Valco Cincinnati VC350A, Manual

Page: 86 / 327

Section 10 — Troubleshooting VC350A Flexoseal
®
System
Valco Cincinnati 10-16
2. If the “ENC” LEDS (D4 and D11) do not illuminate and the “SCAN” LED does not blink, replace the main
board.
3. If the “RATIO” LED (D10) does not illuminate, do the following:
3a. Ensure that the U9 chip is firmly seated in the socket.
3b. Ensure that there is a “Ratio Comp” setting on switches SW3-SW7 (e.g., 1.0000).
3c. Ensure that JP2 is selected either for “STD” mode or for “ENB-500”.
3d. Check for ON/OFF comp setting at DS1 and DS2 (or P1, P2). (A minimum of .5 ms should be
selected.)
3e. If the “RATIO” LED (D10) still does not illuminate, replace the main board.
4. Return the “ENC” and “SCAN” switches to the down (external mode) position, and reconnect the valve
connectors at the valve driver board.
5. Run the parent machine above minimum speed. Again, the “ENC” LEDs (D4 and D11) should illuminate,
the “SCAN” LED should blink, and the “RATIO” LED (D10) should illuminate.
6. If the LEDs operated properly in the test (“TST”) mode, but not in the external mode, do the following:
6a. Check the interface ribbon cable at J1 on the interface board and J2 on the main board.
6b. Ensure that the encoder and scanner cable connectors on the interface board are properly seated.
6c. Check the external encoder and scanner cables.
6d. Check the encoder (see Encoder Diagnostics in this section).
6e. Check the scanner and mounting (see Scanner Diagnostics in this section).
Note! Scanner and encoder problems can be isolated by selecting either SW12-1 or SW12-2.
7. If all of the components in step 6 are working, ensure that the “FLAP” LED (D6) and the “GLUE” LED
(D8) are flashing.
8. Turn on the “GUN1” selector switch (it should illuminate), and check to see if the “GUN1” LED (D14)
and the “GLUE” LED (D8) flash. If they do not flash, check the “GUN1” selector switch connector at J5
on the main board.
9. Ensure that the “PEAK” and the “HOLD” LEDs on the valve driver board are flashing.
9a. If they are not flashing, check the ribbon cable to the valve driver.
9b. If they still are not flashing, replace the valve driver board.
10. If any of steps 7, 8, or 9 fail, disconnect the valve connectors at the valve driver board, set the ‘ENC” and
the “SCAN” switches back to the up (“TST”) position, and see if LEDs are operating properly in the test
mode.
11. If the LEDs do not operate properly in either the test or the external-mode positions, recheck the settings on
DS1 and DS2 to ensure that ON/OFF comp is at the minimum setting:
11a. Using a DVM, measure between TP5 (Reset) and TP5 (gnd). This measurement should be +5V. If
measurement is not +5V, replace the main board.
12. If the LEDs operate properly in the test mode but not in the external mode, ensure that the minimum speed
is set properly. Also verify that all internal cables are properly seated in the connectors, and not kinked or
pinched between components.