Bose companion 3 troubleshooting tips
This is the 3 pages manual for bose companion 3 troubleshooting tips.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from bose companion 3 troubleshooting tips (Ocr-read)
Page 1
Framingham, MA 01701-9168 SIZE A FSCM 32108 CLASS FM DWG NO. 271885-TT SHEET 2 of 3 REV. 01 Troubleshooting Tips Companion® 3 Multimedia Speaker System Refer to the Companion® 3 Multimedia Speaker System service manual reference number 271885-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 Companion 3 Four capacitors must be replaced on all systems built before DOM 5315, and regardless of symptom. Replace C316, C317, C318 and C319 with part number 286499-104. This change will prevent possible DC offset voltages due to a cracked capacitor. Refer to Service Bulletin: 271885-B3 and the Companion® 3 Service Manual part number 271885-SM for disassembly/assembly. Companion 3 Units built before 10/23/2007 (DOM 7289). Units built before 10/23/2007 will have the Aishi capacitor C7 installed on the power supply PCB. Replace C7 with a United Chemi-Con (UCC) capacitor. Refer to the service manual for the part number. The DOM cut-in date only applies to U.S. variants. Refer to Service Bulletin: 271885-B4 for further information. Companion 3 On the early version PCB 271838-001, Replace Q303 on all repairs Replace Q303 with part number 148770. Add a 1N4148 diode part number 121501 across the base emitter junction. Polarity is very important. Connect the cathode of the diode to the base and the anode to the emitter. Also replace R336 with part number 133625-10R0. Refer to Service Bulletin: 271885-B2 for component location and placement. Troubleshooting Tips Product Symptom Check Action Companion 3 Intermittent Power Either J308 or the control pod itself can be defective Use a test control pod to identify if whether the problem is with the customers control pod or the connector J308. If the test control pod works, the problem can be identified as the customer having a defective control pod. If the control pod does not fix the problem, J308 is the failed component. J308 is not repairable. The module assembly would have to be replaced. Refer to the Service Manual for the module assembly part number. Companion 3 Intermittent Power Check J1 Sometimes J1 is not seated properly and may become intermittent. If J1 is intermittent, the cable may need to be replaced or reseated.
Page 2
Framingham, MA 01701-9168 SIZE A FSCM 32108 CLASS FM DWG NO. 271885-TT SHEET 3 of 3 REV. 01 Troubleshooting Tips, continued Product Symptom Check Action Companion 3 No Audio Check U301 Check pins 6 and 20 for 15Vdc. If the 15Vdc is not present, then check all other power supply voltages. If the power supply voltages are present, inject a 1KHz signal into J302. Check pins 14 (right in) and 15 (left in) and then pins 17 (right out) and 21 (left out). If audio is coming in and nothing is going out, replace U301 Companion 3 No Audio Make sure the unit isn't stuck in standby At IC U301, place your positive probe on pin 22 and the negative probe on ground. Toggle the control pod between mute and standby by touching the top of the control pod. When the LED is green, the voltmeter should read 11Vdc. When the LED is yellow, the voltmeter should read 0Vdc. Companion 3 No Bass Check U3 Insert a 200 mVrms, 200Hz signal into J302. Check U3, pin 10 for a signal going into the IC and check pin 14 for the signal coming out. If there is a signal going in but nothing coming out, replace U3 using the part number in the Service Manual. Companion 3 Intermittent Audio from Left or Right Speakers Check J307 With the speakers connected and an audio source playing, wiggle the speaker connections and listen to see if the audio cuts out or becomes intermittent. Before determining the connectors as a failure, be sure to inspect the speaker cable for broken or intermittent connections. J302 is non- repairable; Replace the module assembly. Companion 3 No Power Check F1 Using a multimeter, check F1 for continuity. If the component is defective, replace the fuse with a 4amp, 125V, Slo-blow fuse. Companion 3 No Power Check the transformer At the head of the connector on the transformer, check the red and black cable paired together for continuity. Then check the white and black cables paired together. If either pairs fail the continuity test, replace the transformer. Reference the Service Manual 271885-SM and refer to Service Bulletin 271885-B1 for the placement of the new transformer.