Thiele Streamfeeder Pro Series Manual page 77

Quick-Look Troubleshooting (continued)
Problem
Display does not
function properly
Even though the display may
not be working properly, it
may still be possible to operate
the feeder via the keypad. For
example, if you can cycle the
feeder by pressing the "cycle"
key, and vary the speed with
the up and down arrow keys,
the keypad decoder board is
most likely operational.
All user programmable
parameters that are held in
memory will be lost when the
RAM is cleared.
"FEEDER TIMED OUT"
message displayed
P S Si-1750 M
ro erieS anual
Solution
1. Check green "heartbeat" LED located on the top of the CPU board. It will blink at
regular intervals under normal operation when the feeder is in "Ready" or "Suspended"
mode. If the blinking green "heartbeat" LED is not present, refer to the section titled
"CPU board heartbeat pulse not present."
2. Check outputs of DC power supply and connections to the keypad board as well as
to the CPU board. The keypad decoder board is mounted "piggy back" to the display
board.
3. Check fuse on the keypad decoder board.
4. Make sure keypad decoder board is operational by referring to the section titled "Key-
pad does not respond."
5. Test vacuum fluorescent display (VFD) tube.
a. Remove keypad ribbon cable from the connector on the keypad decoder board.
b. Remove four screws holding keypad decoder/display board combination to its
mounting apparatus.
c. Locate connector CN2 on the face of the VFD circuit board, and jumper pins 2
and 3.
d. Apply 5VDC power to keypad decoder board DC input.
e. A checkerboard pattern should be seen alternating across the screen's pixels
where each character is normally displayed. If not, go to step 9.
6. Check 50-pin ribbon cable between keypad decoder board and the CPU board for
positive connection and integrity.
7. Check all CPU jumpers for correct positioning, but specifically check jumper JP8 for
correct positioning on pins 1 and 2.
8. Clear CPU board RAM by removing jumper J4 for 10 minutes. All user programmable
parameters that are held in memory will be lost when the RAM is cleared. (It is recom-
mended that the user programmable parameters should be noted in this manual prior
to trouble for reference as needed in the future). After waiting 10 minutes, replace
jumper J4 and reboot machine.
9. Replace display board.
10. If after determining the keypad decoder board, the ribbon cable, and the display board
are all good components and this still does not give positive results, the CPU board is
faulty and must be replaced.
1. Double check the mechanical setup of the gate cylinder, material hold down, and
wedge assembly is correct. Verify a gap is pulled between each piece of material as it
is fed through the discharge of the feeder. If the sensor does not sense a gap between
each piece of material, a feeder time out will occur.
2. Make sure the green LED on the body of the "sheet" sensor is illuminated when the
feeder power is on. If not go directly to step 3. Also check the amber LED on the body
of the same sensor is illuminated when a sheet of fed material is presented to the sen-
sor, and is NOT illuminated when a sheet is not present. Finally, make sure the "sheet"
sensor cannot sense anything in the background beyond the fed material. If the green
and amber LEDs operate as they should, go to step 3b.
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