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PostPosted: Sun Sep 16, 2018 12:34 pm 
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Location: Cranbrook, BC, CA
Hi my Akai GXC- 570d deck rewinds and fast fowards but doesnt play? Any ideas how to fix?


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PostPosted: Sun Sep 16, 2018 12:57 pm 
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Location: Montréal, QC, CA
Hi,

when pressing play button, you should hear a big clap, it is a solenoid that engages the play function.

Do you hear that clap ?
Does the play green light come on (and stay on) ?


So far, since REW/FF work, the 24v is there, so it's not the power supply.

It could be the play button itself, the solenoid or its driving circuit.
Or a simple transistor in the REW/FF circuit. Yes it could be that.

Tell us more a bit on what you hear and see when you press the play button.

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PostPosted: Mon Sep 17, 2018 2:15 pm 
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Location: Cranbrook, BC, CA
Hi, thanks for your help.

I hear the loud clap when I hit the play button, it lasts for a second or two and then stops, light goes on at first, then goes out.

Around six months earlier I tried to record with it. It did play and record button light worked but didnt record.
Now the record button doesnt work or turn on.

I tried to get the back off the unit for pictures but its complicated. Maybe the front comes off?


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PostPosted: Mon Sep 17, 2018 5:47 pm 
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Location: Montréal, QC, CA
Kootnuck wrote:
I tried to get the back off the unit for pictures but its complicated. Maybe the front comes off?
If you are patient and follow me, we will end by find the exact problem. In case you have to send it to a tech, the fix will be easier and that will cost less money.

Power off. Press Eject. Pull up gently the door lid to remove it.
Then remove the front panel for now. Take out the 4 Allen screws in the front.
Use the right Allen key. Do not attempt if you don't have the right one, which is exactly 3mm.
Take your time to not scratch the front panel. Put the front panel away in a safe place.

Once the front panel is removed (do not forget to remove the knobs first),
the vu-meters will fall a bit. The wires will hold them so don't worry and do not touch them at all.

First step is to check the mechanism because 90% of tape deck problem is mechanical.
Power on. Check if both capstans are turning. They should be. If not, the belt is probably out or cut or stretched.
In this case, you need a new belt.
Attachment:
front panel removed.jpg
front panel removed.jpg [ 246.26 KiB | Viewed 778 times ]
Now look closely at the next 2 pictures.
Attachment:
left pr arm.jpg
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Attachment:
right pr arm.jpg
right pr arm.jpg [ 264 KiB | Viewed 778 times ]

Take a little screwdriver and try gently to move each arm in the direction of the arrow.
You should see the spring stretching and the arm moving a few millimeters. Both left & right arm should move easily.
You must feel the spring tension/pressure.

If they are difficult to move, or don't move at all, stop everything and put back the front panel, this is the problem (stuck roller ass'y).

If they move easily, then let's go the next test.

Put in a cassette (your cheapest). Do not press play. Try REW 15 seconds and then press STOP.
Look carefully when you will press STOP; look the cassette supply reel (left), does the reel stop instantly or the reel takes one second to stop.

- it stops instantly - electronic problem
- it stops within 1/2 to 2 seconds - all ok

Next step
Now it's time to press the play button. But once again, look carefully and tell us what you see, what's happening.
You should see the head's plate ass'y move up. During the time it is on play, does the cassette reels turn ?
- if yes, ok
- if no, try again the play button and with a small screwdriver, try to help the take-up reel (right one) to turn.
- if that helps and the play stays on, look if the counter works. If no, the STOP function is detecting it and stops the play function.
In this case, it's the counter belt that is faulty.
- always with your help to turn the take-up reel and the play stays on, can you hear music ?
- if yes, it's all good.
- if no, we need to go next step...

So, try all the above, slowly, carefully and report back your findings.
Do not try any other thing and expressly not the record button.

Mik

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PostPosted: Tue Sep 18, 2018 8:01 am 
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Joined: Sun Sep 02, 2018 1:08 pm
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Location: Cranbrook, BC, CA
Wow thanks for the detailed help. This should get to the bottom of the problem.

I hear a nice little bell chime every time I move the unit.


