Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 56)

HI 2151/30WC MANUAL
4-2
Setting the Jumpers
WARNING
DANGEROUS VOLTAGE IS PRESENT WITHIN THE ENCLOSURE OF
THE INSTRUMENT AND PRESENTS A RISK OF ELECTRICAL SHOCK.
ALWAYS UNPLUG THE POWER CORD BEFORE OPENING AND SERVIC-
ING THE INSTRUMENT.
CAUTION SERVICING OF THIS UNIT SHOULD BE PERFORMED BY AUTHORIZED
AND QUALIFIED SERVICE PERSONNEL ONLY. FOLLOW ALL ELECTRO-
STATIC DISCHARGE (ESD) PROCEDURES WHEN OPENING THE
INSTRUMENT.
NOTE: Remove jumpers with all barriers.
Step 1. Disconnect the power cord.
Step 2. Use a phillips screw driver and remove the four (4) pan-head
machine screws that fasten the rear panel to the extrusion.
(See Fig. 4-2)
Step 3. Gently pull out the rear panel with the printed circuit boards
attached. The main board is in clear view.
FIG. 4-2 REMOVING THE REAR PANEL
CAUTION WHEN OPENING THE BACK OF THE HI 2151\30 WC, MAKE SURE THAT
YOU USE PROPER ELECTROSTATIC DISCHARGE PROCEDURES TO
PREVENT DAMAGE TO THE INSTRUMENT.
Step 4. If an option board is installed above jumpers, remove the
option board.
Step 5. The factory default position is for the RS-232 setting. (See
Fig. 4-3) The dip switches do not function when in the RS-
232 configuration.
Phillips pan
head machine
screws