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TX-SR507 Ref. No. 4121 04, 2009 SERVICE MANUAL AV Receiver MODEL TX-SR507(B/S/G) RC-737M TX-SR507 Black, Silver and Golden models B MDC, B MDD, S MDD, B MDF, G MDF 120V AC, 60Hz B MPP, B MPB, S MPP, S MPB 230V AC, 50Hz B MPA, S MPA B MMO, S MMO, B MMQ, G MMR 220/230-240V AC, 50/60Hz SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. TX-SR507/SR577/DTR-20.1 DEBUG MODE-1 DSP DEBUG MODE-1/3 The operations of DSP and DIR etc are able to be checked by the information displayed on FL with this debug mode. This information will help to analyse no sound trouble of digital audio. To set in Debug Mode and exit 1. Press and hold down DISPLAY button, then press ON/STANDBY button while the unit is powered on. The version number of microprocessor will be displayed. M:1 .04/0 9 3 2 3 a Version of Main Microprocessor F/W *Number depends on the version. 2. Then press + (TONE) button, the version number of DSP will be displayed. D:1.0 1 /09227a 6 7 Version of DSP F/W *Number depends on the version. 3. Press DISPLAY button while the DSP version is displayed. The status of DSP and DIR etc will be displayed. 0 A 4 8 K 0 N/0 FF P o 0 4. Press ON/STANDBY button to exit. Content of Display FL Display 1 2 3 4 5 6 7 8 9 10 11 1 DIR Input Lock / Unlock 4 Sampling Frequency, Emphasis E = UNLOCK 32K = 32 kHz without Emphasis = LOCK 44K = 44.1 kHz without Emphasis 48K = 48kHz without Emphasis