Service Manual
Service Instructions
Siemens Ltd. Med India
Version 6.0
Copyright
SIEMENS LTD. All rights reserved. For internal use only
7-6
Switch the Unit OFF.
7.6.2 Checking the fuses
Open the front cover of the control unit .
Loosen the Fuse carriers which are mounted on the base of the control unit and check
the continuity of fuse link . If fuse link has responded for overcurrent replace the Fuse
Link.
Checking the fuses on D920
F1
0.25 AT
T1 transformer primary
F2
0.630 AT
240 V for X-ray table.
F3
0.630 AT
24 V for K3,K4,K5 relays
F4 10 AF
Collimator supply
F5
4 AT
Filament circuit.
7.6.3 Checking the LEDs on D920
Switch the Unit ON.
After the initialisation, the default data 60 kV and 10 mAs are displayed at first time
switch ON or last stored kV & mAs value.
7.6.3.1
Standby mode
On D920 the following LEDs are illuminated :
V3
Main line voltage 240 V.
V9
Presence of 240V.
V12
Presence of 24 V for relay
V15
Presence of 12 V for collimator
V25
Presence of 24V for filament circuit
7.6.3.2
Preparation ON
On half press of exposure release switch unit should go in preperation mode.
In addition, V22 (green) lights up on D915.
7.6.3.3
Exposure Mode
On the second step of exposure release switch ,unit enters in radiograpy mode.
In addition, V23 (green) for exposure lights up on D915.
7.6.3.4
CODE message
NOTICE
If the Unit can not be switched ON Check Supply at
Socket.Check Continuity of mains cable with the Plug
pins.Check Over Current Protective devices MCB and U1 & U2.
