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Bose 300PM Service Manual
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Bose 300PM Service Manual

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®
®
MODEL 300PM LOUDSPEAKER
Service Manual
©
1997 Bose Corporation
Part Number 193626 Rev. 00

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Summary of Contents for Bose 300PM

  • Page 1 ® ® MODEL 300PM LOUDSPEAKER Service Manual © 1997 Bose Corporation Part Number 193626 Rev. 00...

  • Page 2: Table Of Contents

    Figure 2. Model 300PM Loudspeaker driver wiring diagram ............8 Figure 3. Model 300PM Loudspeaker schematic diagram .............. 9 Figure 4. Model 300PM Loudspeaker Crossover Assembly top side etch layout diagram ... 10 Figure 5. Model 300PM Loudspeaker Crossover Assembly bottom side etch layout ....11 Model 300PM Loudspeaker crossover assembly part list (per figures 4&5) ....

  • Page 3: Specifications

    SPECIFICATIONS External Dimensions: 12.83"L x 8.43"D x 7.25"H (32.6cm x 21.4cm x 18.42cm) Internal Cabinet Volume: 5.7 Liters (347 cu.in.) net Sensitivity (1W, 1m): 83.8dB SPL (calculated), free field, per IEC-268-5 (for octave- band centered at 400Hz). SmartProtect Circuit characteristics: Turn-on voltage of the transistors of the electronic switch: 1.5-1.8 Vrms Turn-on level rise:...

  • Page 4: Smartprotect Crossover Pcb Operation And Troubleshooting

    SmartProtect Crossover PCB operation and troubleshooting Note: Refer to Figure 3. Model 300PM Loudspeaker schematic diagram, for the following information. The SmartProtect PCB is an electronic switch, in series with the drivers, used to protect the drivers from high current levels. It has a fast turn-on time of 100 milliseconds.

  • Page 5: Disassembly/Assembly Procedures

    5. Crossover Assembly removal 2. Grille replacement 5.1 Remove the driver (3) located behind 2.1 Orient the grille (1) so that the Bose ® the curved portion of the grille (1) using logo is aligned with the print on the rear of procedure 3.
  • Page 6 DISASSEMBLY/ASSEMBLY PROCEDURES (CONT.) 6.4 Gently slide the crossover assembly onto the tabs on the binding post connector until it is seated. 6.5 Secure the crossover assembly using the four screws (8) removed in procedure 5. 6.6 Replace the batting removed in procedure 5.2.

  • Page 7: Test Procedures

    Figure 1. Model 300PM Loudspeaker test minimum. setup diagram 3.4 Listen carefully for air leaks along all Note: Refer to Figure 2. Model 300PM glue joints, at the binding post connector, driver wiring diagram for the following and at both transducer mounting locations.
  • Page 8 BLACK BLUE DRIVER Figure 2. Model 300PM Loudspeaker driver wiring diagram...
  • Page 10 Figure 4. Model 300PM Loudspeaker Crossover Assembly top side etch layout diagram...
  • Page 11 Figure 5. Model 300PM Loudspeaker Crossover Assembly bottom side etch layout...

  • Page 12: Model 300Pm Loudspeaker Crossover Assembly Part List (Per Figures 4&5)

    Model 300PM Loudspeaker crossover assembly part list (per figures 4&5) Reference Description Part Number Qty per Designator Assy. Res, Metal Oxide, 1W, 5%, 39KΩ 171259-3935 Res, CF, 1/4W, 5%, 1 MEGΩ 120968-1055 R3, R4, R17 Res, CF, 1/4W, 5%, 20kΩ...

  • Page 13: Model 300Pm Loudspeaker Part List (Per Figure 6)

    Model 300PM Loudspeaker part list (per figure 6) Item Description Part Number Quantity per Number Assembly Grille Assembly, 300PM 187239-001 Screw, Tapp, 8-11x.75,Pan, Xrc/Sq 172672-12 Driver Assembly, Shielded, 4.5” 187246-001 Grommet, Grille Socket 176068 Insert, Threaded, Ext/Intl 121690 Washer, Lock, .326, 5/16, Intl T...

  • Page 14: Model 300Pm Loudspeaker Packing Part List (Per Figure 7)

    Model 300PM Loudspeaker packing part list (per figure 7) Item Description Part Number Quantity per Number Pair Packing, End Cap, 203 187243-001 Bag,Poly, 13.5x33.5x13x3 mil 106595 Carton, RSC, 300PM 187242-001 (2X) Figure 7. Model 300PM Loudspeaker packing diagram...

  • Page 15: Model 300Pm Loudspeaker Accessories

    Model 300PM Loudspeaker Accessories There are three optional brackets that can be used to mount the Model 300PM Loudspeaker that are available through Bose BKK. They are model numbers CB-22, GWS-200, and GBB-1. Note: All measurements are in millimeters; all angles are in degrees.
  • Page 16 SPECIFICATIONS AND FEATURES SUBJECT TO CHANGE WITHOUT NOTICE ® ® Bose Corporation The Mountain Framingham, Massachusetts, USA 01701 P/N 193626 REV. 00 08/97 FOR TECHNICAL ASSISTANCE OR PART ORDERS, CALL 1-800-367-4008...