Read JBL GTO 601.1 (serv.man9) User Guide / Operation Manual online
7
INSTALLATION AND SETUP
To Neon
Power
Supply
To Neon
Power
Supply
Figure 13. Installing neon tubes in a JBL GTO amplifier.
TROUBLESHOOTING
SYMPTOM
LIKELY CAUSE
SOLUTION
No audio
No voltage at BATT+
Check voltages at
(POWER LED
or REM terminals,
amplifier terminals
is off)
or bad or no ground
with VOM
connection
No audio
DC voltage on
Amplifier may need
(PROTECT LED
amplifier output
service; see enclosed
flashes every
warranty card for
4 seconds)
service information
No audio
Amplifier is
Make sure amplifier
(PROTECT
overheated
cooling is not blocked
LED is on)
at mounting location;
verify speaker system
impedance is within
specified limits (see
“Specifications” on
the next page)
verify speaker system
impedance is within
specified limits (see
“Specifications” on
the next page)
No audio
Voltage less than 9V on
Check vehicle
(PROTECT
BATT+ connection
charging system for
and POWER
defective voltage
LEDs flash)
regulator
SYMPTOM
LIKELY CAUSE
SOLUTION
No audio
Voltage more than 16V
Check vehicle
(PROTECT
or less than 8.5V on
charging system for
LED is on)
BATT+ connection
defective voltage
regulator
regulator
Distorted audio
Input sensitivity is
Check INPUT
not set properly, or
LEVEL setting; or
amplifier or source
check speaker wires
unit is defective
for shorts or grounds
Distorted audio
Short circuit in
Remove speaker leads
and PROTECT
speaker or wire
one at a time to locate
LED flashes
shorted speaker or
wire, then repair
wire, then repair
Music lacks
Speakers are not
Check speaker
“punch”
connected properly
connections for
proper polarity
proper polarity
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