Troubleshooting, Block diagram – Roland STEREO KEYBOARD AMPLIFIER KC-110 User Manual
Page 12
10
Block Diagram
EQUALIZER
EFFECT
CH1
BALANCED
CH1
CH2
L/R
CH3
L/R
CH 1
CH 2
LOW
HIGH
VOLUME
CH 3
AUX
L/R
AUX IN
AUX
(STEREO)
LEVEL
FOOT SW
ON/OFF
LINE OUT
L/R
PHONES
(STEREO)
POWER AMP
TWEETER R
WOOFER R
HPF
MUTE
TWEETER L
WOOFER L
R
L
HPF
Symptom
Cause
Page
Power will not turn on
Are the AC adaptor and AC cord connected correctly?
p. 4
Is the AC cord correctly connected to an AC outlet?
p. 5
Are the batteries installed correctly?
Could the batteries have run low?
p. 4
No sound
Is the external equipment connected correctly?
If headphones are connected, no sound will be output from the speakers.
Are each channel’s level knob and the [VOLUME] knob adjusted correctly?
p. 5
Is the AUX IN [LEVEL] knob adjusted correctly?
p. 7
Could the batteries have run low?
The POWER indicator will dim when the batteries run low. If the batteries run even lower, the POWER indicator will blink.
Please install fresh batteries.
Sound is distorted
Noise is heard
Could each channel’s level knob or the [VOLUME] knob be raised excessively?
p. 5
Are the knobs of unused channels set to zero?
Is the input level from a device connected to an external mixer appropriate?
p. 5
Insufficient volume
Are each channel’s level knob and the [VOLUME] knob adjusted correctly?
p. 5
Is the input level from a device connected to an external mixer appropriate?
p. 5
Could multiple devices be connected to AUX IN jack?
p. 7
Could the batteries have run low?
The POWER indicator will dim when the batteries run low. If the batteries run even lower, the POWER indicator will blink.
Please install fresh batteries.
Effect not applied
Is the [EFFECT] knob adjusted correctly?
Could you have used a foot switch to turn off the effect?
p. 7
Effects cannot be applied to AUX IN.
Troubleshooting
If the system does not work as you expect, check the following points first.