Bose av28 troubleshooting 264563 tt

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Framingham, MA 01701-9168 SIZE A FSCM 32108 CLASS FM DWG NO. 264563-TT SHEET 2 of 3 REV. 01 Troubleshooting Tips Lifestyle AV-28 Media Center Refer to the Lifestyle AV-28 Media Center service manual, reference number 264563-SM for schematics, PCB layouts and parts lists located on service web site. Preventative Repair Measures Note: Perform the following on all units returned for repair. Product Check Action AV28 Media Center C839 on main pcb On all units with a date code before 2200 that come in for repair, inspect the orientation of C839 located on the main PCB. The negative (marked) lead of the capacitor should face toward J102 and away from Y700. If it doesn't, remove surface mount electrolytic capacitor C839 and install a new part (part number 256772-331A) in the direction indicated. Refer to service bulletin 264563-B3. AV28 Media Center J104 on tuner pcb Check for solder fractures. AV28 Media Center Software revision Update to latest revision AV28 Media Center CD/DVD power cable Replace on all units. Part # 304996-265. Refer to service bulletin 271000-B4. AV28 Media Center DVD drive part number. Refer to service bulletin 264563-B5. USA units built between 6/3/02 and 9/12/02 should be checked for the presence of DVD drive part number 266439-001 (DOM range 2190 - 2255). If a DVD drive part number 266439-001 is found in an AV28 media center, the drive must be replaced. Troubleshooting Tips Product Symptom Check Action AV28 Media Center No Power Solder fracture on J104 on tuner pcb Repair fractured solder joint. AV28 Media Center No Power FB1 on tuner pcb, refer to service bulletin 264563-B2. If the resistance measurement is greater than 1.00 ohm or there is any sign of physical damage to the part, replace FB1 part number 256116-181. AV28 Media Center No Power Check for 12V, 5V and 3.3V at switching power supply ICs U302 (tuner pcb), U802 and U803 (main pcb). Check the power supply for the 12V, 5V, and 3.3V at switching power supply IC's U802, U803 and U302 pins 2 and 3. If any of the voltages are not present first check to see that the input voltage 33VDC is present at pins 8 and 9. If the input voltage is there replace the corresponding IC with part # 193486-001. AV28 Media Center No Power C301 and C310 on tuner pcb Check for solder fractures. AV28 Media Center Unit has power, but will not boot up CD/DVD drive Occasionally a software issue with the CD/DVD drive will cause the unit not to boot up. Attempt to power the unit on with a test drive, replace if defective.

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Framingham, MA 01701-9168 SIZE A FSCM 32108 CLASS FM DWG NO. 264563-TT SHEET 3 of 3 REV. 01 Troubleshooting Tips, continued Product Symptom Check Action AV28 Media Center No Display Q101 Check for shorted transistor Q101 on main pcb. Part # 260354-001. AV28 Media Center No dialogue from left and right channels when in 5 speaker mode. Flash IC U2 on main pcb If resetting the console and the bass module does not correct this issue, replace flash IC U2. Part # 307513. AV28 Media Center Unit has power, but will not boot up Flash IC U2 on main pcb, If all power supply voltages are present and a test CD/DVD drive does not work, flash IC U2 may be defective. Replace IC part # 307513 if defective. AV28 Media Center No audio, no remote response Check for 10V at U302 pin2 on tuner pcb. If the +10V is not present U201 on main pcb may be internally shorted to ground through pin 3. Lift the pin to see if the 10V comes back. If U201 is not shorted, the following components on the main board also use the 10V supply: U204, U205, U305, U405 and U504. AV28 Media Center No Video Check for 8Vdc at VR1 pin 4 on main pcb If the 8V supply is missing, check for shorted cap C627 on bottom side of main pcb. AV28 Media Center No audio from Zone 1. Check Zone 1 protocol setting on display menu. If Zone 1 protocol is set to legacy, there will be no audio from Zone 1. AV28 Media Center No audio from Zone 1. R342, R341, R340 and T301 on main pcb. Using an oscilloscope, check for a SPDIF signal at pins 1 and 2 of din connector J301. If the signal is not present check U306 pin 26. If the signal is coming out of U306 check the following components for open: R342, R341, R340 and T301. 9-Pin Din, Pin Location To measure T301, check for continuity between pins 1 and 4, and pins 5 and 8.