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5
5. TROUBLESHOOTING TABLE
Are the power cord and harness in the unit properly connected?
LINE_FILTER_UNIT:
Is F7000 normal?
POWER_UNIT
YES
Is B_BUS (+320V) output? (Set the main power SW to OFF.)
* When power on/off switch is on • • • About +400V
Is a voltage of BU5V applied to pin (8) of connector (PD)?
(Set the main power SW to OFF.)
Are INV60V, UR15, and S15V output as for the power on/off
switch when it is on?
Similarly, is PNL12V output as for the power on/off switch when it
is on?
5
6
Power unit operation check.
YES
YES
YES
YES
6
7
NO
Connect the power cord and harness properly, and turn on the
power.
LINE_FILTER_UNIT:
Isn't FL7001, L7001, R7002, CX7000-1, Z7000, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
NO
is checked.
POWER_UNIT:
BD7000, TH7000-1, IC7801,Z7800, etc. out of order?
Moreover, whether the short-circuit with the circumference circuit
is checked.
NO
Does the PFC circuit operate normally?
(L7800, L7801, T7800, D7806, Q7804-5, IC7800-1 and etc. And,
the circuit around the protection circuit etc. is checked.)
NO
Does the switching circuit operate normally?
Check circuit around the primary side (T7901, IC7905, Q7902,
Q7912-3, D7908-9, D7904, D7910, etc.), the secondary side
(D7918, L7900, etc.), the AC_DET circuit (D7911-2, IC7909,
IC7902, Q7910, Q7901, etc.), and the protection circuit.
NO
Does the inverter circuit operate normally?
Check circuit around the primary side (T7001, T7601, IC7603,
IC7601, IC7600, Q7600-2, D7608, D7610, D7613, etc.), the sec-
ondary side (D7560-3, L7560, D7150-1, L7150, L7152, Q7911,
etc.), the PS_ON circuit (Q7300-1, etc.), and the protection cir-
cuit.
NO
Check PNL_POW circuit of Q7121-2, etc. and the circuit around
the regulator circuit etc. of IC7121, L7121, D7121, etc.
KRL-46V
7
8
A
B
C
D
E
F
35
8
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