Ok nothing to worry about then.

I think i was wrong about my clock battery , when in working order ,should the display stay when you remove the batteries ? I thought i had seen the display staying after removal but last time i did it gone immediadtly ,i just think i was wrong somewhere...

Yes, please see my JX707 memory battery post for evidence that it stays on with external power.

I will read again yes. I thought the display had stayed the firs time i removed the batteries(i had used some alkaline bat.).Last time i changed them it would shut off. Have you noticed that recheargeable batteries are "quickly" out of power with your walkmans ? I've noticed this with my JX series or may be i don't recharge them enough ,usually one night(say 12 hours or something) , they discharge very quickly although those are supposed quality batteries(some 700 mA and 1000 mA Uniross ,same for some Carrefour supermarket  branded).

I am still using 1200mAh AAA NiMH rechargeable batteries I bought from eBay a number of years ago Capacity has dropped from the rated 1200 to just under 1000mAh. I get quite good playback time on mine, usually about 4 hours playback on tape and 5 hours on radio. I also use Technoline IC8800 charger to condition and charge my batteries. The Technoline charger has digital readout to enable capacity readout of individual cells and pairing of similar capacity cells. It is still worth keeping the cheaper dumb chargers though, as the Technoline does not recognise extremely flat batteries so the dumb charger is needed to put a little bit of charge into the battery first. Third party review - http://www.techmati.com/photog...s900-battery-charger

Even though NiMH batteries are said to not have memory effect like NiCD batteries, they still need to be reconditioned from time to time and capacity can decrease.

Some are new batteries ! All are Ni-Mh now. I was thinking about buying a smart charger but they are expensive.

edit: ok 4 to 5 hours is finally short too ,as i sometimes record the radio it surely use a lot of power(radio+recording).

Smart chargers are pricey, but to be honest they are worth every penny. Otherwise how would you know whether your new NiMH battery was faulty or just need conditioning? Just because batteries are new is no guarantee that they are as advertised. Plus not all batteries are made equal. When I bought my 1200mAh batteries, through the smart charger I was able to determined that there were a couple batteries that had a slightly lower capacity, so from that point on I was able to pair those slightly lower capacity batteries together so that they would discharge comepletely together at the same time.

Over-charging with dumb chargers can damage your batteries, and in the end you could spend more money buying new batteries to have them damaged by the dumb charger. I would prefer to invest in a smart charger and minimise the need to have to invest in new rechargeable batteries instead. Do you not find it strange how battery manufacturers bundle dumb chargers with their batteries? They want you to prematurely kill your batteries so that you just end up buying more

Yes, you do use more power when recording, since more circuits are being used.

YES ! I DID IT !!!

What do you think about that picture Plop ?

Yes , i dared ! And what should i say ? With the good tools...it was so easy in regards to my experiences with my JX849.... but i didn't used the right method of course... It's so easy to work with flat cables removed ! And you MUST work with rosin impregnated desolder braid ,it's a miracle with it , don't use anything else(non impregnated , pump ...) ,really. I opened both my japanese and western with succes.

edit: oh,by the way,they both needed a full caps replacement ,no surprise.Both got a new belt too and a good regreasing and they are fine now. Now got to study the JX849 case....

I did wonder what it was you had "did" in your earlier post, but at least you've followed up with a bit more detail in this one.

Good to see that you too have discovered the benefit of using rosin impregnated desolder braid. It makes controlled mopping up solder a lot easier.

Also good to see that you've taken the time to carefully remove the delicate flat ribbon. I know how much you hate to remove them too. This will help to minimising stress damage to the weak point of it at the hinge area.

It is a wise move to replace the capacitors if you have made it this far into the JX707. As you'll have discovered already, it is no easy walk in the park to get into the JX707. Don't forget to also check that the hinge screws are tightly secured also, as they do become loose and can affect playback quality as stable head alignment depends heavily on them being fixed in place.

