Welch Allyn Micro Tymp 1, Service Manual

Page: 58 / 82

Section 4.2 Disassembly & Reassembly
Re-assembly and Repair of the Handle
L 1. REPLACE DIAPHRAGM CONTINUED.....
PROBLEM DETECTION:
THE PUMP PISTON CAN BE POSITIONED AT THE TOP OF
ITS STROKE BY PUSHING THE “UP” BUTTON ON THE MICROTYMP CALIBRATOR
WHEN IT IS SET ON THE ‘CALIBRATE’ MODE. HOLD THE “UP” BUTTON UNTIL
THE PISTON STARTS RATCHETING, CLICKING (SLIPPING) ON THE TOP OF THE
PULLEY THREADS. THIS IS ACCEPTABLE. AFTER YOU ARE SURE THE PISTON HAS
REACHED THE TOP, RELEASE THE “UP” BUTTON, AND PUSH THE “DOWN” BUT-
TON. THE PISTON SHOULD TRAVEL DOWN WITHOUT DELAY. HOWEVER, IF IT
DOES NOT RESPOND THIS WAY, IT IS AN INDICATION THAT THE PUMP DIA-
PHRAGM/PISTON HAS BECOME DISENGAGED FROM THE TOP OF THE PULLEY
THREADS. THEREFORE A SIMPLE FIX, DESCRIBED BELOW, IS RECOMMENDED.
TO OBTAIN A FOAM PAD, CONTACT THE TECHNICAL SERVICE DEPARTMENT
AT WELCH ALLYN. PHONE NUMBERS ARE LISTED ON PAGES 1.1 AND 1.2.
L 2. INSTALL FOAM PAD. REFER TO FIGURE 4.9 BELOW.
DISASSEMBLE THE PUMP AS DESCRIBED ABOVE. INSPECT THE FOAM PAD
AND THE HOUSINGS FOR ANY PARTICLES OR DEBRIS. THIS COULD CAUSE
CLOGGING OF THE TUBING. POSITION THE SELF-STICK FOAM PAD IN THE
CENTER OF THE UNDERSIDE OF THE TOP CAP ASSEMBLY.
FIGURE 4.9 - POSITION OF FOAM PAD IN TOP CAP OF PUMP
L 3. REASSEMBLE THE PUMP.
REPOSITION THE DIAPHRAGM BY TURNING THE PULLEY CLOCKWISE
UNTIL THE FLAG IS AT THE TOP OF THE PUMP HOUSING. THIS CAN BE
DONE BY USING A STRAIGHT SCREWDRIVER. GENTLY INSERT THE DIA-
PHRAGM PLACEMENT TOOL T-5734 INSIDE THE DIAPHRAGM AND PUSH
STRAIGHT DOWN UNTIL THE LIP OF THE DIAPHRAGM LIES FLAT IN THE
GROOVE OF THE HOUSING. HOLD DOWN THE DIAPHRAGM SO IT DOESN’T
POP OUT. REMOVE THE T-5734 DIAPHRAGM TOOL. POSITION THE FLAG IN
THE MIDDLE OF THE SLOT AND PUT THE TOP CAP ON. MAKE SURE THE
FLAG REMAINS CENTERED. TIGHTEN THE FOUR SCREWS AND THEN
CHECK OPERATION OF PUMP.
pg 49