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KX-NS5170XSX, KX-NS5170X-SX - Panasonic PBX Service Manual (repair manual). Page 21

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21
KX-NS5170X/KX-NS5170SX
YES
Is the dial tone 
heard?
APT does not work properly.
Confirm the APT
NO
YES
Are
the LED and LCD 
normal?
Go to the flowchart of 
"SLT can not make a call."
NO
YES
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?
Replace IC401.
APT 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.
Replace IC401.
Check D100,Q100,Q101,U103,
U101,U100,R115 
and peripheral 
parts.
Then replace the defective parts.
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