Checks Prior To Calibrations; Power Supply Check - Philips CARDIOMD Service Manual

4.2.2

Checks Prior to Calibrations

Before performing any detector calibrations, the power supplies and background radiation should
be checked.
4.2.2.1

Power Supply Check

The detector power supply receives the 55 V DC detector power through the detector cable. The
55 V is used to generate four low voltages: +15 V, +5 V, –5 V, –15 V and a negative high voltage
adjustable to –1500 V max. The 55 V is also transferred to the EDC boards for their power re-
quirements.
The power supply check procedure requires you to check the detector's low & high voltage
sources via LED indicators on the power supply and EDC board.
Note. The PMT's require a warm-up period of 24 hours to stabilize, once power is applied for the
first time during installation. References to other waiting periods in this procedure apply after this
initial warm-up period. If power has been removed for more than a 15 minute period, high voltage
must be applied for an equal period before calibration is started. The detector electronics must also
have at least 15 minutes with the cover installed to reach operating temperature. The maximum
warm-up time required is 5 hours.
Procedure
Procedure
1. Remove the detector top cover.
Five LED's inside the detector power supply
provide information about the integrity of the
output voltages.
The LED's are visible through the perforations
of the top cover. Their significance is ex-
plained in Table 4.2.
LED Name
HVHIGH
HVGOOD
HVLOW
LVGOOD
LVLOW
Table 4.2 Significance of LED's on detector power supply
Note. If the HVCal tables have not been loaded to the detector, the red HVLOW LED may be lit.
This is normal. The power supply must have HVCal table loaded before the HVGOOD LED is lit.
HVCal tables are automatically loaded when the CardioMD application is started on the PC.
1MAN0158-H11 04-2005 CSIP Level 1
Details
Location of LED's on the Detector Power Supply
Color Signifies
RED High voltage higher than specified setting
GREEN High voltage at specified setting
RED High voltage lower than specified setting or not enabled
GREEN All low voltages in specified range
RED One or more low voltages lower than specified range
Calibration
CardioMD Service Manual 4-5