Middleby Marshall PS770G GAS User Manual download pdf (Page 12)

ATTACHING THE POINT OF SALE CABLE

Remove the cable (P/N 59198) from the Kit. Attach the 90

degree plug to the rear of the touchscreen display and route

the serial connector out the grommetted bottom hole and

along the gas pipe. Connect the serial connector with the

cable supplied by the customer.

CONVEYOR BELT REVERSAL

Conveyor belt reversal consists of three steps:

1. Physically reversing the conveyor belt

2. Resetting direction jumper on the conveyor control board.

3. Switching the photo detector.

REVERSING THE CONVEYOR BELT

Remove the conveyor from the oven and find the master link

location. Remove master links and remove the belt from the

conveyor frame. Reassemble the belt back onto the frame (in

the reverse direction) and reinstall the master links. Replace

the conveyor assembly in the oven.

RESETTING DIRECTION JUMPER

Locate Jumper P1 on the conveyor control board. Move jumper

from terminals 1 and 2, and replace onto terminals 2 and 3.

SWITCHING PHOTO DETECTOR

Remove both rear fan belt covers, then remove the motor cover

assembly from both sides of the oven. The photo eye is located

on the front side of the left motor bracket. Disconnect the three

connecting wires, noting which color wires assemble to the

associated wires on the photo-detector. Remove the entire

photo detector bracket. Replace the assembly to the right-

hand side of the unit, mirroring the way it was assembled on

the left. Reconnect the detector wiring in the same order it was

on the left.

Incoming electrical power lines are fed through the strain-

relief fitting, shown in Figure 2-12. The electrical supply

connections are made inside the electrical junction box. The

power lines then connect to the oven circuits through safety

switches located inside the machinery compartment and

each blower motor compartment. These switches interrupt

electrical power to the oven when the Machinery Compart-

ment Access Panel is opened, OR when either of the blower

or rear shrouds is removed.

Mount the new reflector bracket to the provided holes on the

front right-hand side of the oven. The reflector should be

positioned just above the conveyor belt.

Using an assistant, hold both back cover switches in the

closed position. This will allow power to the photo-eye, and

it will provide a red beam for aiming. Loosen one of the screws

holding the photo detector gimbal tight, allowing it to be

reaimed at the reflector. The beam should hit exactly in the

center of the reflector, then tighten the screw back down.

Note: This is MUCH easier in reduced light.

Replace all covers.

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Middleby Marshall PS770G GAS User Manual Page 12

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