Codes; Initialisation Codes; Standby Codes - Siemens MULTIMOBIL 10 Troubleshooting Manual

2

Codes

90 EPROM Checksum Failure
96 KVsoll Failure
97 JRS Failure
99 Last Reset by Watchdog
Timer
02 +15V Supply Code
03 Iheiz < Istby
04
Iheiz > Istby
05 KVist <> 0
06
JR <> 0
33 Main Inverter Short Circuit
34 Filament Inverter Short Circuit
07
Rot ≠ 0
08 Braking Failure
01 Err signal on D950A active
31 No Charging
10 No Rotation of Rotating Anode
11 Main Inverter Short Circuit
12 KVist > kVmax
13 Iheiz > Imax OR JR > JRmax
Siemens Ltd. Med Division 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 3A. Iheiz read by the µC through Analog port
2 should be greater than 2.75A. i.e. 1.35V (Iheiz ratio : 1V = 2A)
The maximum value of Standby current permitted is
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.
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.
This Code gets activated if IGBT Drivers on D801 Card detects Short Circuit
of Filament Inverter IGBT's
The current flowing through both the windings of motor is monitored
separately. During standby Rotor should be off.RT1, RT2=0.
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.
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.
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
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.
This Code is displayed, when the drivers of the Main Inverter detect short
circuit.
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.
Maximum value of Iheiz above which Code will be displayed is 7 A (3.5V).
Version 4.0
Service Manual
Service Instructions
3.3 A.
(kVist ratio : 1 V = 20kV)
(JR ratio : 1 V = 50mA)
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