VSX-516-K
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7.3.3 AMPLIFIER FAILURE DIAGNOSIS FLOW CHART
Amplifier failure diagnosis flow chart
When DC detection is activated ("AMP_ERR" flashes on the display), failure (damage) of the power amplifier
section is considered.
As DC detection and fan stop protection circuits commonly use same abnormality detection port in
microprocessor, please make sure that the operation of fan motor is in normal condition before proceeding to
the troubleshooting of amplifier.
Caution:
When releasing the lock state of power key before repair, please be careful because there is the
possibility that more damages will occur when turning on the power once again!
• According to a symptom, perform the following confirmation beforehand.
1) Is the operation of fan motor in normal condition?
↓
2) Are there any Fuses and IC protectors open?
↓
3) After turn on the power, confirm that the supply voltage of the point that can be measured is appropriate.
(Particularly the supply voltage of the power Tr and drive step)
↓
4) Whether the voltage of pin3 of IC600, IC601, IC602 or IC603 is equal to (VL-0.7V). If not (eg, equal to VH),
then change the corresponding power pack IC600, IC601, IC602 or IC603.
↓
5) Furthermore, check the output DC voltage of each channel of power pack IC600, IC601, IC602 and IC603
to limit the failure channel and identify the defect power pack.
↓
• After identify the failure channel, check that each part is not damaged (resistor, diode... etc. value / open /
short)
