Dvr-S150 D-Amp Module Troubleshooting; Dvr-S150 Amp Adjustment; Dc Offset Adjustment - Yamaha DVR-S150 Service Manual

DVR-S150/NX-P150

DVR-S150 D-AMP MODULE TROUBLESHOOTING

When there is a possibility of the D-Amp Module being de-
fective, use the following procedure to determine whether or
not it is defective.
Step 1
With the power turned off, remove one D-Amp Module and
then turn on the power to the main unit.
If the protection function still works, turn off the power, re-
move another D-Amp Module and then turn on the power to
the main unit. Repeat this procedure until the protection func-
tion stops working.
Step 2
When the protection function has stopped working, install
the removed D-Amp Modules one by one to the main unit
and then turn on the power.
If the protection function does not work, the D-Amp Module
installed then can be judged as normal.
If the protection function works, on the other hand, the D-
Amp Module installed then can be judged as defective.
Repeat this procedure to check all the removed D-Amp Mod-
ules.
Caution
Note that there is a rare case where two or more D-Amp Mod-
ules are defective.

DVR-S150 AMP ADJUSTMENT

Condition
• Start adjustment 5 sec or more after the power is turned
on.
• Headphones are not plugged in.
• No input signal.

DC Offset Adjustment

Adjust the potentiometer on each D-Amp Module so that the
DC voltage becomes 0 ± 10 mV at each speaker output.
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