Qtx QP475 User Manual - page 4
Check the USB input by gradually increasing the VOLUME control positioned next to the USB connector. Check the LCD display to see the
media type and player status. See below for the functions of the transport controls
…
For internal delay effect, turn up the LEVEL control in the delay section and dial in the DELAY control for each channel as required, adjusting
TIME and REPEAT controls to produce the desired type of echo or repeat effect.
Adjust overall volume via the MASTER control and the overall tone can be adjusted from the 5-band graphic EQ section. These sliders affect
(from left to right) low, low-mid, mid, mid-high and high frequencies to help balance the tone of the overall output.
Specifications
QP475
QP8200
Powser supply
115 / 230W, 50 / 60Hz (IEC)
Input Impedance
Mic - bal
2kΩ
Mic - unbal
1kΩ
Line
10kΩ
RCA inputs
47kΩ
Channel EQ
Treble
±12dB @ 10KHz
Bass
±12dB @ 100Hz
Master EQ
60Hz
±12dB
250Hz
600Hz
2kHz
8kHz
Frequency Response
20Hz-20KHz +1dB/-3dB @ 1W Output to 8 Ohm Speaker
THD
<1% fully driven into 4Ω load
Max Power Output
785W @ 4Ω
200W @ 4Ω
Power Consumption
120W
320W
Dimensions
319 x 247 x 198mm
463 x 247 x 198mm
Weight
6.8kg
9.7kg
Troubleshooting
“POWER” LED does not light on receiver
Ensure mains lead is connected to mains and voltage selector is same as mains supply
Ensure POWER is switched on
Check Plug-top fuse and mains fuse in IEC inlet are both OK
“POWER” LED is lit but no signal LEDs illuminating
Check input source and connection cable work (using a different mixer or amplifier)
Ensure MASTER and channel VOL levels are not turned fully down
For condenser microphones, check that +15V phantom power is switched on
Unplug MASTER INSERT and check if wired correctly and connected equipment is working.
LEDs are lit but no sound through speakers
Check speaker leads are OK and connected properly
Check speakers are working properly (using a different mixer/amplifier)
USB player will not play digital media files
Check file format is a standard compressed type
– certain formats may not be recognised
Check if USB pen drive is damaged or data is corrupted (try a different USB pen)
Check LCD display for status and use transport controls to navigate through files
Ensure that VOL control next to USB input is turned up
Output is distorted or very loud
Check that line level source is not connected to an XLR input
Reduce channel VOL, TREBLE and BASS controls if set too high
Feedback (loud squealing or howling) from speakers
Ensure microphones are not pointed towards the speakers
Reduce VOL, TREBLE or BASS for microphone input(s)
Reduce DELAY level on microphone inputs
Try to eliminate feedback by reducing particular sliders on the Graphic Equalizer
Output is very low
Turn up MASTER volume and/or channel VOL controls
Turn up AUX or USB VOL controls
Ensure Graphic Equalizer sliders are not set too low
Check level on any equipment connected to MASTER INSERT isn
’t set too low
Note: for further troubleshooting, refer equipment to qualified service personnel for testing
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