Sony HB-F1XDJ, no speed controller

By Alexandre_Taito

Champion (322)

Alexandre_Taito's picture

18-08-2018, 03:11

Greetings ALL

Got a XDJ as a nice gift from a friend. Had various problems, all solvered, but when I closed it I saw the speed controller wasnt working - It worked "on" and "off". But no speed reduction.

The speed controller has two parts - one is a switch (!) on the potentiometer which turns on a pair of flip-flops to divide the /VINT signal and use as a visual aid to control speed.

The other part is a resistor, the potentiometer and a capacitor from +5V to one of the pins of a Sony IC. Scoping it I can see a sawtooth with width controlled by the potentiometer. But CLK does not varies from 3.58

Also, there is no XDJ service manual. I tried to guide myself using the XD manual but the speed controller is a different chip.

Unfortunately, no XDJ around to compare, so I ask if any of you has experience repairing/understanding the speed controller circuit.

Something I found strange: The amplitude of the sawtooth is less than a volt. It shouts me the input pin is toast.

Thanks!

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By Meits

Scribe (5177)

Meits's picture

18-08-2018, 03:49

No experience at all, but there's yet another machine you could try and compare it with. The HB-F1XV. The younger sister of the HB-F1XDJ. Supposedly with some "bugs" fixed.

By gdx

Prophet (2310)

gdx's picture

18-08-2018, 08:12

Check the three-wire cable. It seems that it can be cut by dismantling the machine.
The service manual of HD-F1XD is available. This MSX2 has also a speed controller. Maybe It can help you.

http://msx.hansotten.com/uploads/xfiles/sonyhbf1xdsm.pdf

By Alexandre_Taito

Champion (322)

Alexandre_Taito's picture

19-08-2018, 00:22

gdx wrote:

Check the three-wire cable. It seems that it can be cut by dismantling the machine.

What 3 wire cable are you talking about? If you're talking about the 5 wire of the potentiometer board, it was the first thing checked. And also, with an interrupted wire, there would be no sawtooth.

By gdx

Prophet (2310)

gdx's picture

19-08-2018, 04:30

I read it here.

Quote:

2. トップカバーを浮かせて、スピードコントロールと連射ターボのボリューム、各種インジケータのケーブル計 3本を切らないように注意しながら外し、トップカバーを外す

Google translation: Lift the top case, remove it carefully so as not to cut the total of 3 cables of speed control, fire turbo volume, various indicators, remove the top case.

By Alexandre_Taito

Champion (322)

Alexandre_Taito's picture

23-08-2018, 01:39

Ah, isnt the three-wire cable, but the three cables of wire Smile

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