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7.18 CODEs
9 0
EPROM Checksum
Failure
9 6
kVsoll Failure
9 7
JRS Failure
9 9
Last Reset by watchdog
Timer
0 2
+15V Supply error
0 3
Iheiz < Istby
0 4
Iheiz > Istby
0 5
kVist <> 0
0 6
JR <> 0
3 3
Main Inverter Short Circuit
1 1
Main Inverter Short Circuit
1 2
kVist > kVmax
1 3
Iheiz > Imax OR JR >
Jrmax
1 4
kVist < kVsoll
1 5
JR < JRS
1 7
Backup Timer
1 8
Premature Exposure
Termination
Siemens Ltd. Med India
Initialisation Codes
The EPROM Checksum is stored at 7FFEh and 7FFFh as a 16 bit word.
During self Diagnostics the software calculates the checksum of the EPROM
and compares with the stored checksum.
During Self Diagnostics the software outputs 7Fh to the D/A converter (B).
The 2.5V at the output of the D/A converter is Read by the µC through Analog
Port 4. The value read should be greater than 7Ah and less than 86h. (I.e.
between 2.39V and 2.62V)
During Self Diagnostics the software outputs 7Fh to the D/A converter (A).
The 2.5V at the output of the D/A converter is Read by the µC through Analog
Port 3. The value read should be greater than 7Ah and less than 86h. (I.e.
between 2.39V and 2.62V)
The built-in Watchdog timer (WDT) is reset by the software every 25 msec. If
due to some failure the software doesn't reset the WDT, the WDT in turn will
reset the µC after 65 msec.
Standby CODEs
The +15V supply from SMPS is polled by the µC through Analog port 0. The
+15V supply should be between +12V to +18V.
The Filament Standby current is 2A. Iheiz read by the µC through Analog port
2 should be greater than 1.75A. i.e. 1.75V (Iheiz ratio : 1V = 1A)
The maximum value of Standby current permitted is 2.2 A.
kVist is read by the µC through Analog port 7. During Standby the value of
kVist read should be Zero.
JR is read by the µC through Analog port 1. During Standby the value of JR
read should be Zero.
In standby mode if the Main Inverter Driver (Cable) is disconnected this
CODE gets activated.
Exposure CODEs
This CODE is displayed when short circuit is detected by the drivers of the
Main Inverter.
The PkV is monitored for Max.110kV. If the actual value of kV is greater than
this i.e. if the voltage cross 3.73V CODE is displayed.
Maximum value of Iheiz above which CODE will be displayed is 4.4 A (4.4V).
Maximum value of mAist above which CODE is displayed is 71mA. (3.59V)
kVist is continuously polled during exposure. The value of kVist should be
greater than 85% of kVsoll
JR is continuously polled during exposure. The value of JR should be
greater than 50% of JRS.
This CODE is displayed if regular means of terminating exposure fails and
exposure gets terminated by the backup timer. Exposure time is set for (Exp
+ Exp/4) for less than 100 ms and (Exp +Exp/10) for greater than 100 ms
Exposure Release Switch is released before the exposure is terminated by
the mAs Integrator.
Version 6.0
Copyright © SIEMENS LTD. All rights reserved. For internal use only
Service Instructions
(kVist ratio : 1 V = 20kV)
(JR ratio : 1 V = 20mA)
Service Manual
7-12