Troubleshooting; Current Draw - Yamaha PA24 Owner's Manual

Troubleshooting

The following table lists the main causes of abnormal operation and the corrective measures required as well as the
protective circuit operation in each case.
Indicator
CLIP indicator lights up
PROTECTION indicator lights
up

Current Draw

PC9501N
standby
idle
8 Ω/ch
1/8 power
4 Ω/ch
8 Ω/ch
1/3 power
4 Ω/ch
PC6501N
standby
idle
8 Ω/ch
1/8 power
4 Ω/ch
8 Ω/ch
1/3 power
4 Ω/ch
PC4801N
standby
idle
8 Ω/ch
1/8 power
4 Ω/ch
8 Ω/ch
1/3 power
4 Ω/ch
14
Possible Cause
There is a short at the
amplifier's speaker outputs, the
speaker's inputs, or in the
wiring.
The impedance of the connected
speaker is too low.
The heat sink temperature has
exceeded 90°C.
A DC voltage of ±2 V or greater
was detected in the amplifier's
output circuit.
Line Current (A)
100/120V 230/240V
0.08 0.04
1.0 0.5
8.2 4.5
10.5 5.8
16.8 9.2
23.7 13.0
Line Current (A)
100/120V 230/240V
0.08 0.04
1.0 0.5
5.4 2.9
6.9 3.8
11.4 6.3
16.4 9.0
Line Current (A)
100/120V 230/240V
0.08 0.04
1.0 0.5
3.6 2.0
6.2 3.4
8.5 4.7
15.0 8.2
Remedy
Locate and remove the short.
Use a speaker with a minimum
impedance of 4Ω (8Ω in Bridge
mode).
Check the ventilation around the
amplifier and improve the
airflow if necessary.
Consult your dealer or a Yamaha
service center.
Power (W)
In Out Dissipated
5 0
55 0
500 250
682 375
1093 667
1613 1000
Power (W)
In Out Dissipated
5 0
40 0
375 188
500 275
820 500
1183 733
Power (W)
In Out Dissipated
5 0
40 0
253 125
444 200
612 333
1077 533
Protection Circuit
The PC limiter circuit activates
to protect the power transistors.
The thermal protection circuit
activates to protect the power
transistors.
The output relay activates to
protect the speaker system.
Thermal Dissipation
Btu/h kcal/h
5 17
55 188
250 853
307 1050
426 1450
613 2090
Thermal Dissipation
Btu/h kcal/h
5 17
40 137
188 640
225 768
320 1090
449 1530
Thermal Dissipation
Btu/h kcal/h
5 17
40 137
128 435
244 834
279 952
544 1860
4
47
215
264
367
527
4
34
161
194
275
387
4
34
110
210
240
468