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Aiwa AD-F770

3-Head Stereo Cassette Deck (1983-86)

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Aiwa AD-F770


Offering most of the features of the AD-F990, the sophisticated AD-F770 features Dolby HX professional and DATA circuitry, ensuring sound reproduction that out rivals any other model in its class.

From the all-new flat keyboard control panel to the unique all-mode time display, the AD-F770 is the kind of machine you can depend on for the best in cassette performance.


Type: 3-head, single compact cassette deck

Track System: 4-track, 2-channel stereo

Tape Speed: 4.8 cm/s

Heads: 1 x combination record/playback, 1 x erase

Motor: 1 x reel, 1 x capstan

Tape Type: type I, Cr02, Metal

Noise Reduction: B, C

Frequency Response: 20Hz to 20kHz  (Metal tape)

Signal to Noise Ratio: 60dB  (dolby C)

Wow and Flutter: 0.025%

Total Harmonic Distortion: 1.3%

Input: 50mV (line), 0.3mV (mic)

Output: 0.41V (line)

Semiconductors: 37 x IC, 91 x transistors, 87 x diodes, 19 x LED

Dimensions: 420 x 110 x 280mm

Weight: 5.5kg

Year: 1983


flyer   English -

service manual   English -

B flyer   English -

instruction/owners manual   English Deutsch Francais Italiano Espanol - horsdik

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re: AD-F770

To save any confusion, the shorter belt is motor drive, the longer being flywheels.

re: AD-F770

This is the best deck I have ever owned, bought from new in 1983.
The first thing I did was calibrate it, a cheap deck sounds good when set up properly, this machine was just brilliant. So far in it's life, a set of belts have been fitted, at the same time, the record/playback head was replaced. It is now time for another belt set.
The belt sizes are :- 8 inch, or 64.67mm dia, 8.8 inch or 71.14mm dia.
Anything near will do, when fitted I will re-check the azimuth, tape speed and output levels.
I built a compander some time ago, this compresses 120dB down to 60DdB, then expands on playback. This is used without Dolby, the HX Pro still works on record. The HX system is an active system that turns the bias down on high frequencies when recording, using the cymbals, windchimes or whatever as the bias.
The best test then, will be my BBC single Alpha, by Vangelis. .

re: AD-F770

I have the service manual for the F770, and I haven't been able to find any information relating to the belt dimensions on the machine. I've found some figures here and there, but they all differ from each other. Would be of great help if you could let me know how you settled on the 8 and 8.8 inches dimensions you used please? Many thanks /Pete

Aiwa AD-F770

same lower door issue after replacing belts

Englewolf's picture

Door Issue?

Just picked a 770 today for 10 dollars. Took it apart and obviously needs a belt kit. What do you mean there is a door issue. Talk to ya later. Joe

cassette door ADF 770

After taking deck apart to put on new belts, the cassette door now is about 1/16 inch too low, so cassette will not load on to spindles when attempting to close door.
I put a spacer in bottom of door for cassette to rest on, so it loads OK.
Don't understand how this happened.
Is there any mechanical adjustment for this? Could not find one.

Aiwa F770 Cassette Deck

I am finally copying my cassettes to my computer but the tape door won't open. How do I fix this?

aiwa f770 cassette deck

Does anyone have any input on why on Play the heads and capstans do not raise to engage. Everything else seems to be working fine. Rewind and play motor works ok, and the other processes available for sense the tape bias etc is working but does not report anything, due to the fact the heads do not engage tape on play or sense or even record. If you do know any thing on the topic, is this goingto be a expensive fix or even a fix not assumable to fix due to age and part availability. If service is recommended, where would i send this unit. Obviously AIWA /SONY and age of unit would be tough especially out of warranty. I did download the service manual. Would a compedent service center be able to fix this issue provided parts could be secured. Being ignorant here just asking questions. There are not to many electronic service centers in Western MA except maybe in Chicopee MA.

Thank you for the time and cooperation to reviewing this and advance thanks if you have any input.

thank you for the great return response...

I am very surprised and encouraged with the information replied on regarding my Aiwa F770. Iam concurrently trying to digitize some older educational audio cassettes for my parochial school library and being that the company does not have CD equivalents, I was hoping to utilize the great playback of the unit even though I still from time to time use it to remaster some older cassettes once gone to the wind of better preserve it . Now I am considering whole heartedly to digitize my home collection to CD and or computerized file compatibility. Due to unfortunate timing of tryingto use my Aiwa F770, I had to use an older Sasui tape deck which exuded a hum on playback then even used a old GE Great Escape player which had developed auidble clicking in the playback motor and I had to filer each digital dub with Adobe Soundbooth. When it became noisier, I went back to using a older mom tape player/recorder from Radio Shack which has been archived in my drawers. Since it was momo playback, I used a set of cable to go from one and then split the signal to mono in 2 channel and then insert the audio in as a line in/aux feed on the sound card. I know as needing stereo since playback was originally mono. I then adjusted for hum and rumble then finally got rid of the hiss in the recordings. So far I am pleased, next step is to burn CD's of the wave files of which were recorded in 44,100 1bit stereo or 2 ch mono. then I will master a disc with mp3 quality as a redundant back up to the wave files too. Full project of 46 stories took 3 days of 12 hours each to edit and filter the audio. I will be glad to get the Aiwa deck to work again. It has appreciated in value to the point, it is surely a fineto keep running. I hate having to source one know on eBay. Seems the "educational " org's in USA have forgotten a niche market. Thanks again. I will keep you posted on restoration process. As for the belt replacement if needed, are the belts easy to findf still? I have noted a few sites which sell a multi belt pack.


Bought my 2 new belts at vintage-electronics in Kentucky.

Put them in wrong, put the slightly wider one on motor. Bad. Belts come off after stop then start. Changed to narrower one on motor, works fine. No instructions, so I was guessing.

Only problem I have now, is that for some reason the cassette holder has the cassette too low, so it won't go on to spindles when you close door. Solved it with some spacers in bottom of door, but it was working fine mecahnically before I took it apart, so I can't figure this out.


I inherited one with the same prob. Its hardened grease not letting the heads come up. After some unlubing then some relubing, mines working fine now. Been awhile since I did it, but I seem to recall that there was extensive ish dismantling involved in getting to the affected area, but once able to access the slide arrangement that was sticky it didnt take much to get it free and going.

Head not engaging

Mine was electrical, when I took deck apart to replace belts, one wire at bottom of head unit came loose. Soldered it back on, all worked fine.

aiwa Ad-f770 head base does not engage

You must replace the 2 belts, one from capstan motor to the right capstan wheel, appr. 12,5cm long(fold), width 0.4mm , 0,05mm thickness and the belt between both capstans 11,2cm long(fold), o.4mm width , 0.05mm thickness, since by aiwa AD-F or XK- series the head base can be engaged the tape only with supports of the capstans with gears


My belts were disintegrated, deck had not been used for about 2 years. New belts had one just very slightly wider. I put wider one on motor shaft, it came off every time I stopped and started deck. Switched them, all works fine now.

Isidore Cat's picture

Aiwa AD-F770

It's fantastic: I have found what I looked for: have saved me!

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