Siemens MOBILETT Plus Service Instructions Manual page 53

HT and single tank error diagnosis
Exposure values, 133 kV 5 mAs, HTPOS & HTNEG 2 V/div,
20 kV/div; 200 µs/div (only the end of the exposure is shown)
HTPOS on
D1
HTNEG on
D1
Fig. 6 HT-signal, Arcing between plus and minus side (Defective tube). Replace single tank.
Siemens-Elema AB
Solna, Sweden
SPR8-215.898.02
Rev. 01 01.02
Page 9 of 12 MOBILETT Plus/ Plus E
SPS-UD
6 - 9