Bose lifestyle ps 18 28 and 48 268795 troubleshooting
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Page 1
Troubleshooting Tips, continued Product Symptom Chec k Actio n DSP No au dio, soli d ambe r led Y201 Crystal Y2 01 may have failed. Repl ace with part # 256 12 8-00 1. DSP No au dio, led s toggle back an d forth whe n power is a ppli ed. U30 2 and U3 03 Repl ace SDRAM ICs U3 02 and U30 3 with pa rt # 25419 5-0 10. DSP Intermittent Audio J1 If audio cuts out whe n stre ssi ng con nector J1, repla ce conn ector with part # 26 0334 -00 12. Powe r Suppl y Unit ke ep s bl owin g fuse s Q101 a nd Q1 02 Che ck for sh orted FET s Q101 a nd Q102. Only repla ce i f there is no v isible damag e to co ntrolle r IC U1 01an d surro undi ng compon ents. Powe r Suppl y No po we r U10 1 for visib le damag e If U101 is bu rnt, replace po wer sup ply board with part # 28 5837 - 003 Powe r Suppl y No / disto rted audio R20 1 and R2 02 Fusa ble resi stors R201 o r R20 2 may be open. Repla ce with part # 2603 52-100. AMP No po we r Output ICs U1, U2 and U3 If U1, U2, or U3 fails in a PS18, PS28 or PS48 bass mod ule that has am p PCB 266999 -0, repla ce the amp PCB with part nu mber 2673 32-0, wh ich ha s imp roved output ICs. Not e: Th e im proved o utput s ICs U1, U2, an d U3, part nu mber 2673 30-001 are not comp atible with the older a mp PCB part nu mber 2669 99-0. Phase in of the new am p PCB bega n in Novemb er 2003 a nd wa s com plete d in Jan uary 2004. 2
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GROUND REFERENCE +13V -13V +10V -10V +3.3V +5V The above diagram can be used as an aid for measuring the power supply voltages with the unit assembled. SHEET 4 of 4