KX-NSX1000, KX-NSX2000 (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 20

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20
KX-NSX1000/KX-NSX2000
9.3.
DC Power Circuit
Start
Preparation
Open the top cover
Power on
Use a digital oscilloscope
DC/DC IC21
+12V OK?
DC/DC IC22
+3.3V OK?
DC/DC IC33
+5.0V OK?
DC/DC IC38
+3.3V OK?
DC/DC IC23
+2.5V OK?
DC/DC IC26
+1.2V OK?
Repair IC22 
related circuit 
Yes 
No
Repair IC33
related circuit 
No
Repair IC38
related circuit 
No
Repair IC21
related circuit 
Yes 
No
Yes 
Repair IC23
related circuit 
No
Yes 
Repair IC26
related circuit 
No
Yes 
Check each voltage accuracy and ripple noise
(See waveform No.011 ~ No.019)
DC/DC IC25
+5.0V OK?
DC/DC IC30
+1.8V OK?
DC/DC IC31
+1.0V OK?
End
Repair IC25
related circuit 
No
Yes 
Repair IC30
related circuit 
No
Yes 
Repair IC31
related circuit 
No
Yes 

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