Read Panasonic KX-DT521RU Service Manual Supplement online
6
Changed from Original Service Manual as section 8.
2 Troubleshooting Guide
2.1.
No Operation
Check the soldering.
Resolder or replace parts as needed.
Resolder or replace parts as needed.
Related parts: JK300,L301,L302,T300,D300,
C550,C551
NO
YES
Confirm the voltage between Pin + and Pin - of
C550.
Does it switch into 15V or 40V periodically?
C550.
Does it switch into 15V or 40V periodically?
Related parts: IC510,L309,D315,C550,C557,
C558,R541,R547
Connect DPT to PBX.
Remove L221(VDD33), L220(VCCA33) and
L222(VCC33) from Main PCB.
Disconnect Operation PCB from Main PCB.
L222(VCC33) from Main PCB.
Disconnect Operation PCB from Main PCB.
Related parts: D301,C306,R306-310,Q301,
C310,C311,R342,R343,C330,
Q331,D532,R348,R349,C333,
Q332,D533,R351-355,C335,
C336,IC300
Q331,D532,R348,R349,C333,
Q332,D533,R351-355,C335,
C336,IC300
NO
NO
Confirm the voltage between TP:3.3V and
TP:DG_A.
Does it switch into 0V or around 3.3V periodically?
TP:DG_A.
Does it switch into 0V or around 3.3V periodically?
YES
Remove DPT from PBX.
YES
Confirm the resistance value between "VDD33" and
TP:DG_A.
Is it about 367Ω ?
TP:DG_A.
Is it about 367Ω ?
Related parts:IC410,C420,C453,R427,
C421,C418,C419,C455
all parts around "MICBIAS"
NO
YES
Confirm the resistance value between "VCCA33"
and TP:DG_A.
Is it higher than 1MΩ ?
and TP:DG_A.
Is it higher than 1MΩ ?
Related parts:IC410,IC401,IC300,
LCD module,
all capacitors connected VCC33
all capacitors connected VCC33
NO
YES
Confirm the resistance value between "VCC33" and
TP:DG_A.
Is it higher than 1MΩ ?
TP:DG_A.
Is it higher than 1MΩ ?
Put L221(VDD33), L220(VCCA33) and
L222(VCC33) back in place.
Connect Operation PCB.
Connect DPT to PBX.
L222(VCC33) back in place.
Connect Operation PCB.
Connect DPT to PBX.
Related parts: [Main CPB ] CN400
[Ope PCB] CN205
NO
Confirm the voltage between TP:3.3V and
TP:DG_A.
Is it about 3.3V?
TP:DG_A.
Is it about 3.3V?
[ Power supply circuit ]
Confirm the resistance value between Pin1 and
Pin10 of CN205.
Is it higher than 1MΩ ?
Pin10 of CN205.
Is it higher than 1MΩ ?
Related parts:[Ope PCB]
YES
NO
YES
GO TO
A
D201,C202,
C204,IC205,C203,C201,
C211,C243,C213,C241
C204,IC205,C203,C201,
C211,C243,C213,C241
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