Hhu Measurement Bulb Replacement; Charger Base Repair - Respironics bilichek Service Manual

13.1 HHU Measurement Light Bulb Replacement (continued)
♦
Attach a new BiliCal™ Individual Calibration Tip to
the BiliChek hand held unit.
♦
Turn the instrument on and perform repeated calibra
tions as outlined in Section 10.1 of this manual, until a
successful calibration is achieved.
WARNING: There are no serviceable components in the
HHU. Removal of the junction screw and attempting to
separate the upper and lower housings of the HHU can cause
irreversible damage to the internal fiber-optics and will
invalidate the manufacturers warranty.
13.2 Charger Base Repair and
Replacement
The BiliChek charger base is a micro-processor controlled
“smart” charger with Deep Discharge and Recharge capabili-
ties. It requires a 12VDC 0.75 Amp (Domestic) input from
the power supply.
NOTE: Use only the power supply specified by Respironics.
1014988
Defective charger bases will be replaced at no charge during
the warranty period. After the warranty period, if desired, the
charger base may be repairable, however, attempts to remove
the main PCB can cause permanent damage to the charger.
To open and inspect/repair the charger base the following
procedure must be followed. To reassemble, reverse the
procedure.
♦
Gently remove the 4 clear plastic “feet” to expose the
4 assembly screws.
♦
Using a small tipped Philips screwdriver, remove the
4 screws.
♦
Gently separate the upper and lower case.
♦
Inspect the LED connections to ensure that they are
securely connected.
♦
Connect the charger base to the power supply being
careful not to short the PCB to tools etc. Note: Anti-
Static protection is required to prevent possible
damage to the micro-processor.
♦
Using the Schematic in Section 11.3.3 of this manual,
a standard Digital Multi-meter, Oscilloscope, and
small electronic service hand tools perform problem
diagnosis and repair.
♦
Re-apply power to the charger base and place battery
in well. Monitor BSI for correct indication (see
section 12). Reassemble the charger base.
The small spring-loaded battery contact pins in the
charger base wells can be removed and replaced in the
event they become bent or broken.
BiliChek Service Manual
33