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KX-NS5170XSX, KX-NS5170X-SX - Panasonic PBX Service Manual (repair manual). Page 20

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20
KX-NS5170X/KX-NS5170SX
YES
YES
NO
YES
Is the dial tone 
heard?
Is the 
unit T76 series or 
DT series DPT?
NO
NO
Is the 
voltage between D1 
and D2:40V or 40V 
ON/OFF
DPT does not boot.
YES
NO
IIs the voltage 40V
YES
NO
Check the T100 
and U105.
YES
NO
Is VREF+ about 2V?
Is VREF- about 1.25V?
DPT is defective.
Replace IC401.
DPT is defective.
Replace the defective parts.
Replace Q400,IC401.
YES
NO
Does
PT_CUR switch 
ON/OFF?
YES
NO
Does PT_POW
switch ON/OFF?
Replace
IC401.
Check Q102,U102,U104,
U101,R112,R111,R116 
and the peripheral parts.
Then replace the 
defective parts.
YES
YES
Is the dial tone 
heard?
No
NO
Is the 
voltage between D1 
and D2:15V or 15V 
ON/OFF
YES
NO
Is the voltage 
15V
YES
NO
Check T100 
and U105.
YES
NO
Is VREF+ about 2V?
Is VREF- about 1.25V?
DPT is defective.
Replace IC401.
DPT is defective.
Replace the defective part.
Replace Q400,IC401.
YES
NO
Does PT_CUR
switch ON/OFF?
YES
NO
Does PT_POW
switch ON/OFF?
Check D100,Q100,Q101,
U103,U101,U100,R115 
and peripheral parts.
Then replace the 
defective parts.
Replace
IC401.
Replace
IC401.
Replace
IC401.
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