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