Sure it's not as easy as other models to get inside but with the right method(yours!) it was so easy. What about hinge screws ? Where are they located ? Outside at the back of the door ? I didn't noticed anything , may be in the reverse mode with the western one ,not that stable ,i will have to check again when i know exactly what you're talking about. Now too little things i noticed ,when i've tested the W. one after job was done , i could'nt reverse record and i figured out it was missing the security record detector(don't know how do you call this in english) , i've searched and searched but could'nt find it anywhere, i don't know if it was here or not ,strange that i didn't figure this out before... well nothing too anoying. The tape speed should also beeing adjusted,nothing too dificult. The japanese one is fine , just something curious is that when you remove batteries , a few seconds later as they come in the sleep mode(don't know how to call this) , the display stops showing "fwd" and switch to "rev" then the tape animation starts(wich seems normal since the W. one shows this too) but the W. one do not switch to "rev" but stay to "fwd" ,i suppose you see what i mean. The player is working fine for all functions ,so i wondered why this was normal or not. Then i carrefully took a look at the pictures after dismantling and look :

Do you see ? One of the switch is sets to reverse ! And i just figured out i did switched it to reverse because an early picture shows the switch in the fwd position. But how can it work fine then ???

Yes all caps had to be replaced even in the W. one wich was almost fine but i noticed some troubles when recording , now they both record strong and clear.Record quality is excellent. I don't know if i should open the japanese one again or not ,i suppose i'll do that later(about the switch position) ,there's a quick way to lift the board a bit.

It is the screws to hold the hinge brackets to the tape transport chassis. Check that they are tightly screwed down as they can work loose over time with normal use. You can only check them one the JX707 is fully disassembled (ie main PCB removed).

Check your soldering between the main PCB and small long switch PCB

The revolving tape reel on the LCD display is normal when the main battery is removed.

I can't remember exactly, but I think the switch controls the status of REV FWD on the LCD display. It should not be changed manually by you, unless you know that the tape mechanism is not matching that of the switch since you could have powered off the JX707 with it set in REV mode.

That's too late now to check the screws... next time may be.

Why would you make me check the soldering ?

I don't remember how it was powered off but truly it must have been in the fwd mode because an earlier photo shows the switch in the fwd mode , i must have switched it to reverse mode accidentaly when working. When powered there's no issue , when you take the batteries off , it remains in the fwd mode(on display) if in the fwd mode ,then a few seconds later the display switches to rev when the real goes rolling(on the display). Well since that's only the display ,that's not too annoying.The westen one keep the display in the fwd mode.

Check the soldering for cold/dry joint.

Why ? There is fresh soldering from a few days there.

By the way talking about the screws , would it affect both direction or not ? The western one is fine in the fwd direction but is unstable in the reverse direction(ie when you put the unit upside down), do you think this is in connection with the screws ? I'm not sure that it happens with all tapes ,i need further tests to say , i didn't noticed that in the fwd mode. The tape guides seems fine ,may be is it related to one of the pinch roller but i don't know.

edit: when i say unstable i mean a lost in the azimuth.

If as you've stated that the tape guides are not damaged on the pinch roller assembly, then it could be the hinges working themselves loose.

The hinge brackets are held to the tape chassis by a single screw. They should be threadlocked to prevent movement. However over time and use, they work themselves loose. The same hinge bracket is where the head assembly rests against. Bad design, but AIWA needed to save space so that was the compromise they made. Not so the case with the previous generation of models like that of JX505 where the head assembly is not so loosely held together.

The JX707 in general have bad head alignment, even if the screws on the hinge brackets are tight. This is just down to bad quality control of components during manufacture. I have seen over half a dozen of them and virtually all of them have some level of azimuth imbalance relative to the opposing tape direction.

I n my case the fact is that it's like the tape(the real to be exact) is moving when you move the unit (ie from horizontal good to vertical or upside down bad) , i will check again the tape guides but i'm sure all is here or may it be that plastic tape record detector that has moved somewhere i didn't saw.... like in the mechanism ??? Anyway , i have to check all this again with multiple tapes , check again if nothing is missing about the tape guides or some play in the head assembly so that it could well be those screws...

A little nap later... Well i took my western one and i saw the display continuously switching between fwd and rev ,so that's surely not a switch concern , may be the recheargeable battery needs a rechearge. I've also taken another tape and it is fine with the reverve playback. The tape in question was to the end/beginning ,that's may be were the problem occurs or simply that tape , but as i said , further tests will tell.

edit2: today the western one was found with "rev" on the display , well i suppose nothing to bother with this, check yours sometimes and tell me.

Dear friend - BOUGHT BELTS that were previously 'ORIGINAIS''MAS NOT THE SAME RAN VERY WELL .... OR SKATING OR NOT HAVE POWER TO REWIND ..... CAN BE ANY ELECTRICAL PROBLEM? I have 02 AIWAS THAT HAVE THAT SAME PROBLEM: JX810 and JX707 - WAIT HELP. THANK YOU