Welch Allyn Wall Transformer 76722

Refer to clock instructions in manual PN767036, pg. 5 & 6 for replacing clock battery and changing time.

Remove clock assembly from 767 and turn it over.

Remove three Phillips head screws using a #1 Phillips screwdriver.

Remove clock module from face-plate.

Did the set buttons come off during disassembly?

Replace the battery located on the underside of the clock module.

Disconnect wall transformer from mains before servicing.

Unplug power cord from bottom of wall transformer unit.

Ensure IEC connector accepts new plug; no disassembly required.

Refer to 767 Wall Transformer Instructions PN767036.

Remove four screws from the back of the unit using a Phillips #2 screwdriver

Position the 767 third handle assembly on its back and separate the MH-Front from the MH-Back

Disconnect the handle assembly Molex connector (brown 4-pin female) from the pins on the circuit board

Note colors of wires on plug of new handle assembly

Match wire colors with color coding printed on circuit board at the pins

Follow instructions in Section E, pg. 6 & 7 to remove and replace cradle

Use main unit as a power supply

Provide nominal voltage (7.0 V RMS) to third handle assembly

Check handle output consistency

Perform functional check of handle rheostat for smooth typical operation

Articulate coil cord and check for intermittent connections

Disconnect wall transformer from mains before servicing

Follow instructions in Section B-1 to remove MH-Front

Squeeze the plastic spring clips on the sides of the switch to force it out of the MH-Front

Align the lighted half of the switch rocker toward the cradles

Disconnect each wire from the old switch one by one and connect to the same terminal on the replacement switch

Press the switch into the MH-Front

Verify wiring conforms to Fig. 1.