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Operation
This section discusses how to operate the XPA U 4004 FX audio power amplifier. Topics covered include:
•
Front Panel Features and Operation
•
Rear Panel Features and Operation
•
Operation
•
Troubleshooting
Front Panel Features and Operation
A
B
Groove for inserting Grille removal tool
A
Removable Plastic Grilles
B
Channel Status LEDs
C
Figure 5.
Front Panel for XPA U 4004 FX
Grooves for inserting Grille removal tool (2) — Insert the included plastic pry tool, flathead screwdriver, or
A
other small flat object into this groove and pull forward to remove the plastic Grille.
Removable Plastic Grilles (2) — The removable plastic grille assembly is secured to the steel front chassis
B
by two tabs on the inner edge that hook under the center UI section and are held in place by a neodymium
magnet on the outside edge. The grilles are removable by inserting the included plastic removal tool into the
front panel groove and pulling forward.
Each plastic grille covers a foam air filter. The filters are held in place inside the grille by crush ribs along the
inside edges of the grille.
To replace the filters, remove the grille from the front panel by inserting the included plastic pry tool, flathead
screwdriver, or other small flat object into the groove along the outer edge of the grille and pulling forward.
Remove and wash or replace the filter.
Channel Status LEDs — Four pairs of LEDs provide feedback about the status of each channel. They have
C
the same function as the corresponding rear panel LEDs (see figure 6 on page 9).
The upper LIMITER/PROTECT LEDs light red when the channel is in protection mode, triggered by any of the
limiter protection circuits:
•
Excessive clipping (providing sufficient warning before the transformer cores in a high impedance speaker
system saturate).
•
Short circuit on output
The lower SIGNAL LEDs light green when the input signal crosses the signal detection threshold.
C D
E
POWER LED
D
OVER TEMP LED
E
QR Code
F
B
on page 9
on page 9
on page 9
XPA U 4004 FX • Operation
A
F
8
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