Page 38 13900-103 Rev. A
Repair 6
LCD Screen Replacement
Introduction
This instruction sheet provides instructions regarding
installation of a replacement LCD screen (P/Ns 13920-947,
13960-945, or 13960-966).
Special Tools & Equipment
Digital Voltmeter (-50 to +50 VDC)
Procedures
Disconnect all input power from the unit. Remove the top
and side covers of the unit as indicated in the Service
Manual.
CAUTION: ANY REPAIR OR SERVICE TO THE THIS UNIT
MUST BE PERFORMED BY DEALERS WHICH ARE
TRAINED BY REICHERT OPHTHALMIC INSTRU-
MENTS SO THAT CORRECT MEASUREMENT OF
THIS UNIT IS MAINTAINED.
CAUTION: THE INTERNAL CIRCUITS OF THIS INSTRUMENT
HAVE ELECTROSTATIC DISCHARGE SENSITIVE
DEVICES (ESDS) AND ARE SENSITIVE TO STATIC
HIGH VOLTAGES STORED IN AND TRANSFERRED
BY THE HUMAN BODY. OBSERVE CORRECT ESDS
PRECAUTIONS OR PREMATURE MALFUNCTION
OF THIS INSTRUMENT WILL OCCUR.
CAUTION: THE POWER CABLE TO THE LCD DISPLAY
CONTAINS VERY HIGH VOLTAGE. DISCONNECT
THE INPUT POWER TO THE INSTRUMENT BEFORE
DISASSEMBLY OF THE UNIT OR SERIOUS
PHYSICAL INJURY MAY OCCUR IF THE HIGH
VOLTAGE CONNECTIONS ARE TOUCHED WHILE
THE UNIT IS OPERATING.
Removal of the damaged LCD
Note: Ensure all input power to the unit is disconnected
before removal of the LCD.
1. Remove the four screws which attach the front bezel
with the Reichert logo. Remove the bezel.
2. Remove the four screws which secure the LCD to its
mounting bracket.
3. Disconnect the LCD data connector which attaches
onto the back side of the LCD at connector CN1.
4. Disconnect the high voltage LCD backlight connector
which attaches to the bottom circuit board at J3.
Installation of the New LCD
1. Attach the data cable to the back of the LCD at CN1.
Ensure that the cable is secure and oriented straight
into CN1.
2. Install the new LCD screen using the four screws
which were removed. Use one drop of threadlocker
(e.g. Loctite 222**) on the threads to secure the
screws.
3. Attach the High Voltage LCD backlight connector to
the J3 connector on the bottom circuit board. Ensure
that the cable is routed through the tie wrap located
around the front support and that the connector is
locked into position.
4. Install the front bezel using the four screws which
were removed. Use one drop of threadlocker (e.g.
Loctite 222) on the threads to secure the screws.
Note: Do not install the outside covers at this time.
5. Refer to the Testing section of this manual and
perform the steps in the LCD Brightness Adjustment
paragraph.
6. Refer to the Testing section of this manual and
perform the steps in the LCD Contrast Adjustment
paragraph.
7. Perform the Steps in the Assembly section of this
manual for final assembly.
** Loctite is a Trade Name of Loctite CORP., U.S.A.
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