HENNESSY INDUSTRIES Coats IBS 2000, Service Manual And Troubleshooting Manual

Service Manual — COATS Model IBS 2000 • 25

Parts Replacement Procedures for

Model IBS 2000 Balancer

The procedures in this section will aid in replacing

major subassemblies of the IBS 2000 balancer.

Do not disassemble, adjust or replace any part before

performing the PRELIMINARY INSPECTION and
FUNCTIONAL CHECK PROCEDURES. These proce-
dures, along with the troubleshooting flow charts, will
isolate the necessary adjustment or replacement.
Perform checks in the order listed and exactly as spec-
ified.

Refer to the exploded parts view, parts list and wiring

diagrams in this manual for parts identification.
Standard commercial fittings and fasteners are used
throughout and should be obtained locally.

Check all interconnecting wiring and connectors

when an electrical malfunction is indicated. Check all
fittings and fasteners when a mechanical malfunction is
indicated.

New Repair Procedure -

The model IBS 2000 is dif-

ferent from other Coats balancers in that it contains
five (5) separate boards which can be replaced individ-
ually. Always refer to the Trouble Shooting section for
diagnostic instructions to isolate the defective assem-
bly.

Note: ALWAYS  REFER TO THE WIRING  DIA-
GRAM (#112368) in the back of this book for
the following procedures.

Display Board Assembly Replacement

1.

Unplug the balancer.

2.

Remove the four (4) nuts on the back of the pod.

3.

Disconnect the power supply wire from P1.

4.

Disconnect the RS232 connector from P3.

5.

Disconnect the (red) start switch wire from P8.

6.

Disconnect the (grey) LCD backlight wire from P4.

7.

Disconnect LCD ribbon from P5.

8.

Remove the four (4) screws from the display board.

9.

Carefully raise the board, and disconnect the key-

pad ribbon.

Caution! DO NOT raise the board more than
4-5 inches or you will destroy the keypad rib-
bon.

10.

Replace the defective Display board and reinstall

in reverse order.

11.

Plug balancer in.

12.

Perform FUNCTION CHECKS.

Caution! If the (red) start switch wire P8 and
the (grey) LCD backlight wire P4 are not con-
nected in the correct location of the Display
Board; the LCD will work, and the LED's will
light momentarily. The start switch will not
work, then the LED's will blank.

Caution! If the RS232 Cable is in the wrong
port the communication is disrupted and
you will get a WARNING! COMMUNICATION
HAS BEEN Disrupted. Check Serial Cable.

Note: The display board contains a replace-
able E-prom chip for software revision. The
above procedures should be followed in
order to access this chip. Actual chip
replacement procedures are detailed next.

E-Prom Replacement

Caution! Touch the balancer to discharge
any static electricity in your body before
servicing an E-Prom. A static strap should be
worn. Static electricity can damage the chip.

1.

Unplug the balancer.

2.

Follow the DISPLAY BOARD REPLACEMENT pro-

cedures. Once you disconnect the keypad ribbon, you
can turn the board over and access the E-prom chip.

3.

Note the orientation of the chip before removing.

The top right corner is not square but cut diagonally,
and there are two locator dots (top left and bottom
right) on the chip.

4.

Insert the jaws of the chip extractor (Ammco #

29977) into the slots of the E-Prom chip. Remove the
chip.

5.

Install new chip the same way, note the orienta-

tion.

Caution! Be careful not to damage the con-
nector pins.

Note: The CPU Board also has an E-Prom
chip which should be replaced at the same
time, unless specified by the manufacturer.

6.

Reinstall display board.

7.

Plug balancer in.

8.

Perform FUNCTION CHECKS.

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