PDP-507CMX
93
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Yes
Yes
Yes
Yes
Yes
Troubleshooting of the D+3.3V output abnormal operation.
Check of D+3.3 power supply line
Is the D+3.3V output of CN307
(pins1-3) normally 3.3V?
Please check the voltage.
Please check the loose contact
about CN307, connector wire.
Is this contact OK?
Please check the loose contact
about CN302 connector wire.
Is this contact OK?
Yes
In this case, the MAIN Assy side
is abnormal.
See the LED indicators about
trouble shooting chart or trouble
shooting chart of “Abnormally in
image”.
Yes
Please replace C320.
In this case, C320 electrolytic
capacitor is shorten.
Is the VCC5.1V input of CN302
(pis7-10) normally between 4.85V
and 5.36V?
Please check this voltage.
Check the Q302 FET gate terminal
(pin4) waveform.
(About 8-10Vp-p rectangular pulse)
Can you see the same waveform?
Please replace IC303 or FET
Q302 or D304.
In this case, any of the IC303 or
FET Q302 or D304 (bootstrap
diode) is broken.
In this case, the D+3.3V output is
fallen down. The low voltage
alarm on the MAIN Assy is
functioned.
Check the waveform of Q303 FET
drain terminal (pins5-8).
Can you see the same waveform?
Waveform 54
No
After remove the CN307
connector wire, please check the
D+3.3V output line is shorten or
not by using the D.M.M.
Is this line shorten?
Please replace the connector wire.
No
No
Please replace the connector wire.
No
No
No
No
In this case, the POWER
SUPPLY Unit is abnormal.
Please replace the unit.
In this case, any of IC303
(D+3.3V control IC) or FET Q302
or FET Q303 is broken.
Summary of Contents for PDP 507CMX
Page 44: ...PDP 507CMX 44 1 2 3 4 1 2 3 4 C D F A B E 4 2 OVERALL CONNECTION DIAGRAM 2 2 ...
Page 45: ...PDP 507CMX 45 5 6 7 8 5 6 7 8 C D F A B E ...
Page 84: ...PDP 507CMX 84 1 2 3 4 1 2 3 4 C D F A B E 500ns div 500ns div 200ns div ...
Page 104: ...PDP 507CMX 104 1 2 3 4 1 2 3 4 C D F A B E ...