VC3500/VC3700 Troubleshooting Manual
Valco Cincinnati Page 6
Power Supply board
The Power Supply board's input connector J1 receives 24vac from the secondary winding of
Transformer 3 (two 12vac windings in series). J2 provides access for a regulated 12 vdc, 1A,
current protected, source for the backlight of the LCD/Touchscreen module. J3 provides
access for an unregulated 17 vdc source for illumination of LED light bars on the LED
board. J4 provides access for an unregulated 17 vdc source for the CPU board. J5 provides
access for an unregulated 17 vdc source for the Interface board. J7 provides access for an
unregulated 32 vdc source for a DD-1 pump.
Main Control
CPU (Central Processor Unit) board
The CPU board provides all logic control functions of the VC3500 including the following:
¨ A main processor oversees communications with the LCD/Touchscreen Module,
Channel Logic processors, Scanner Lockout Processors, and RS232 communications
board.
¨ Battery backed memory is available to hold parameters for 99 glue programs.
¨ Reset/Watchdog circuitry ensures the main processor does not get caught in a non-
recoverable program loop.
¨ Channel Logic processors for channels 1 & 2.
¨ Scanner Lockout processor for channels 1 & 2.
Channel Logic 3 & 4 board
The Channel Logic board for channels 3 & 4 is an optional daughter board that attaches
directly to the CPU board using connectors J5 and J6. It includes the following:
¨ Channel Logic processors for channels 3 & 4.
¨ Scanner Lockout processor for channels 3 & 4.
RS232 communications board
The RS232 communications board is an optional daughter board that attaches directly to the
CPU board using connectors J1 and J2. It provides capability of interfacing the VC3500 to
another RS232 compatible device for program download and storage. A flat ribbon cable
connects the internal RS232 port to a DB-9 male connector on the bottom surface of the
VC3500 for easy access.
Glue Inspection Logic board (VC3700 only)
The Glue Inspection Logic board gets pattern information from the CPU board and sensor
information directly at its terminals. It then controls pass/fail indicator lights on the front
panel, Machine Interface Relay, spray marker/kicker/diverter, and lights and horn on beacon
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