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PostPosted: Tue Sep 18, 2018 11:10 am 
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Joined: Tue Dec 07, 2004 7:16 am
Posts: 538
Location: Hamilton, ON, CA
Kootnuck wrote:
Hi my Akai GXC- 570d deck rewinds and fast fowards but doesnt play? Any ideas how to fix?


(RE: my Akai GXC- 570d deck ...doesnt play")

Count your blessings.

pj


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PostPosted: Tue Sep 18, 2018 3:55 pm 
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Location: Montréal, QC, CA
Kootnuck wrote:
...I hear a nice little bell chime every time I move the unit.
Well, there's a "bell" in the deck it is the capstan motor flywheel.

So, tell me if the capstans are well turning. They should turn with the power on, no need to press any button.

Are they ?

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PostPosted: Wed Sep 19, 2018 6:12 am 
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Location: Cranbrook, BC, CA
Oh sorry I couldnt get to my workshop, I should be able to work on it today. I will let you know soon, thanks.

I just noticed my Akai reel to reel is also GX.


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PostPosted: Wed Sep 19, 2018 6:44 am 
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Location: Montréal, QC, CA
We are all waiting for you.

No no, I'm joking.

In fact, take your time coz you will need to be focused to give us a detailed report.


Better your feedback, better we can help. Better technicians could also chime in.
So give us the best report you can.


Nice R2R btw...

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PostPosted: Wed Sep 19, 2018 5:43 pm 
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Location: Cranbrook, BC, CA
Hi, so I got the front off, wow what a solid front plate!

Anyhow powered on and the the capstans arent turning.

My deck looks a bit different, I didnt see the little arms to move.


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PostPosted: Wed Sep 19, 2018 11:28 pm 
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Location: Montréal, QC, CA
Well, I just saw that you have the MKII version which is a different machine.

But anyway, it's a detail for me so let's continue would you.

Since you said the capstans are not turning, it's time to open the beast.
Remove the 3 screws at the back
Attachment:
GXC-570DII-back.jpg
GXC-570DII-back.jpg [ 121.62 KiB | Viewed 504 times ]
There will be 6 of them to remove under the casing. (do not remove the plastic feet)
The wood casing will slide off at the back, be careful or get someone to help you
to not damage anything since the deck is heavy.

Once done
Attachment:
GXC-570DII-cover off.jpg
GXC-570DII-cover off.jpg [ 119.19 KiB | Viewed 504 times ]
The arrow shows you where to look at the back to see the capstan motor and the belt.
(sorry I don't have better angle image)

On the SM we can barely see the belt but it gives you an idea where and what to look at.
Attachment:
GXC-570DII-sm.jpg
GXC-570DII-sm.jpg [ 186.12 KiB | Viewed 504 times ]

Power on. Knowing now where to look, tell us what you see and hear:
the capstan motor - running or not
the belt - broken or defect or missing or not
listen carefully - is there any fuzzy noise or not

If ever the belt is there and looks ok, try to help the motor to turn by
turning by hand one of the capstan flywheel or the motor shaft itself.
Look out, it could start to turn.

We are close to find the origin of the problem.

The thing with the pinch-roller arms was to know if they can move freely.
You can check them anyway. Just try to move them up/down.
It's important to know since they could be the cause of other problems.

Well, back to bed, it's very late... I'm a zombie :mrgreen:

Mik

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PostPosted: Thu Sep 20, 2018 4:15 am 
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Location: Ottawa, ON, CA
Find a repair shop and drop it off for an estimate.


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PostPosted: Thu Sep 20, 2018 6:35 pm 
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Location: Cranbrook, BC, CA
So i got it out and powered it up. The belt looks ok, maybe.

I gave it a gentle push and the motor started pulling the belt and is running smooth, no strange sounds.


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PostPosted: Thu Sep 20, 2018 9:45 pm 
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Location: Montréal, QC, CA
Kootnuck wrote:
So i got it out and powered it up. The belt looks ok, maybe.

I gave it a gentle push and the motor started pulling the belt and is running smooth, no strange sounds.
Then the problem is the motor, it has a dead spot on the contacts. Common and easy to fix.

But to be 100% sure, you need to test. Have you tested the play function, can you hear music ?

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PostPosted: Fri Sep 21, 2018 7:08 am 
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Location: Cranbrook, BC, CA
I tested it with a tape and it struggles to play it , then it stops.

I can hook it up to my stereo tonight to see if i get music.


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