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Akai GXC-730D

Stereo Compact Cassette Recorder (1976-79)

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Akai GXC-730D

Description

Akai's GXC-730D stereo tape deck features a GX Head forward and reverse recording and playback.

The GX recording/playback head is centrally positioned between two stout capstans for complete stability in both directions.

Automatic and manual playback and recording in both directions, convenient front loading design, and Tape Direction Indicator Lamps offer the ultimate in operating ease.

Specifications

Type: auto reverse, 3-head, single compact cassette deck

Track System: 4-track, 2-channel stereo

Tape Speed: 4.76 cm/s

Heads: 1 x record/playback, 2 x erase

Motor: 4-pole hysteresis synchronous outer rotor

Tape Type: type I, CrO2, FeCr

Noise Reduction: B

Frequency Response: 35Hz to 17kHz  (FeCr tape)

Signal to Noise Ratio: 60dB  (dolby B)

Wow and Flutter: 0.08%

Total Harmonic Distortion: 1.5%

Input: 70mV (line), 0.3mV (mic)

Output: 0.775V (line)

Semiconductors: 56 x transistors, 121 x diodes, 2 x IC

Dimensions: 440 x 175 x 302mm

Weight: 12kg

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Comments

re: GXC-730D Head Azimuth!

Wow this deck is a pain doing adjustments. To align the heads you have to remove front fascia panel no, access holes????? Wow!

re: GXC-730D

Wow tried changing belts, didn't attempt to change the counter belt. Had to figure out there's a bracket that you have to unscrew to change the flywheel one(not sure what its called). A magnetic screwdriver would help alot cause its very congested there. Easier to tip player up to screw the bracket up and down as opposed at its side. Had to run the deck for like 5 minutes after i changed the one belt the smaller belt was the wrong one i used the original or the one that was in it. The deck kept on stopping, auto reversing playing then stopping. Not sure what i did but the time to seat the belts or whatever made it play. Aligning the heads was a pain, u have to take the silver face off to get at the right adjustment screws, even took the door out. Alot of trial and error, but finally got it to play right. Whew!!!!

re: GXC-730D

Hi i cant find any info if you can adjust the tape speed. The service manual is of no help. i played with that rubber wheel in the cassette door compartment if i move it up it plays faster, like the spring is loose. Its frustrating, and theres also a hum when no sound is coming through a song. i changed electrical outlets, no change. Thank you, any help would be appreciated.

re: GXC-730D

Hi Mark,

This model uses an AC motor and there is no adjustment. What percentage is it off by? Is it running too fast or too slow? Did it come from another country where the AC line frequency might have been different?

The hum problem could be anything. You first need to rule out the power supply. Decks of this age will have failing electrolytic capacitors throughout, especially the power supply.

Is the hum only there in playback? If so, try shorting the playback head leads where they connect to the pc board. With any 2 head tape deck, I always start by cleaning the record / playback switch. It can cause all sorts of problems, including hum.

-bob

re: GXC-730D

hi thank you, it s probably the belts, i noticed older cassettes if the tape is tight this deck will almost stop like theres no torque. i have this demagnetizing cassette tape and it barely moves. the hum is only on playback, i noticed when i jimmy the rca cords in back hum is more or less prominent. have u attempted changing belts on this deck, it looks easier theres alot of room inside. Hope i made sense. thanks again.

Mark

re: GXC-730D

Hi Mark,

I have never worked on this mechanism before, so I can only give you general advice. To troubleshoot mechanical problems I always activate the tape transport without a tape in place. You usually need to trick the mechanism into believing there is a tape there. Sometimes the mechanism doesn't need to be tricked. Once you can get it into play, fast forward and rewind, use your fingers to feel the torque that is applied to the take-up and supply reels. Also see if the head base is moving completely and that the pinch rollers have good pressure on the capstan. Since this is an auto-reverse deck, you will need to check both directions.

Poor and intermittent torque on the take-up and supply reels is usually a worn idler pulley, clutch or belt. Low pinch roller pressure is usually a head base that won't move into the play position due to bad grease or something jammed or broken.

As for the hum with the rca jacks, check for a broken solder connection at the jacks.

Hope this helps,

-bob

re: GXC-730D

Para mejorar la calidad de sonido del Akai GXC-730D sugiero sustituir algunos componentes del ampificador del cabezal; En la tarjeta Preamp PC Board:

Para ambos canales igual.

C1=220 uF/25 Volts (100uF/16Volts)
C2=47 uF Tantálio (10/16)
C7=47 uF Tantálio (10/16)
C8=47 uF Tantálio (10/16)
C10=330pF (2.2nF 0.0022uF)
C11=100 pF (1nF 0.001uF)
R11=180 KOhms (120 KOhms)
R66=3.3KOhms (15 KOhms no 1.5 KOhms)

Obtendran mas brillo y mejores graves.

Muy agradecido con quien subio el manual.

re: GXC-730D

I'm trying to replace the belts in my deck. Is there anywhere that gives a step by step installation of these belts without taking it all apart. I don't even see pictures of all three belts in the schematics....or maybe I'm missing something. thanks!!!

re: GXC-730D

Having the same problem. Have you had any luck finding info?

When I got my GXC-730D it was

When I got my GXC-730D it was in pieces in a cardboard box. I now have it reassembled, and am trying to get it fully functional again.

If your tape direction indicator lights are burned out, as mine were, you can build replacements with parts from Radio Shack, you need:

276-0017 5mm High Brightness White LED (Package of 2)
271-153 1k Ohm Metal Oxide Resistors (Package of 2)

Akai GXC-730D plays backwards in reverse

I have just downloaded the service manual and have not begun working on this excellent cassette deck. I suspect the problem may be cleared with a good cleaning and lubrication. Has anyone had this problem of playing sound backwards when in reverse direction playback?

stuthridge's picture

Reverse playback issue

I had the exact same issue. I found that it was due to bad (dirty) connections on SW2 slide switch, which is located on the amplifier board and is the middle switch of the 3 slide switches. I sprayed contact cleaner inside the switch and actuated it several times and the issue was resolved. Did you find this was your issue also? I know your message was left a long time ago, but others may find the solution useful.

GXC-730 Plays Backwards in Reverse

I just looked at the schematics and parts layout and it would appear that there is a lever that moves the head up and down with the change of direction. That lever may be binding, I'd check that while its playing and see if you can move it up or down and it should start playing correctly. If this is the problem lube that lever so it moves easily up and down. That should fix your problem. Tom

GXC-730 Plays backwards in reverse

The first thing I'd check would be the head, see if it's a 2 channel or 4 channel head, if it's a 2 channel the the head is not repostioning itself for reverse play. If it's a 4 channel head there would be a relay that switches to the other set of channels in the reverse mode. I've never seen this unit so this is my best guess. I may be way out of the ball park but I'm just trying to help. Tom

Service manual download...nice!!

no technical data? freaking schematics what more do you need? specs are found other places I needed to know how this thing is wired and designed, I have a no power up and found out there is a switch for 220/110 (I figured that the broken thing was a switch but it's nice to know it's not a shorting lug) that is broken.
I can now fix this thing that was found on the curb!!! fools, it's a nice deck, I can't wait to get it rolling again!!!

Akai GXC-730D, service manual

There is no technical data :(

Akai GXC-730D, service manual - There is no technical data

It a standard service manual, I downloaded it, printed it, and used it to repair & service my Akai GXC-730D. It provides all the information needed to service and repair the unit. I cannot understand your statement "There is no technical data", that's all it contains!

Jim Simmons

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