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KX-B620 Series
KX-B520 Series
10-3. TROUBLESHOOTING
FOR MAIN UNIT
Is Fuse F1
Open?
Is Fuse F2
Open?
NO
NO
YES
Is Q1 or Q2
(E)-(C) Shorted?
NO
Is ZD3 Damaged?
NO
YES
Is R8 Open?
ts O3(E)-(C) Shorted?
NO
is C11, C12 or Ci0 Damaged?
< m1
wn
Is ZNR1
Damaged?
NO
Is C1, €2, C3 or
YES
C24 Damaged?
NO
ls PT Damaged?
<
m no
NO
Is Lt Open?
NO
Is 1C1_(1)-(3) or 1C4
YES
~
eo
is D1, D2 or ZD2 Damaged?
NO
Is C4, C5, C6, C7, C8
YES
or C9 Damaged?
Is D3 Damaged?
So
Is C13 Damaged?
:
NO
Replace each part
and fuse F1.
Is C17, C18 or ZD1
YES
Damaged?
Is 1C3 (10)-(8) Open?
Is R3, R2, 12
or L3 Open?
Is C14, C15 or C16
Damaged?
NO
Replace each part
and fuse F2.
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