Front Bezel; Display/Touchscreen; Printed Circuit Board (Pcb) - BIO-MED DEVICES Crossvent-2i+ Operation & Service Manual

VIII. M A I N T E N A N C E
8. When the MAIN menu appears, press the SETUP key in the lower right of the display and then press the CAL
MENU key.
9. Press VALVES and turn any three valves on by pressing OFF next to them.
10. Leave the unit like this until the battery is expended and the unit shuts down.
11. Set the ON/OFF switch to OFF if it is ON. Plug the Bio-Med Devices external power supply into the back of the
unit. This plug and jack are keyed so the red dot on the plug and jack must be aligned in order for them to engage.
Set the ON/OFF switch to ON.
12. Press the SETUP key and then the CAL MENU key.
13. Press BATTERY, press CONTINUE and enter the authorization code.
14. Press the key labeled RESET. It should display PASSED, indicating the gauge has been zeroed and you may
continue with this procedure. If it indicates FAILED, press the RESET key again. If repeated attempts still fail,
refer to the NOTE below.
15. Turn the unit off and allow it to charge the battery fully. This may take up to five hours.
16. When the battery is fully charged, unplug the external power supply, turn on the unit and run it until the battery is
expended and the unit shuts down. The battery gauge is now calibrated.
NOTE: If RESET changes to red when pressed, there has been an error. Press the key again. If it
is continually red, then there is a problem with the battery gauge chip, IC202, or communication
between this chip and the microprocessor.

3. FRONT BEZEL

1. Remove the rear panel.
2. Disconnect and remove the battery or, instead of removal, the battery may be held in place with tape.
3. Place the Crossvent on its back with the bezel facing up.
4. While holding down on the case, pull up on the edges of the bezel, first one side and then the other, working from
one side to the other until it is free. The knobs that are pressed onto the valve shaft extenders cause the resistance
to removal. The knobs will come off with the bezel as it is removed. The power switch and reset switch will
remain with the unit. Watch the button on the reset switch, which may fall off.
5. To re-install, make sure the RFI conductive gaskets are in place on the outside edges of the bezel as well as around
the display window. Also be sure the amplifying tube for the beeper on the PCB is positioned properly behind the
alarm holes in the front of the bezel. Then place the bezel over the valve shaft extenders and fit it into the case.
6. Press the knobs back on the extenders, turn the unit over and proceed in reverse order as before.

4. DISPLAY/TOUCHSCREEN

WARNING: With the backlight unplugged, high voltage is present at the backlight
connector (JBL) when the power is on.
NOTE: If the PC Board is to be removed, there is no need to separately remove the display from the
PCB.
1. Remove the rear panel.
2. Disconnect and remove the battery or, instead of removal, the battery may be held in place with tape.
3. Remove the bezel.
4. The display/touchscreen is connected to the PCB on the left side with two ribbon cables (some may have one), on
the right side with one connector to the backlight, and underneath by one ribbon cable.
display/touchscreen on its left side where it connects to the PCB and separate the backlight plug on the right side.
Leave the ribbon cable underneath the display plugged into the PCB at this point.
5. Some units will have two clamps diagonally opposed to one another on the standoffs for the display. Disengage
these.
6. Carefully lift the display/touchscreen assembly straight up and away from the PCB just until they separate. No
tools are required for this.
7. With the display separated from the PCB, tilt it slightly by lifting the right side and unplug the ribbon cable from the
PCB.
8. Re-install in reverse order.
9. If this is a new assembly, then refer to the Touchscreen calibration procedure in Part A-2 of this section to calibrate
the touchscreen once the unit is back together.

5. PRINTED CIRCUIT BOARD (PCB)

See Cautions at the beginning of this section.
1. Set the PIP and PEEP knobs fully off (CCW).
2. Remove the rear panel, battery and front bezel.
A N D S E R V I C E - C O N T .
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Unplug the