41
LC-26GA5E
LC-32GA5E
LC-32GD8E/RU
LC-32BT8E/RU
LC-37GD8E/RU
LC-37BT8E/RU
LC-32/37GD8E/RU
LC-32/37BT8E/RU
26
LC-32/37GD8E/RU
LC-32/37BT8E/RU
TROUBLESHOOTING TABLE
NO
YES
NO
YES
YES
NO
YES
YES
Power unit operation check
Are the power cord and harness in the unit properly connected?
Are both ends of C704 and C705 (32"/37") short-circuited when
checking their resistance values?
Connect the power cord and harness properly, and turn on the
power.
Is a voltage of BU5V applied to pin (20) of P701? (Set the main
power SW to OFF.)
C704
•••
Check VA701, VA702 and D701.
C705(32
”
/37
”
)
•••
Check IC704 and 705.
Is F701 normal?
Does the same symptom appear even if R858 (2.7k) is removed
and the power is supplied again?
Is a voltage of approx. 8
–
15V to pin (4) of IC705?
NO
Replace F701.
YES
Check short circuit of 5V line (D737, C752, etc.).
NO
Check IC705, IC708, D725
and Q724.
NO
Check IC704, D728, D762 and D736. If there are no problems,
check the resistance value between pins (1) and (6) of P704.
When the value is low (several
Ω
- several hundred
Ω
),
disconnect P704. If the value is still low, the parts of 24V line are
defective. When the resistance value is several k
Ω
, check the
inverter unit.
YES
Check Q724, D731, D734, IC707, D751, D753, D754, D741,
D759 and D746.
Does a relay noise sound? (Once)
YES
NO
Check peripheral circuits of D738, R828 and D735.
NO
Are PCON1 and 2 [pins (1) and (2) of P702] at Hi (3V or more)?
NO
There is a possibility that control by P-CON is not performed
properly. Check whether the "PS-ON" and "PS-ON2" signals are
sent from pins (97) and (91) of IC1710 (FPGA) of MAIN-UNIT.
YES
Check peripheral circuits of Q712, Q713, Q721, Q723 and
RY701.
Is it a symptom that the relay clatters twice as soon as the main
power SW is set to ON and the power is not supplied?
TROUBLESHOOTING TABLE