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Old 16th October 2005, 03:44 PM   #11
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There isn't neither any bias level nor any change in bias level when Turning the bias control.
Even trying to vary the CAL bias VR652b has nothing effect to the bias level.
And the bias frequency measured across C786 is 105khz.
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Old 16th October 2005, 03:52 PM   #12
anatech is offline anatech  Canada
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Hi Mike,
Interesting, what are the levels now? Typically level is done at 400 Hz and bias is done somewhere between 6 and 12 KHz. You should check the signal generator in the deck to make sure it's working.

Now if wish we had a schematic! Can you post the schematic or email it to me. A digital picture might work. This would have to be sent to my email (too big to post). My link works, bhome at sympatico dot ca.

The signal generator will only operate in Record - Calibration mode. Did you say you had a 'scope?

-Chris
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Old 17th October 2005, 02:09 PM   #13
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I just send you full audio schematic of Akai GX-95mk2, size 12mb.
a return notification:The user(s) account is temporarily over quota.
You might try to subscribe to www.gmail.com where you are given en email space as large as 2.5g.
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Old 17th October 2005, 06:46 PM   #14
anatech is offline anatech  Canada
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Hi Mike,
Yeah. The family certianly can chip away at the 10M limit I get. Doesn't matter since even that's under your size.

Thanks for trying, I will figure something out and e-mail you.

-Chris
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Old 8th November 2006, 11:11 PM   #15
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Default help needed

Mike Wong.

Hello from Spain

I'm new here. I've searched for help to repair my Akai GX-95, and I've found this web (Which I already was registered) and this thread.

As I'm new here, I may not send you an email.

I think I broke my deck when recording a high frecuency signal (about 18 Khz). It seems amazing, but after doing that test, It records a lot of distortion on chrome and metal tapes at low frecuencies.

I need to find out what is wrong, and I would like to have the schematics of that tape to follow the signal path with an oscilloscope.

I've measured the distortion using a silly pc-based oscilloscope and a pc-based signal generator.

The board has very few indicators about what stage

Could you, please, get in touch with me??

llagona (at) hotmail

Thanks
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Old 9th November 2006, 01:41 AM   #16
bawang is offline bawang  Malaysia
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Chris and Mike, I own an Akai GX-52 and love it to death. Bought it during my student days in UNB, Fredericton, New Brunswick, Canada, at a store named Magic Forest.

I've amassed a huge collection of recorded cassettes, mostly encoded with Dolby B/C HX PRO. Recently I've decided to convert this collection to CD but discovered that my deck is malfunctioning! Specifically the Dolby circuit. Played without Dolby, it's normal, but with Dolby, all high frequency sound gone.

What can I do?

The deck is mechanically sound...... I am at my wit's end.....
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Old 9th November 2006, 02:20 AM   #17
anatech is offline anatech  Canada
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Hi rotovator,
You did not break your deck recording an 18 KHz tone. Something may have failed, but you didn't break it. Check that the record oscillator is putting out a sine wave. Sometimes caps fail in the bias oscillator or rec / play switches get dirty.

Hi bawang,
It's unlikely that your deck is okay mechanically. Head wear and tape path problems can both do this. Clean your head with Methyl Hydrate (Canadian Tire, paint section) to start.

Guys, perma alloy heads (AKA Glass heads) wear as well. It's hard to see though. The head gets wavey and the gap actually chips so it's wider. These heads also overload easily. Metal tapes and Memorex will tear any head of any deck, believe it.

-Chris
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Old 9th November 2006, 07:26 AM   #18
bawang is offline bawang  Malaysia
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Chris, the deck is rarely used. It used to sound fine (with and without Dolby NR) the last time it was used, about a year ago. I still switch it ON once in a while, but it was not used to play cassettes, just power ON. The problem just appear recently, when I took it out of retirement....... Help.......
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Old 9th November 2006, 09:50 AM   #19
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thanks anatech for your reply

I know It shouldn't broke when recording a 18Khz signal. But it worked ok before and bad after that test... it's strange, maybe the fault was there before and something has brought it into life. I realized it one or two days after the test, so maybe...

I'm waiting for the oscilloscope to arrive. I will check bias signal, and many other things, but I also suspect that the problem could be in the record amplifier. I suspect this because recording on normal (Ferro) tapes is ok, no distortion observed... Is this a reasonable thought?
Does changing from Type I tapes to Type II or Type III affect only to the bias signal and level?? Is the recording circuit unique for all three types of tape??

wait!...

I'm having a look a tandberg 3034 schematics and the recording amplifier appears to have partial different internal signal paths for different tape formulations. So I answer myself a little.


Thanks bye
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Old 9th November 2006, 02:55 PM   #20
anatech is offline anatech  Canada
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Hi rotovator,
Quote:
So I answer myself a little.
Yes. Bias level will change. You may have any number of faults. A distorted bias signal will look like a distorted audio signal. Audio rec level changes as well.

-Chris
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