Pioneer CDJ-500 error code E-91

[jango2]

Got this CDJ-500 displaying an E-91 every time you hit eject. All three
mechanism mode switches check out okay. The rest of the functions are
fine, i can even load a cd in eject mode (when the display says E-91) ,
shut door and then reset power.
If however i hit eject , the door opens , but the mechanism loading
motor continues to rotate towards the eject direction despite having
reached its limit point. The motors attempts to turn , thereby roughing
the belt up, for 5 seconds before E-91 appears on the display, after
which no functions are possible until power is reset.
The operating manual lists error 91 as "MECHANICAL TIME OUT Mechanical
operation did not end in allotted time (INSIDE: 5s)"
I don't have a service manual and am not about to spend 15 $ on such an
old model, particularly because the unit works fine otherwise and the
client might not want to spend too much on repair since the unit is
usable.
I suspect a blown port in the syscon PD4543A. Has anyone come accross
any other reason (such as a missing negative voltage)that could lead to
the same symptom being portrayed ?.

 

[jango2]

I did a cold check dc resistance ( forward and reverse ) of the 3 pins
of pd4543a which are mecha mode switch inputs , and all measure 28k
ohms both ways...if 1 was open or blown wouldn't it measure different.?
One end of each switch is gnd while the other (IC input end) is tied to
+5V through a pull up 22k resistor.
Cant seem to locate a datasheet for the ic, it has a pioneer symbol on
it.
Help pullllleeeeeaase !!!!!

 

[Mark D. Zacharias]

I did a cold check dc resistance ( forward and reverse ) of the 3 pins
of pd4543a which are mecha mode switch inputs , and all measure 28k
ohms both ways...if 1 was open or blown wouldn't it measure
different.? One end of each switch is gnd while the other (IC input
end) is tied to +5V through a pull up 22k resistor.
Cant seem to locate a datasheet for the ic, it has a pioneer symbol on
it.
Help pullllleeeeeaase !!!!!

It's been a while, but it seems to me I've seen bad solder connections at
switches or connectors on these.....

Mark Z,

 

[jango2]

Wooopsie !!!
This unit has 4 mecha state switches not 3 as i'd mentioned....Open
circuit to 4th ....tiny li'l bugger under the mechanism....problem
solved ...Thanks Mark all the same .

 

[Mark D. Zacharias]

Wooopsie !!!
This unit has 4 mecha state switches not 3 as i'd mentioned....Open
circuit to 4th ....tiny li'l bugger under the mechanism....problem
solved ...Thanks Mark all the same .

Cool!

mz