KX-HDV20RU - Panasonic PBX Service Manual (repair manual). Page 13

13

Refer to waveform(1),(2),(3) in Waveform (P.22)

Yes

Yes

 

END

Measure the voltage at TP_1.2V.
Is it 1.2V?

Yes

Related parts: IC101,L105,C154,C103

No

Related parts: JK101, F101,L103,L104,

HDV20 cable

See 6.2. LCD Does Not Operate. 

Confirm the  LCD Display and Backlight.
Is it working?

Measure the voltage at Pin 1 of JK101.
Is it about 12V?

Related parts: C219,C220,R203,C203,C252,

C214,IC201,R202,C239,L203,
R210,R207,C212,C216,C214,
C218,R212,

Measure the voltage

at TP_5V.

Is it 5V?

Measure the voltage at TP_3.3V.
Is it 3.3V?

Related parts: C221,C222,R204,C202,C225,
                       R213,IC202,R201,L202,C232,
                       R208,R209,C213,C215,C217,
                       C240,R211

No

No

No

No

No

No

Measure the voltage at 1.8V.
Is it 1.8V?

Yes

Yes

Related parts: IC101,C116,C113

No

Confirm the waveform of reset signal at RSTN.
See the waveform(1)*.

Yes

Related parts: JK101,D106,C162,Q123,R206,

R205,C210,C129,IC104,C152,
R116,R110,C104,IC101

No

Confirm the frequency of clock signal at 
Pin 46 of IC101.Is it 13.824MHz?
See the waveform(2)*.

Yes

Related parts: IC101,C131,C132,X101,R104,

R111

No

Confirm the waveform of Flash data.
See the communication waveform(3)*.

Yes

Related parts: IC101,IC102,L113,C123,R115,

R113,R139,R140,R141,R142

No

Yes

No

  Check the soldering.
  Resolder or replace parts as needed.