Technics ST-G30E Service Manual page 23

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6.SMPS P.C.B. is connector (P1704) is alternating current present?
(Does P1704 1pin – 4 pin current 12.5 Vtyp? )
NG Disconnect cable (SMPS P.C.B. P1704 - Main P.C.B. P3008 ) and recheck again the voltage.
OK NG: Replace SMPS P.C.B.
Connect again the cable, check for poor contact of the
cable.
OK NG: Replace cable
Replace Main P.C.B.
OK
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