Read JBL LC-A 304 (serv.man2) User Guide / Operation Manual online
©
1999 JBL, Incorporated
JBL is a registered trademark of JBL, Incorporated.
Part No. LC-AMPOM 3/99
R E C Y C L A B L E
A
m
p
l
i
f
i
e
r
s
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 11-5/8"
(58mm x 217mm x 297mm)
LC-A504
50W x 4
62.5W x 4
125W x 2
20Hz – 40kHz
250mV – 4V
.10%
>
90dB
42A
2-5/16" x 8-5/16" x 14-1/16"
(58mm x 217mm x 357mm)
LC-A502
Specifications
Power Output, 4 Ohms
50W x 2
Power Output, 2 Ohms
65 W x 2
Power Output, 4 Ohms Bridged
130W x 1
Frequency Response
20Hz – 40kHz
Input Sensitivity
250mV – 4V
THD + Noise
.10%
Signal-to-Noise Ratio
>
90dB
Maximum Current Draw
20A
Dimensions (H x W x D)
2-5/16" x 8-5/16" x 7-9/16"
(58mm x 217mm x 191mm)
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 12-1/2"
(58mm x 217mm x 317mm)
Troubleshooting
Symptom
Likely Cause
Solution
No audio (power indicator is on).
Speakers or input-signal cables disconnected;
Check connections, source, speakers.
defective speaker or source unit.
No audio (power indicator is off).
No voltage at BATT or REM terminals;
Check voltage at amplifier terminals
bad ground connection.
with VOM. Repair faulty connection.
No audio (power indicator is off,
Amplifier protection is engaged due to
Disconnect speaker leads one at
voltage at terminal OK).
overheating; shorted or defective speaker
a time to determine which speaker
or speaker cable.
or wire is shorted or defective.
Repair the short circuit or replace
bad speaker.
Distorted audio.
Input sensitivity not set properly; amplifier
Check LEVEL setting; check source
or source unit defective.
unit.
Music lacks "punch".
Speakers are not connected properly.
Check speaker connections
for proper polarity.
LC-Amplifier OM 3/4/99 10:55 AM Page 1
