Service Manual
Service Instructions
Siemens Ltd. Med Division India Version 4.0
Page 5 of 48
1.5 Control Voltages
Voltage Measuring Point Range
+5 V D915. X15.4 4.8v to 5.2v
+15 V D915. X15.5 13.5v to 16.5v
-15 V D915. X15.7 -13.5v to -16.5v
Collimator Supply D801 . X6 12V ac to 16V ac
1.6 Signals & Line voltage display:
Signal Measuring Point Range Adjustment
kVsoll D915.TP.KVS
during Exposure
2.0 ± 0.1 V for 60kV
D915.P7
mAsoll D915.TP.JRS
during Exposure
3.2 V ± 0.1 V for 160mA
D915.P6
D915.TP. IH during
Standby
1.5V± 0.1V
IH
D915.TP. IH during
Preparation
2V ±0.3V (for critically
damped mA)
D915.P5
REG: Max
Main Inv. req.
D915.TP.REG point
during exposure
15 kHz ± 0.5 kHz
D915.P4
CAL :Max
Fil.Inv. Freq
D915 TP CAL during
start up
15KHz ± 0.5 kHz
D915 .P3
The actual mains Line voltage, at 110 and 230 V supply, is being monitored for
display on the 7 segment display during first step of hand release switch for
radiography. Ensure that display value mathes with actual line voltage with allowed
tolerance ± 5 %. Using P1 potetiometer on D801 PCB, set the voltage accordingly.
This is applicalbe while replacing D915 and D801 PCB also.
If the Line voltage is less than 205 volts on on 230 V line, microcontroller switches
“ON“ the ’LN’ contactor which will support extra voltage through auto transformer
for rotating anode to run at higher speed. In preperation and exposure mode
contactor retains its position. After 5 second of each termination of radiography Line
voltage is being monitored once again.
When unit is connected to 110 V line LN contactor does not function even though
there is a variation in the supply voltage.
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