User Guide

18
DCD-510AE
TROUBLE SHOOTING
FLOW CHART NO.1
The power cannot be turned on.
㸣
Is the fuse normal? 㸢No See FLOW CHART No.2 <The fuse blows out.>
㸣Yes
Is normal state restored when once unplugged power cord
is plugged again after several seconds?
㸢No
㸣Yes
Is the +5VDD line voltage normal? 㸢No
㸣Yes
Check each rectifying circuit of the secondary circuit and
service it if defective.
FLOW CHART NO.2
The fuse blows out.
㸣㸣
Check the presence that the rectifying diode or
circuit is shorted in each rectifying circuit of
secondary side, and service it if defective.
㸣㸣
After servicing, replace the fuse.
FLOW CHART NO.3
+3.3V is not outputted.
㸣
Is VCC(5V) voltage supplied to Pin(3) of IC94? 㸢No Is M+8V voltag e supplied to Pin(2) of IC93?
㸣Yes 㸣Yes
Check IC34, L370, L371, C370, C371 and the periphery
circuit, and service it if defective.
Check IC93, IC94 and the periphery circuit, and service it
if defective.
FLOW CHART NO.4
The fluorescent display tube does not light up.
㸣
Is +3.3V voltage supplied to Pins(37) of FL41? 㸢No Check the +5VDD l ine and service it if defective.
㸣Yes
Is the voltage of approximately +41V supplied to Pin(38) of
FL41?
㸢No Check the VF line and service it if defective.
㸣
Yes
Is the voltage of approximately 3.3V supplied to Pin(1),
(43) of FL41?
㸢No Check the FIP1/FIP2 line and service it if defective.
㸣Yes
Check the fluorescent display tube control signal of a
microcomputer. (VFD-RST, VFD-CS, VFD-CLK, VFD-DATA
FLOW CHART NO.5
VF is not outputted.
㸣
Is approximately +42V voltage supplied to the kathode of
D914?
㸢No
Check D914, D915 and periphery circuit, and service it if
defective.
㸣Yes
Check if there is any leak or short-circuit on the loaded
circuit, and service it if defective.
FLOW CHART NO.6
The key operation is not functioning.
㸣
Are the contact point and the installation state of the key
switches (SW41-SW47) normal?
㸢No
Re-install the switches (SW41-SW47) correctly or replace
the poor switch.
㸣Yes
When pressing each switches (SW41-SW47), do the voltage
of pin(86) of IC21 increase?
㸢No
Check the switches (SW41-SW47) and their periphery, and
service it if detective.
㸣Yes
Replace IC21.
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(T901, D902, D903, IC93, IC94)
Check t he presence t hat t he primary co mponent㵘is
leaking or shorted and service it if defective.