Procedure 11 - Replacing P.c. Boards - Invacare 6LXO2 Service Manual

PROCEDURE 11
PROCEDURE 11 - REPLACING P.C. BOARD(S) (FIGURE 1)
TO PREVENT ELECTRICAL SHOCK, ALWAYS DISCONNECT CONCENTRATOR FROM
P
ELECTRICAL OUTLET BEFORE SERVICING.
C
1. Unplug unit.
B
2. Remove cabinet (Refer to PROCEDURE 1 - REMOVING CABINET).
O
3. Remove control panel (Refer to PROCEDURE 9 - REMOVING CONTROL PANEL).
A
R
D
ONLY QUALIFIED SERVICE TECHNICIANS SHOULD MAKE ANY CHANGES TO THIS EQUIPMENT.
S
These are precautions that should be followed to prevent damage to the P. C. boards:
Before handling any P. C. boards, you need to be properly grounded to prevent static damage to
the components of the board. A Static Cuff must be worn and properly grounded using an alliga-
tor clip. Electrical conduit or a water pipe is normally sufficient when a known good ground is not
available. Care should be taken to ensure that alligator clip contact with bare metal surface.
When removing quick disconnects, DO NOT pull on wire itself as damage to the connector or
solder joint may occur. Hold down the P. C. board with one hand and use an upward force with a
slight rocking motion to remove the terminals.
Before installing any P. C. boards, ensure that all insulators are in place.
4. Remove Sensor Wiring Harness Jumper (P2) from P.C. board(s) to be replaced.
5. Disconnect the following:
DO NOT remove sensor tubing from P.C. Board. Remove from tee fitting ONLY. Damage to
sensor assembly could occur.
3LX, 5LX and 5LXO2 before S/N97JXXXX
Sens O2 (Top) P.C. Board (5LXO2 ONLY):
a) Sensor tubing from "T" fitting behind control panel (Refer to PROCEDURE 9 - REMOVING
CONTROL PANEL).
Control (Bottom) P.C. Board (3LX, 5LX, 5LXO2):
a) Wiring Harness from 9-Pin Wiring Harness Connector (P1).
b) Wiring Harness from 8-Pin Wiring Harness Connector (P5).
c) Transformer connector (P3).
d) Pressure transducer tubing from product tank.
Integrated Board (5LXO2/5LXO2T/6LXO2/6LXO2T) After S/N97JXXXX
a) Wiring Harness from 9-Pin Wiring Harness Connector (P1).
b) Wiring Harness from 8-Pin Wiring Harness Connector (P5).
c) Transformer connector (P3).
d) Pressure transducer tubing from product tank.
e) Oxygen Sensor tubing from "T" fitting behind control panel (Refer to PROCEDURE 9 - REMOVING
CONTROL PANEL).
f) Wiring Harness from 4-pin wiring harness connector (P6) [5LXO2T, 6LXO2T Telemetry Unit ONLY].
Remote Display Board
a) Sensor wiring harness if not disconnected in STEP 1.
6. Pinch end of each stand-off with needle-nose pliers and remove the P.C. Board(s).
CAUTION
WARNING
CAUTION
48
P.C. BOARD REPLACEMENT