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CHAPTER 4.
LC32X20E
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
Are the power cord and harness in the unit properly connected?
Is F7000 normal?
Is B_BUS (+280V) 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?
Power unit operation check.
YES
YES
YES
YES
YES
LC-32X20E/S/RU, LC-37X20E/S/RU
Service Manual
NO
Connect the power cord and harness properly, and turn on the
power.
Isn't FL7001, L7001, CX7000-1, Z7000, BD7000, TH7000,
NO
Z7001, IC7801, 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, IC7904, Q7902,
Q7912-4, D7905-6, D7904, D7910, etc.), the secondary side
(D7918, L7900, etc.), the AC_DET circuit (D7911-2, IC7909,
IC7902, Q7910, Q7915, etc.), and the protection circuit.
NO
Does the inverter circuit operate normally?
Check circuit around the primary side (T7001, T7600, IC7603,
IC7601, IC7600, Q7600-2, D7608, D7610, TH7600, etc.), the
secondary side (D7560, L7560, D7150, 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.
4 – 1
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Troubleshooting
