Bose AV28 Manual page 26

8.0 LS28/35 Bass Module Issues
The LS28/35 bass module is sold as a system with the AV28 media center and is mentioned for
reference. Refer to the Lifestyle
manual part number 264562.
8.1 LEDs
The amber and green LEDs on the DSP board serve to provide information about the status and
operation of the speaker's DSP board. The following is a summary of the various possible states of
the LEDs and a functional description of the state(s) represented.
•
Green LED: The green LED serves a dual purpose: general system health and serial data
received. The green LED will blink once per second with a 50% duty cycle (i.e. on for ½ second,
off for ½ second) if the system booted and is running normally. If the unit is in the SmartSpeaker
"Off" condition, the green LED will blink briefly (approx. 0.1s ON time) once every 5 seconds.
• The green LED will also toggle whenever a serial data byte is received. This will interrupt the
normal 1-second blink rate. The green LED blinking faster than 1 Hz usually indicates that it is
receiving serial communications.
• Amber LED: The amber LED serves to signal 3 conditions: power applied/boot status, S/
PDIF status and clipping status. When power is first applied the amber LED will light briefly. If the
PROM FLASH checksum is incorrect or hardware does not pass power-on self test, the green
LED and amber LED will alternately blink at approx. a 5 Hz rate. If the green LED is blinking at its
normal, 1 Hz rate, a blinking, 1Hz amber light indicates that there is no valid S/PDIF signal present:
If the amber LED is off while the green LED is blinking normally, then valid S/PDIF is present and
being received. Finally, the amber LED will briefly blink (in this case, only when valid S/PDIF is
present) when the satellite amps are clipping. This should only occur when playing the system at
extremely high levels.
8.2 DIP Switches
The LS28/35 bass module has a set of four DIP switches, accessible from the back connector
area. Three of these switches (switches 1, 2 and 3) set the Room Code of the speaker, and must
match the three Room Code DIP switches on the remote control (switches 7, 8 and 9) used with
that speaker. Switch 4 on the speaker is only used in manufacturing/test to enter TAP mode, and
should nominally be left DOWN.
9.0 Legacy Speaker Issues
9.1 Protocol Setup
The AV28 media center supports legacy (existing) Bose
1 and Zone 2. However, these systems (AM25P/30P II digital bass module and LSA) require the
console to send control commands using the older CD-5 Serial Data Port Protocol, which is NOT
the default smart speaker protocol used by AV28 media center. To enable this older protocol, the
user must use the OSD (Settings/Setup) menus to change either the Zone 1 Speaker Protocol or
Zone 2 Speaker Protocol from "Normal" to "Legacy" mode.
Theory of Operation
®
28 and 35 Digital Acoustimass
26
®
Powered Speakers service
®
powered speaker systems in both Zone