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Old 27th March 2014, 12:45 PM   #1
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Location: SE PA
Default Akai 230D help....

I got this deck last summer, and want to try to use it,, went to hifi engine to download teh manuals, and couldn't get em... So, I opened it up, cleaned all teh hard grease off and relubed it,, replaced the burned out meter bulbs, de-oxed teh switches, and tried it out with some very old 7" tapes,,, It seemed to run them slow, so I recorded over them and tried again,,, I monitored teh recordings as I was making them, and switching between tape and source was seamless.... On playing them back, they seem to run faster than they should,,,

Is there any way to adjust play back speed to match the record speed? I recorded them at 7 1/2...
Thanks in advance for any help, or manuals,,, seems like a good deck, like to use it...

Regards,
John
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Old 27th March 2014, 01:20 PM   #2
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Location: West Australia, straight over the road from the beach, natural ambient sounds only.
Took me all of 10 seconds...AKAI GX-230D SM Service Manual free download, schematics, eeprom, repair info for electronics
You need to clean all plastic deposits off all felt braking surfaces (white art brush cut short), clean all belts and drives and rollers (isopropyl alcohol), if you have rubber drive wheels remove glazed surfaces, and then see what you get.

Ask if you need more help.

Dan.
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Old 27th March 2014, 01:33 PM   #3
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Dan,
Thanks for replying, and the DL,,, I tried to get it from Hi Fi engine, but it must have been taken off...
This deck has 3 direct drive motors, AC, I believe, so no belts, etc,,, I cleaned the pinch roller, and bushing, and relubed it...
I will study the manual, and I may then be able to determine if teh problem is mechanical or electrical...
Thanks again for teh help, I will repost as it progresses...

Regards,
John
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Old 27th March 2014, 03:23 PM   #4
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Re-cleaned and lubed the pinch roller,, still plays the same,,, I'll try to record another tape, and try it again,,, want to see if its a mechanical problem, before making any electrical adjustments/changes....
Regards,
John
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Old 27th March 2014, 06:46 PM   #5
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Update...
I made another recording, and played it back, sounds very good,,, only thing different,,, recorded at 3 3/4 instead of 7 1/2,, and just rewound teh tape, without removing either reel...
I noticed in teh SM, at 7 1/2, the motor is set at 1000Hz, and 500Hz for 3 3/4 ,,, they have separate pots, so its possible the high speed is out... Also, possibly there's a component heating problem on teh servo control board, causing intermittent performance...
Still trouble shooting...
Regards,
John
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Old 27th March 2014, 10:21 PM   #6
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Possible fault - watch out for supply reel back tension being too high.....plastic wears off the supply side drum and embeds into felt band increasing friction.
Art brush cleans the powder out of the felt....remove band and lay flat whilst cleaning.

Dan.
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Old 27th March 2014, 10:33 PM   #7
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Wouldn't any friction make it run slower? I can check the drums/belts next time I open it... I since recorded another tape, and it played back fine,,,
I appreciate the info, and teh manual.... Kinda thinking it has intermittent electrical/component problems... If so, I don't have a scope or frequency counter to re-adjust it, if changes or adjustments need to be made...

Regards,
John
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Old 28th March 2014, 11:06 AM   #8
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Location: West Australia, straight over the road from the beach, natural ambient sounds only.
Operate the tape speed switch a heap of times...usually they have silver plated contacts that can go dodgy with lack of use.

If you don't care about playing pre-recorded tapes, your absolute speed does not actually matter.
I would be wary of touching the speed trim pots, unless you have a suitable speed cal tape, or can reliably tune speed by ear.

Enjoy your new toy....dodgy WF, dodgy FR, dodgy SNR, dodgy THD...when compared to modern digital systems, but hey, they do have a sonic 'character'.

Dan.
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Old 28th March 2014, 11:51 AM   #9
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Dan,,,
I'm recording on tapes I made in 1970!! Maybe I need some new ones? Never had a pre-recorded tape, so recording records/CD's is all I'll ever do,,, was just surprised when I recorded a tape, then played it back and it was running faster,,, Maybe it needed a little "air time" to settle back down??? Caps reforming, lube to get into the works, etc... Sounds really good. I'm playing it now, with tapes I made yesterday,,,
I cleaned the speed switch, along with all teh other slide and micro switches in it,,, No intention of touching teh imbedded pots, as I know I can't reset em without equipment...
Replacing the bulbs in teh meters made a big difference in its appearance, I used series Christmas tree bulbs....
Analog Pink Floyd,,, It doesn't get any better than that...
Regards,
John
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Old 28th March 2014, 12:14 PM   #10
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Location: West Australia, straight over the road from the beach, natural ambient sounds only.
Old tapes can become 'sticky'....binder breakdown that causes oxide shedding and speed variation due to drag across the tape path.
Another cause of perceived speed increase is flutter....short term speed variation....causes are oxide deposits on capstan and tape path, and glazed pressure roller.

If the pressure roller is glazed, it needs to be unglazed.
Remove the roller, fit a close fitting machine screw/nut/washers through the bearing hole and spin it in a battery drill at slowish speed and remove the hardened/glazed surface with medium grade wet and dry sandpaper on a flat surface to restore to soft rubber surface, taking care to keep the roller flat and square.
Clean with isopropyl alcohol and refit.

You can also tie up the sensing/guide arms and just let it run without tape for some hours to allow everything to free up/settle in.

Pink Floyd with added noise and distortion....I always thought there was plenty to start with .

Dan.

Last edited by Max Headroom; 28th March 2014 at 12:20 PM.
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