INFINITY 1300a CAR AMPLIFIER TROUBLE SHOOTING AND CIRCUIT DIAGRAM
Contents of this article
- Crossover setting
- Troubleshooting
- Schematic Diagram
CAR AMPLIFIER
INFINITY 1300a
TROUBLE SHOOTING AND CIRCUIT DIAGRAM
SETTING THE CROSSOVER
Determine your system plans and set the crossover-mode switch accordingly. If your system design does not include a subwoofer, set the crossover mode to FULL and skip to “Setting Input Sensitivity.” If your system includes a subwoofer, set the crossover mode to HP (high-pass) for your full-range speakers. Adjust the crossover frequency to limit bass, and provide increased system volume with less distortion.
Mode Switch:
Full: Allows a full-range signal through to the speakers; can be used with larger full-range speakers such as 6" x 9"s.
HP: Allows a high-pass signal through to the speakers; should be used with most loudspeakers (can protect your full-range speakers from being overdriven with low frequencies, one cause of speaker damage).
LP: Allows only bass to pass through to the speakers; should be selected when powering subwoofers.
High-Pass Filters: Initially set the crossover frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowing them to reproduce as much bass as possible. Low-Pass Filters: For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer. If using the 475a to drive a subwoofer, set the crossover mode to LP (low-pass) on the channels connected to the subwoofer.
Determine your system plans and set the crossover-mode switch accordingly. If your system design does not include a subwoofer, set the crossover mode to FULL and skip to “Setting Input Sensitivity.” If your system includes a subwoofer, set the crossover mode to HP (high-pass) for your full-range speakers. Adjust the crossover frequency to limit bass, and provide increased system volume with less distortion.
Mode Switch:
Full: Allows a full-range signal through to the speakers; can be used with larger full-range speakers such as 6" x 9"s.
HP: Allows a high-pass signal through to the speakers; should be used with most loudspeakers (can protect your full-range speakers from being overdriven with low frequencies, one cause of speaker damage).
LP: Allows only bass to pass through to the speakers; should be selected when powering subwoofers.
High-Pass Filters: Initially set the crossover frequency control midway. While listening to music, adjust the crossover for the least perceived distortion from the speakers, allowing them to reproduce as much bass as possible. Low-Pass Filters: For subwoofers, choose the highest frequency that removes vocal information from the sound of the subwoofer. If using the 475a to drive a subwoofer, set the crossover mode to LP (low-pass) on the channels connected to the subwoofer.
SETTING INPUT SENSITIVITY
1. Initially turn the INPUT LEVEL control(s) to the minimum (counterclockwise) position.
2. On the source unit, increase the volume control to 3/4 volume. Slowly increase the INPUT LEVEL control toward three o’clock until you hear slight distortion in the music. Then reduce the INPUT LEVEL slightly until distortion is no longer heard.
NOTE: After the source unit is on, blue LEDs (on the top panel) will light, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to “Troubleshooting.”
REMOTE LEVEL CONTROL
1. Initially turn the INPUT LEVEL control(s) to the minimum (counterclockwise) position.
2. On the source unit, increase the volume control to 3/4 volume. Slowly increase the INPUT LEVEL control toward three o’clock until you hear slight distortion in the music. Then reduce the INPUT LEVEL slightly until distortion is no longer heard.
NOTE: After the source unit is on, blue LEDs (on the top panel) will light, indicating the amplifier is on. If not, check the wiring, especially the remote connection from the source unit. Also refer to “Troubleshooting.”
REMOTE LEVEL CONTROL
The 1300a, 1600a and 5350a include a remote level
control. This will allow the subwoofer level to be adjusted from the listening
position. Connect the remote level control using the RJ11 jack on the side of
the amplifier. Install the control module in the front of the vehicle within
easy reach of the driver. Both the underside of the dash and the center console
are suitable locations.
TROUBLESHOOTING
# PROBLEM: No audio (POWER LED is off).
CAUSE and SOLUTION: No voltage at
BATT+ and/or REM terminals, or bad or no ground connection. Check voltages at
amplifier terminals with VOM.
# PROBLEM: No audio (PROTECT LED glows red).
# PROBLEM: No audio (PROTECT LED glows red).
CAUSE and SOLUTION: DC
voltage on amplifier output. Amplifier may need service; see enclosed warranty
card for service information.
# PROBLEM: No audio (PROTECT LED glows red).
# PROBLEM: No audio (PROTECT LED glows red).
CAUSE and SOLUTION:
Amplifier is overheated. Make sure amplifier cooling is not blocked at mounting
location; verify that speaker-system impedance is within specified limits.
# PROBLEM: No audio (PROTECT LED glows red).
# PROBLEM: No audio (PROTECT LED glows red).
CAUSE and SOLUTION: Voltage less than 9V on BATT+
connection. Check vehicle charging system.
# PROBLEM: No audio (PROTECT LED glows red).
CAUSE and SOLUTION: Voltage greater than 16V or less than 8.5V on BATT+ connection. Check vehicle charging system.
# PROBLEM: Distorted audio.
CAUSE and SOLUTION: Input sensitivity is not set properly, or amplifier or source unit is defective. Check INPUT LEVEL setting, or check speaker wires for shorts or grounds.
# PROBLEM: Distorted audio (PROTECT LED glows intermittently).
CAUSE and SOLUTION: Short circuit in speaker or wire. Remove speaker leads one at a time to locate shorted speaker or wire, then repair.
# PROBLEM: Music lacks “punch.”
CAUSE and SOLUTION: Speakers are not connected properly. Check speaker connections for proper polarity.
# PROBLEM: No audio (PROTECT LED glows red).
CAUSE and SOLUTION: Voltage greater than 16V or less than 8.5V on BATT+ connection. Check vehicle charging system.
# PROBLEM: Distorted audio.
CAUSE and SOLUTION: Input sensitivity is not set properly, or amplifier or source unit is defective. Check INPUT LEVEL setting, or check speaker wires for shorts or grounds.
# PROBLEM: Distorted audio (PROTECT LED glows intermittently).
CAUSE and SOLUTION: Short circuit in speaker or wire. Remove speaker leads one at a time to locate shorted speaker or wire, then repair.
# PROBLEM: Music lacks “punch.”
CAUSE and SOLUTION: Speakers are not connected properly. Check speaker connections for proper polarity.
CIRCUIT DIAGRAM
INVERTER POWER SUPPLY
PRE AMPLIFIER CIRCUIT
POWER AMPLIFIER CIRCUIT
