Page 1
Framingham, MA 01701-9168 SIZE
A FSCM
32108 CLASS
FM DWG NO.
318882-TT SHEET
2 of 3 REV.
00
Description
Refer to the L1 Compact Service Manual 318882-SM located on the Bose Service web sites at
http://intranet.bose.com/tsg
or http://serviceops.bose.com for any information not presented in this
document.
1. Preventative Repair Measures
Note: Perform the following on all units returned for repair.
Product Check Action
L1
Compact Check DOM embedded in
product serial number. If the date code is before 7/24/09 (DOM 9205 ), replace
zener diodes Z1, Z2 and Z7 using the rework procedure
outlined in Service Bulletin 318882-B1. These diodes are
located on the Amplifier / Power Supply PCB assembly.
This bulletin MUST be performed on all units that come in
for repair that were built before the above date code.
This bulletin is located on the L1Compact Service web
page at http://serviceops.bose.com
on the Pro Products
page.
2. Troubleshooting Tips
Product Symptom Check Action
L1
Compact Dead unit. DOM of
product. If the date code is before 7/24/09 (DOM 9205 ), replace
zener diodes Z1, Z2 and Z7 using the rework procedure
outlined in Service Bulletin 318882-B1. These diodes are
located on the Amplifier / Power Supply PCB assembly.
This bulletin MUST be performed on all units that come in
for repair that were built before the above date code.
This bulletin is located on the L1Compact Service web
page at http://serviceops.bose.com
on the Pro Products
page.
L1
Compact Excessive
noise floor on
the Channel 1
Mic Input. DOM of
product. If the date code is before 8/18/09 (DOM 9230), replace
resistors R117, R171, R165, R311, R248, R190, R118
and R119 with new values as listed in the rework
procedure outlined in Service Bulletin 318882-B2. These
resistors are all located on the Input/Output PCB
assembly.
This bulletin is located on the L1Compact Service web
page at http://serviceops.bose.com
on the Pro Products
page.
L1
Compact Loud crackling
noise on
channel 2
inputs -“ no
sources
connected. Solder on
D306 on the
amplifier /
power supply
PCB. Channel 2 noise complaint. Unit makes a cracking noise
as if the pot was dirty or if a cord was defective. Occurs
on all channel 2 connectors. With no inputs connected,
unit has very loud crackling noise as soon as channel 2 is
turned up. Re-solder the pins on diode D306. D306 is a
dual diode that clamps the input voltage from the 1/8 jack
to protect the input Op-Amp.
Page 2
Framingham, MA 01701-9168 SIZE
A FSCM
32108 CLASS
FM DWG NO.
318882-TT SHEET
3 of 3 REV.
00
Product Symptom Check Action
L1
Compact Clicking sound.
No audio
output. Check for
failed audio
amplifier IC
U3. Defective Amplifier IC, TDA8920 on Power supply PCB.
Clicking sound is caused by the amplifier detecting the
fault, shutting down and then attempting to restart.
L1
Compact Channel 1
noise.
Intermittent. R149 solder
connections. Channel 1 noisy with no sources connected. Can be
intermittent. Noise fades after about 2 to 15 minutes.
Check R149 for solder issues or failure. This resistor is
located on the Input / Output PCB assembly.
3. Software / Firmware Updates
Not applicable. The L1 Compact is an analog product with no DSP. There is no software or firmware to update.
