Troubleshooting; Specifications - JBL Loud + Clear LC-A504 User Manual

A m

Troubleshooting

Symptom
No audio (power indicator is on).
No audio (power indicator is off).
No audio (power indicator is off,
voltage at terminal OK).
Distorted audio.
Music lacks "punch" .

Specifications

Power Output, 4 Ohms
Power Output, 2 Ohms
Power Output, 4 Ohms Bridged
Frequency Response
Input Sensitivity
THD + Noise
Signal-to-Noise Ratio
Maximum Current Draw
Dimensions (H x W x D) 2-5/16" x 8-5/16" x 7-9/16"
(58mm x 217mm x 191mm)
JBL Consumer Products
250 Crossways Park Drive, Woodbury, NY 11797
8500 Balboa Boulevard, Northridge, CA 91329
1-800-336-4JBL (4525) (USA only)
www.jbl.com
© 1999 JBL, Incorporated
JBL is a registered trademark of JBL, Incorporated.
Part No. LC-AMPOM 3/99
R ECY CL A BL E
p l i
Likely Cause
Speakers or input-signal cables disconnected;
defective speaker or source unit.
No voltage at BATT or REM terminals;
bad ground connection.
Amplifier protection is engaged due to
overheating; shorted or defective speaker
or speaker cable.
Input sensitivity not set properly; amplifier
or source unit defective.
Speakers are not connected properly.
LC-A502
50W x 2
65 W x 2
130W x 1
20Hz – 40kHz
250mV – 4V
.10%
90dB
>
20A
2-5/16" x 8-5/16" x 12-1/2"
(58mm x 217mm x 317mm)
f i
LC-A752
75W x 2
90W x 2
180W x 1
20Hz – 40kHz
250mV – 4V
.10%
90dB
>
26A
2-5/16" x 8-5/16" x 11-5/8"
(58mm x 217mm x 297mm)
e r
Solution
Check connections, source, speakers.
Check voltage at amplifier terminals
with VOM. Repair faulty connection.
Disconnect speaker leads one at
a time to determine which speaker
or wire is shorted or defective.
Repair the short circuit or replace
bad speaker.
Check LEVEL setting; check source
unit.
Check speaker connections
for proper polarity.
LC-A304
30W x 4
37.5W x 4
75W x 2
20Hz – 40kHz
250mV – 4V
.10%
90dB
>
23A
2-5/16" x 8-5/16" x 14-1/16"
(58mm x 217mm x 357mm)
s
LC-A504
50W x 4
62.5W x 4
125W x 2
20Hz – 40kHz
250mV – 4V
.10%
90dB
>
42A