Filament; Filament Power Supply - Siemens MAMMOMAT Balance Troubleshooting Manual

Filament

Filament power supply

X ray tube has grounded cathode and double filament (focal spot).
Tube anode current has fix stand-by current and exposure current independently adjustable for each
value of kV.
Filament current is supplied by a digitally programmable sine wave current generator.
Filament is protected by over-current and over-voltage protection circuits.
RY1
1
5
7
3
C
P 12 RESET
U
4 SRI
2 CLK
6 LD
16 PULSEK
14 PULSEA
8 FILAMENT SELECTION
On board I/f converter is connected to the CPU 01-170 digital mAs integrator for a very high resolution
mAs integration.
IC1
21 20
IRQ VCC
22 19
R/W CB2
23 18
CS2 CB1
24 17
CS1 PB7
25 16
02 PB6
26 15
D7 PB5
27 14
D6 PB4
28 13
D5 PB3
29 12
D4 PB2
30 11
D3 PB1
31 10
D2 PB0
32 9
D1 PA7
33 8
D0 PA6
34 7
RES PA5
35 6
A3 PA4
36 5
A2 PA3
37 4
A1 PA2
38 3
A0 PA1
39 2
CA2 PA0
40 1
CA1 VSS
IC6522
MAMMOMAT Balance
Troubleshooting Guide
ERROR POWER
AMPLI AMPLI
STK4044
GEN
SIN
VCA
XR2206
DAC
TP8
8043
VREF
92-079 92-073
pulse A
CN2 14
pulse K
CN2 16
+5
R13
IC4
SPB7-115.840.01
Rev.02
TP5
IFIL
CURRENT
SENSE
TP6
T 2
OUTSIN
T 1
R16
IFIL
LED5 R12
R11
TP4
C13 IC5
1
CUROUT VCC
2
CUREF COMPIN
3
FROUT THRES
R14
4
GND R/C
RV4
LM331
Page 26 of 62
10.04
TUBE
L S
A M
R A
G L
E L
FILAMENT
SAFETY
RV6/7
RY4
RY3
TP2
VTP2=1V/10mA
+13.5
R15 C15
8 R17
7
TP2
6
5 +
C14 C16
R16
-
Filament
LED5
10mA=1khz
TP4
V
F
MASMETER
LM331
1V=10mA
1V=1khz
Siemens AG
Medical Solutions