Bose t1 tonematch troubleshooting tibose ps

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Framingham, MA 01701-9168 SIZE A FSCM 32108 CLASS FM DWG NO. 296137-TT SHEET 2 of 2 REV. 01 Troubleshooting Tips T1 ToneMatch Audio Engine Refer to the T1 ToneMatch Audio Engine service manual reference number 296137-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 T1 N/A There is no preventative maintenance for this product. Troubleshooting Tips Product Symptom Check Action T1 Dead Unit 1. External power supply, if used. 2. Ethercon cable. 3. Check +/- 18VDC. 4. RJ45 jack. 5. LCD display ribbon cable. 1. Try using another external power supply. 2. Check ethercon cable for damage. Also try another cable. 3. Verify +18VDC on pin 4 and -18VDC on pin 7 of the T1 RJ45 connector. Pins 5 and 8 are GND. Also check F1/R611 and F2/R612 to ensure that they are not open. Refer to the T1 schematic, sheet 1 for more information. 4. Visually inspect the RJ45 connector on the T1 for damaged pins. If a user tries to plug a ¼ phono jack into the connector, they could damage the pins. 5. Verify that the LCD display ribbon cable is fully seated at CN500 on the main PCB. T1 Power cuts out Firmware revision level Check the firmware revision level using the Procedure in the service manual. Update if needed. T1 Blue Screen on display. or No display. Display locked. No control. 1. LCD display ribbon cable. 2. Button function. 3. Main PCB defective. 1. Verify that the LCD display ribbon cable is fully seated at CN500 on the main PCB. 2. Press the MUTE, FX MUTE and CH EDIT buttons on and off to see if they light and go back out again. If they do, check the LCD display ribbon cable to make sure it is fully seated at CN500 on the main board. If OK, try a new LCD display board. If that does not help, then the problem is on the main board. 3. Main PCB etches could be defective. Replace board or entire unit. T1 Intermittent audio Input/Output connectors. Check the connector for the affected channel on the I/O board. Check for fractured solder joints or a broken connector.