I just bought it a year ago. First time this has happened. The magnetron is 2M261-M32, older than the one in your video. I don't believe the fuse is blown as it starts everytime. Do I need to replace the invertor board or the magnetron to fix this problem. Will gladly donate to you for the correct advice....Paul

Hi.Is it possible to have a link to find the schematic of this inverter?

saludos amigo yo tengo el mismo problema pero con el ERROR H98 ke sera ayuda porfis

o ke hay ke revisar gracias

Igbt ka no.kya hai

Cual es el valor de la R701 porfavor

I don know

What?! I'll just buy a new one 😭

Seriously no chip info? First that i know off. Repair probably cost more than buy new. New Parts are expensive unless can find free old parts

مرحبا بك ممكن مساعدة

Ln

ممكن ترسلي المخطط لكلا الدائرتين