BOSE L1 Schematic

REVISIONS REV DESCRIPTION ENG DATE 00 INITIAL RELEASE BOB SMITH 5/09
SIGNATURES REQUIRED
TSG REPRESENTATIVE BOB SMITH CELL LEAD REPAIR SUPERVISOR OTHER(________________)
TSG TECHNICIAN
Bob Smith
PRINT NAME SIGNATURE
KEVIN KING
DATE
5/09
FRAMINGHAM, MA 01701-9168
CLASS
FM
DWG NO.
302233-TT
APPLICABLE DOCUMENTS:
SERVICE MANUAL: 302233-SM
DESCRIPTION
SIZE
A
L1 Model I System
FSCM 32108
CLASS
FM
DWG NO.
302233-TT
PAGE 1 OF 3
REV
00
Troubleshooting Tips
L1 Model I System
Refer to the L1 Model I System service manual, part number 302233-SM for schematics, PCB layouts and parts lists.
Preventative Repair Measures Note: Perform the following on all units returned for repair.
Product Check Action L1 Model I Power Stand
L1 Model I Power Stand
Product Symptom Check Action L1 Model I Power Stand
AUX Power Supply PCB
AUX Power Supply PCB
REF DES MEASUREMENT EXPECTED READING IN OHMS
D601 (+)ANODE (-) CATHODE 36K OHMS D601 (+) CATHODE (-) ANODE OPEN D605 (+)ANODE (-) CATHODE 30K OHMS D605 (+) CATHODE (-) ANODE OPEN D606 (+)ANODE (-) CATHODE 13K OHMS D606 (+) CATHODE (-) ANODE > 50MEG OHMS D607 (+)ANODE (-) CATHODE 13K OHMS D607 (+) CATHODE (-) ANODE > 50MEG OHMS D608 (+)ANODE (-) CATHODE 13K OHMS D608 (+) CATHODE (-) ANODE > 50MEG OHMS D609 (+)ANODE (-) CATHODE 1.3K OHMS D609 (+) CATHODE (-) ANODE 1.3MEG OHMS
Software Revision Update firmware and EQ presets to latest
revision. Update instructions are located on the service intranet/extranet sites.
Inspect caps for visible damage
Troubleshooting Tips
Low / intermittent audio on one channel Dead unit Connectors CN613
Dead unit Diodes D601, D605,
Channel 1 and 2 input trim pots
and CN614
D606, D607, D608 and D609
Inspect caps C504, C505, C506 and C522 on the +/- 27V Power Supply boards. Check caps C802, C811, C857, C858, C909 and C910 on the amplifier board. Replace if defective.
One of the trim pots may be defective.
There may be solder fractures at connectors CN613 and CN614. Also inspect C610 for visible damage. Using the below table as a guide, de-solder one side of the diodes listed and measure the resistance of each diode.
Framingham, MA 01701-9168
SIZE
A
FSCM 32108
CLASS
FM
DWG NO.
302233-TT
SHEET
2 of 3
REV.
00
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