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
Troubleshooting Tips, continued
Product Symptom Check Action
AUX Power
Supply PCB
Dead Unit R607, R608 Check for open resistors, R607,
R608. VCC to IC601 will be
missing.
AUX Power
Supply PCB
EMI PCB
Fans constantly on,
or not working at all
Dead Unit EMI PCB Check for burnt thermistors
Q603 Q603 may be defective. Replace
if fans are not working properly.
TH601 and TH602. Replace
board if defective.
+/- 27V Power
Supply PCB
Solid amber led, no
audio
Check for +/- 27Vdc
from power supply
boards
One of the power supply boards
may be defective. Using the
chassis as a ground reference,
check for +/- 27Vdc at the blue
and red wires at connectors
CN802, CN806 and CN810 on
the Amp board. If missing from
any of the connectors, check for
visible damage to each of the
power supply boards. If any
components are visibly burnt,
replace board. If not, check caps
C504, C505, C506 and C522 for
visible damage. Replace all 4
caps if found to be defective.
AMP PCB
Audio cuts out at
mid to high volume
Filter caps Check caps C801, C802, C857,
C858, C909 and C910 on the
amplifier board for visible
damage.
AMP PCB
Solid amber led, no
audio
Output IC’s The output IC’s may be
defective on one or more
channels. If defective, replace
both amp IC’s and the
corresponding analog controller
IC located on the amp pcb
bottom directly under the amp
IC’s. Also check filter caps
C801, C802, C857, C858, C909
and C910 for visible damage.
Framingham, MA 01701-9168
SIZE
A
FSCM
32108
CLASS
FM
DWG NO.
302233-TT
SHEET
3 of 3
REV.
00
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