When the dcc130 plays the A side of analog cassettes, the sound is not smooth

dcc130 is normal to play dcc cassettes A/B both sides, and it is normal to play B side of analog cassettes,
but when playing A side, the sound in the earphone is not smooth enough, that is,the sound is trembling, there is a dragging noise at the end of the sound, which is probably What is the reason?
Has anyone encountered this? Thanks!
I have replaced the new belt and new capacitors.

I tried to flip the analog cassette and put it into the dcc130. I found that the A side of the cassette is normal, and the sound of the B side is not smooth enough, so I guess that the dcc130 is not running smoothly in the FWD direction, but I don’t know the specific Where is the problem with the parts or parts, I will try to disassemble the running structure, clean it first and try again.

Apart from playing ACC’s as little as possible in the DCC recorders, have you tried it with an other ACC? How many have you tried? I presume everything is pristine clean?

-Philip.

Have you checked if one the pinch rollers maybe has a dent? This can happen if the player was stored in the play position for a long time.
Regards, Erik

Thank you for your reply.
I tried 2 ACCs, no matter whether they are inserted forward or backward, the sound from the FWD direction of the player is always a little shaky.
I cleaned all the grooves in the swivel pulleys on the belt path and replaced the pinch roller in the FWD direction, and the tremor is less, now there is very very slight trembling, but I can still hear the FWD Different from REV.
I now think it might be the cause of the heads.

Thank you for your reply.
You’re right, there is a very slight dent on the pinch roller in the FWD direction.
I replaced the pinch roller in the FWD direction and cleaned all the grooves of the swivel pulley in the belt path,the trembling is less, now there is just a very, very slight trembling, but I can still hear the difference from REV and FWD.
I now think this might be the cause of the header.

In my opinion and experience what you hear is a belt problem.

It is very difficult nowadays to get working belts for the portables.
I have been plagued with belts from different ebay sellers which caused various malfunctions.

One seller delivered a 0.5 mm belt of undisclosed lenght. This one could not deliver enough torgue to play old ACC or to change directions.

The other seller delivered a 0.8mm belt of undisclosed lenght. This one produced the flutter effect of different amounts on A or B side which I assume you described with your words being “trembling” on analog casettes.
It,s some kind of mechanical “swinging” or oscillation which reminds me
a bit to the chalk on a cardboard but this time plastic against plastic.

Both belts have been sold for DCC130/170
This is in my opinion due to the very much higher stress on the plastic bearings of the mechanics with the thicker 0.8mm belt.
It is probably a one mm longer belt needed when using 0.8mm belts.
What we have here is an old panasonic portable mechanic. The later ones used two belts for same functions.

I have to try 0.6 *64mm belts but am still looking for a source.

Wish you good luck and solution !

thank you for your reply.
The belt factor does need to be considered. I replaced it with a 0.7/φ63mm one from a website in Portugal. I didn’t measure its actual size because I don’t have a vernier caliper. I also bought some 0.8/φ63 belts, but I haven’t received them yet, I will test them again when I receive them.

Thank you for your reply,

Concerning belts I suggest to avoid belts which appear much shorter than the old ones. These when at same time are 0.8 will produce the flutter effect. This I had to learn when changing several times at my DCC170,s. There are specialised sellers which I assume have experience with the panasonic drives which are exept head and electronics identical to the DCC drive Units. I tried fixyouraudio.com.

I learned that the 130 ist much more tolerant to wrong belts than the 170.

Other Problems are the 100% necessity to change the electrolytics in the 130. I suceeded when replacing it to Standard non smd types. This also fixed the blown fuse Problem at the upper board. Only the smallest parts with much care in soldering will fit only in the DCC130, not in the other portables.

On the lower board some trough solders will be damaged when the board must be bent when removing it or damaged by electrolytics of the single condenser of the lower board. In this case a Jumper wire has to be added (see Forum)

Beside that I had to cut and solder the battery wires because the plug refused to open.

I hope this helps to avoid „destroying your 130 at the beach „

Bye Michael

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