Welch Allyn Micro Tymp 1, Руководство по обслуживанию

Страница: 50 / 82

Section 4.1 Disassembly & Reassembly
Disassembly and Repair of the Handle
CONTINUED.....
BE VERY CAREFUL WHEN PULLING THE HOUSINGS APART SINCE THEY ARE
JOINED TOGETHER BY BOTH THE HOSES AND THE FLEX CIRCUIT. WHEN THE
HOUSINGS HAVE BEEN SEPARATED, SUPPORT THE FRONT HOUSING TO PRO-
TECT THE FLEX CIRCUIT FROM STRESS AND POSSIBLE TEAR DAMAGE.
B 4. REMOVE CIRCUIT BOARD. REFER TO FIGURE 4.4 NEXT PAGE.
IF THE UNIT YOU ARE WORKING ON HAS THE OLD STYLE OF RESONATOR
THAT OVERHANGS THE HEADS OF THE TOP TWO SCREWS, PUT THE SCREW-
DRIVER TIP IN AT AN ANGLE AND UNSCREW THEM (THEY WILL BE CAPTIVE
SO YOU WON’T BE ABLE TO COMPLETELY REMOVE THEM.) UNSCREW AND
REMOVE THE OTHER TWO SLOTTED HEAD SCREWS AT THE BOTTOM OF THE
BATTERY COMPARTMENT. IF YOU HAVE THE NEWER STYLE OF RESONATOR
WHERE THE TOPS OF THE SCREWS ARE ACCESSIBLE, UNSCREW AND RE-
MOVE THE TWO SCREWS AT THE TOP OF THE BOARD. REMOVE THE NUT
THAT IS HOLDING THE POWER JACK ASSEMBLY. THIS IS LOCATED ON THE
BACK OF THE UNIT. SLIDE OFF THE 2 CHARGING CONTACTS FROM THE
SIDES OF THE HOUSING AND PULL THE POWER JACK ASSEMBLY OUT.
REMOVE:BATTERY COMPARTMENT, PCB AND PUMP FROM HOUSING.
NOTE: AFFECTING BOTH ORIGINAL PCB AND PCB+. SOME BOARDS HAVE 2 30 GA.
WIRES ALONG SIDE THE BOARDS. THEY APPEAR TO HAVE BEEN CUT. THESE WERE
TESTING WIRES DURING MANUFACTURING (PROCESS WIRES). REMOVE THEM..DO
NOT SOLDER THEM TOGETHER.
C 1. REMOVE KEYPAD ASSEMBLY.
CAUTION:FLEX CIRCUIT IS SOLDERED TO KEYPAD BOARD AND LCD
BOARD. REMOVE THE TWO SCREWS THAT HOLD THE TWO GRAY LCD MOD-
ULE SUPPORTS TO THE BACK HOUSING. DO NOT LOSE THE TWO SMALL
SPRINGS WHEN LIFTING THE LCD MODULE SUPPORTS. THE FLEX CIRCUIT IS
VERY SUSCEPTIBLE DURING THIS OPERATION. PUSH ON THE BUTTONS TO
CAUSE THE KEYPAD ASSEMBLY TO COME LOOSE. TO CLEAN CONTACT
TRACES ON THE BOARD, GENTLY PULL THE RUBBER BUTTONS AWAY FROM
THE BOARD. THE CONTACT TRACES CAN BE CLEANED WITH SWAB DAMP-
ENED IN ALCOHOL. AFTER CLEANING, ATTACH THE RUBBER KEYPAD TO
THE BOARD BY PUSHING THE FOUR RUBBER PINS THROUGH THE BOARD
WITH A BLUNT PIN. ONCE THEY ARE PARTLY THROUGH THE BOARD, PULL
THEM THE REST OF THE WAY THROUGH WITH TWEEZERS. DO NOT ALLOW
LCD DISPLAY TO FALL OUT OF THE BACK HOUSING DURING THIS PROCE-
DURE.
D 1. REMOVE POWER JACK ASSEMBLY. REFER TO FIGURE 4.5
REMOVE THE POWER JACK ASSEMBLY BY SLIDING OFF THE YELLOW AND
WHITE WIRES WHICH ARE ATTACHED TO THE POWER JACK ASSEMBLY WITH
SMALL SLIP ON CONNECTORS. DON’T LOSE THE SMALL BLACK INSULATOR
DURING THIS STEP.
E 1. REMOVE VALVE FROM BOARD.
UNSOLDER AND STRAIGHTEN PINS AND REMOVE VALVE FROM UNDER-
NEATH THE BATTERY COMPARTMENT/BALLAST BOARD. LIFT VALVE FROM
BOARD AND DISCONNECT TUBING FROM VALVE.
pg 45