BOSE 170310 SB1 Schematic

SAFETY BULLETIN

Bulletin Part Number: 170310-SB1

®

Product: 502

Subject: Loose Port Assemblies

Disposition: Perform the steps below on all units built before 11/2000

B, 502BP, 502BE, 502BEX Loudspeakers

Symptom: Air leaks or rattles heard from the 502 bass box.

Reason: One or both of the port assemblies may be loose.

Solution number 1: When a 502 bass box is brought in for service, check for a loose port.

If found to be loose perform the following procedure:

1. Remove the loose port from the 502 bass box.

2. Cut the vinyl back according to figure 1 on the back of this bulletin.

3. Apply glue or adhesive hot melt to a new port. Refer to the table below for the proper

port part number needed.

4. Place the new port onto the bass box.

Solution number 2: For 502 bass boxes that are mounted such that they are difficult to
remove for service, the following procedure can be performed, even if the ports are not
loose:

1. Drill two 1/8" countersink pilot holes through the port only. Refer to figure 2 on the back

of this bulletin.

2. Using #8-18 AB or BP x 1.00" long (cross recess drive, flat countersunk head, self

tapping screw), secure the port to the cabinet.

3. As a precaution, perform this procedure on all 502 bass box ports that are mounted in

hard to access applications.

Description Part Number

PORT ASSEMBLY W/OUT LOGO, GRAY 142354-01
PORT ASSEMBLY W/OUT LOGO, WHITE 142354-02
PORT ASSEMBLY WITH LOGO, WHITE 142354-03
PORT ASSEMBLY WITH LOGO, GRAY 142354-04
PORT ASSEMBLY W/OUT LOGO, BLACK 142354-05
PORT ASSEMBLY WITH LOGO, BLACK 142354-06

ECN: 31710
Date Issued: 5/03

Bose Corporation; The Mountain, Framingham, Ma. 01701-9168

For Technical Assistance Call 1-800-233-4408

Service documentation available on-line at http://serviceops.bose.com

Before

Solution 1: Figure 1. View of Vinyl To Be Removed

After

Solution 2: Figure 2. Location for Drilling Screw Holes