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PRO-ONE
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CONTINENTAL
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Yamaha
DGX-530 / YPG-535
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MOTIF 6 & 7
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SY77
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KEYS & CONTACTS
motif 6/7, w5, kx76,
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Technique
• IC Sockets
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Yamaha® DGX-530 and YPG-535 View
the
Repair
Symptoms — "Lights, no sound"
DGC-530

The DGX-530 and YPG-535 models by Yamaha® are virtually identical instruments.  This particular DGX-530 had all its lights, buttons, and display functioning properly but there was no sound from the built-in speakers or the phones output.

C207 on AM board

The speakers and phones are driven by an audio amplifier IC, the LA4625.

An electrolytic capacitor connected to pin 2 of this chip was faulty, causing the IC to shut down.

Result:  Lights, no sound.

 

The troublesome capacitor is designated C207 in the above photo and also in the following schematic, showing the pinout of the LA4625 chip.

4625 pinout

 

The following PDF file is a full schematic of the "AM" circuit board, containing the DGX-530/YPG-535 power supply and audio power amp:

 

PDF YAMAHA® AM Board Schematic  

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