Service Manual
Service Instructions
Siemens Ltd. Med Division India
Version 4.0
Page 14 of 48
2
Codes
Initialisation Codes
90
EPROM Checksum Failure
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.
96
KVsoll Failure
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)
97
JRS Failure
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)
99
Last Reset by Watchdog
Timer
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
µ
C after 65 mSec
Standby Codes
02
+15V Supply Code
The +15V supply from SMPS is polled by the µC through Analog port 0. The
+15V supply should be b12V to +18V.
03
Iheiz < Istby
The Filament Standby current is 3A. Iheiz read by the µC through Analog port
2 should be greater than 2.75A. i.e. 1.35V (Iheiz ratio : 1V = 2A)
04
Iheiz > Istby
The maximum value of Standby current permitted is 3.3 A.
05
KVist <> 0
kVist is read by the µC through Analog port 7. During Standby the value of
kVist read should be Zero. (kVist ratio : 1 V = 20kV)
06
JR <> 0
JR is read by the µC through Analog port 1. During Standby the value of JR
read should be Zero. (JR ratio : 1 V = 50mA)
33
Main Inverter Short Circuit
If the Main Inverter Driver (Cable) is disconnected this Code gets activated.
Also if IGBT Drivers on D960 Card detects Short Circuit of IGBT’s this Code
gets activated.
34
Filament Inverter Short Circuit
This Code gets activated if IGBT Drivers on D801 Card detects Short Circuit
of Filament Inverter IGBT’s
07
Rot
≠
0
The current flowing through both the windings of motor is monitored
separately. During standby Rotor should be off.RT1, RT2=0.
08
Braking Failure
After exposure is terminated the Unit returns to Standby state and braking of
Rotor is started by allowing a DC current to flow through the KI2.During this
state which is for 8 sec after exp, RT1=0 and RT2=1.
01
Err signal on D950A active
Temperature on the heat sink of D950A exceeds it’s limit or Voltage exceeds
365v across capacitors C1~C12 or IGBT V24 on D950A is short circuit.
31
No Charging
Voltage on capacitors C1~ C12 does not increase within 3.5sec of CS picking
up or it is less than 335 V DC
Exposure Codes
10
No Rotation of Rotating Anode Anode Rotation in the Single Tank is not taking place. This Code is displayed
if any one of the RT1and Rt2 signal goes low during preparation.
11
Main Inverter Short Circuit
This Code is displayed, when the drivers of the Main Inverter detect short
circuit.
12
KVist > kVmax
The PkV and NKV is monitored for Max.68kV separately. If the actual value of
kV is greater than this i.e. if the voltages at J12.8 and J12.10 on D915 cross
4.5V, Code is displayed.
13
Iheiz > Imax OR JR > JRmax
Maximum value of Iheiz above which Code will be displayed is 7 A (3.5V).