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703-C
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DSL100
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Montgomery Ward
VALCO 62-9033
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Peavey
6505+
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CLASSIC-30
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Selmer
LITTLE GIANT MK 3
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Vox
AD50VT
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VALVETRONIX
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Keyboards
Akai
MPC2000XL
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E-Mu
VINTAGE KEYS
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Ensoniq
SQ-2
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Farfisa
MINI COMPACT
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Korg
01/W
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KARMA
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KRONOS
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M1
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POLY-61
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TRITON
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SV-1
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TRITON
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X3
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X3
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KEYS & CONTACTS
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Kurzweil
PC88
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M-Audio
KEYSTATION
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Moog
MICROMOOG
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MINIMOOG
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PRODIGY
• key contact cleaning
ROGUE
• broken power jack
Roland
D-50
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JUNO-60
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JUNO-106
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TR-808
• cracked ribbon cable
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Sequential Circuits
PRO-ONE
• key contact cleaning
Vox
CONTINENTAL
• key contact cleaning
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Yamaha
DGX-530 / YPG-535
• no sound
MOTIF 6 & 7
• disassembly
MOTIF 6 & 7
• worn-out buttons
SY77
• battery change
KEYS & CONTACTS
• motif 6/7, w5, kx76,
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Technique
• IC Sockets
• Phone Plugs

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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