Bennett 621 Interconnection Box Instruction & Service Manual
Service Instructions
13
SECTION 4: SERVICE INSTRUCTIONS
This section describes the information provided on each diagnostic display message.
Note:
Displays shown throughout the
manual are examples only. Information may vary based on dispenser options.
LED DIAGNOSTICS
The 621 Circuit Board has surface mount LEDs that are used for troubleshooting. If the console and dispensers are
communicating, all LED’s will be flashing. If not communicating with the POS or Dispenser then the “Transmit” LED for that side
will be on constantly and the “Receive” LED will be off. Refer to the troubleshooting section for more information. Refer to the
figure below for LED locations. Refer to the figure below for LED locations.
LED
COLOR
DESCRIPTION
COMMUNICATION TYPE
IMAGE
D1 (WT)
Red
Generic Current Loop Transmit
Fuel Controller
D2 (WR)
Red
Generic Current Loop Receive
Fuel Controller
D3 (BT)
Red
Bennett Transmit
Dispenser Communication
D4 (BR)
Red
Bennett Receive
Dispenser Communication
LED TROUBLESHOOTING
Remember to use the LED lights as diagnostic tools. Verify that the console is programmed correctly for operation with Bennett
dispensers.
PROBLEM
CAUSES
SOLUTIONS
No LEDs are flashing
1.
The 621 Board is not receiving power.
2.
The console is not transmitting commands to
dispensers.
1.
Ensure AC/DC power supply is
plugged in.
2.
Ensure console is on and
programmed correctly.
Only D1 (WT) LED is flashing
1.
Jumper JP2 is not in the RUN position.
2.
The 621 Board is damaged.
1.
Ensure JP2 is on the top two pins.
2.
Replace the 621 Board.
D3 (BT) LED is momentarily
solid and D1 (WT) and D4
(BR) LEDs are flashing
1.
Console is attempting to communicate with a
disconnected fueling position or dispenser
that is powered off.
1.
Reconnect data wires or restore
power to the dispenser.
D1 (WT)
D2 (WR)
D3 (BT)
D4 (BR)
