Welch Allyn Micro Tymp 1, Service Manual

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Section 4.2 Disassembly & Reassembly
Reassembly and Repair of the Handle
F 1. REMOVE LCD ASSEMBLY.
REMOVE THE 2 SCREWS HOLDING DOWN THE HOUSING SUPPORTS. PULL
THE LCD ASSEMBLY OUT OF THE BACK HOUSING. DISASSEMBLE THE LCD
ASSEMBLY BY PUSHING IN ON THE TABS OF THE LCD FRAME AND PULLING
OFF THE GRAY RETAINER.
REASSEMBLY OF THE HANDLE
G 1. RE-ASSEMBLE LCD.
USE A SWAB DAMPENED WITH ISOPROPYL ALCOHOL TO CLEAN ZEBRA
STRIPS, CIRCUIT BOARD PADS, AND THE LCD. ALLOW ALCOHOL TO EVAPO-
RATE FOR ONE MINUTE. PLACE THE LCD INTO THE CLEAR LCD FRAME
WITH PRINTING RIGHT-SIDE-UP ON BOTH PARTS. PUT 2 ZEBRA STRIPS IN
THE GROOVES OF THE LCD. PLACE ZEBRA STRIP RETAINER BETWEEN THE
TWO ZEBRA STRIPS. PLACE THE SIDE WITH THE EXTENDED LEGS AS SHOWN
IN FIGURE 4.6. PLACE THE DRIVER BOARD ON TOP OF THE ZEBRA STRIPS AS
SHOWN. PLACE THE LCD RETAINER ON BY INSERTING THE TWO PLASTIC
ARMS OF THE LCD FRAME INTO THE SLOTS OF LCD RETAINER FLEX SIDE
FIRST. NEXT, PUT THE OTHER TWO PLASTIC ARMS IN THE SLOTS ONE AT A
TIME TO PREVENT BREAKAGE. PLACE THE LCD ASSEMBLY AND THE RUB-
BER SWITCH ARRAY INTO THE FRONT HOUSING. HOLD THEM IN PLACE
LONG ENOUGH TO SCREW DOWN THE TWO HOUSING SUPPORTS. DO NOT
FULLY TIGHTEN THE SCREWS UNTIL YOU HAVE PLACED THE SPRINGS
BETWEEN THE POSTS ON THE HOUSING SUPPORTS AND THE LCD RETAINER.
H 1. INSTALL KEYPAD ASSEMBLY.
INSERT KEYPAD ASSEMBLY INTO HOLES IN BACK HOUSING WITH SYMBOLS
RIGHT SIDE ‘UP’. ALIGN THE FLEX SIDE RETAINER (STRAIGHT ARM) OVER
THE LCD AND KEYPAD. INSERT SCREW AND START THE THREADS. WHILE
IT IS STILL LOOSE, INSERT THE SPRING BETWEEN THE SMALL PIN POSTS.
TIGHTEN SCREW AND DO THE SAME WITH THE OTHER RETAINER.
I 1. INSTALL REPLACEMENT VALVE.
ATTACH TUBING TO REPLACEMENT VALVE. PREPARE BOARD FOR RE-
SOLDERING BY REMOVING EXCESS SOLDER AND CLEARING BOARD HOLES
TO ACCEPT PINS OF REPLACEMENT VALVE. INSERT REPLACEMENT VALVE
IN PLACE WITH THE TUBE-END TOWARDS THE ‘TEE’. SOLDER VALVE IN
PLACE. CLIP OFF VALVE LEADS ABOVE SOLDER JOINTS.
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