Sedecal SHF-310 - Page 287

HF Series Generators
T roubleshooting
TR-1005R4
47
ACTIONS
A. THERE IS NOT SUPPLY IN FILAMENT BOARD, OR POOR CONNECTION ON THE
CATHODE HV CABLE, OR DEFECTIVE FILAMENT TRANSFORMER, OR DEFECTIVE HV
SWITCH.
For Generators with two tubes:
-- if the error appears in both tubes, go to step 1.
-- if the error appears in only one tube, interchange HV Cables.
-- if error remains when selecting the same tube from Console, replace HV
Transformer, if does not appear go to step 8.
1. Check through the X-ray tube window if the selected filament is On. Check both circuits to detect
which one is causing the error code.
2. If none lit when selected, check in the DC output on the BR1 rectifier (324 Dc approx.) or input
voltage (220 VAC approx.). If input voltage is OK and output voltage is not OK, replace rectifier.
If it is OK go to step 3.
3. Check if the Led’ s DS1 and DS2 are ON in the Filament Board. If they are not, replace the Board.
4. If everything is OK, check DC voltage between P2-4 and P2-1 (324 DC approx.). If not enough
voltage detected, review circuit between BR1 and T2 transformer. Replace Filament Board if
defective.
5. If it is OK, check the AC voltage between pin 4 on connector P3 on Filament Board Fil. Sup.) and
pins 15 or 16 (depending on filament selection) on connector P4 on Interface Control Board. The
range should be between 90 and 200 V AC.
6. If not, check voltage in Pin 17 of connector P4 at Interface Control Board and Pin 4 of connector
P3 at Filament Board, also Check P14and 14 of connector P4. If not, replace the Interface Control
Board.
7. If it is OK, check continuity between HV Transformer connector and Interface Board.
8. If it is OK, check continuity of HV Cable connector (between common C and S (Small Focus)
and between common C and L (Large focus). The OHM value should be very low in both cases
( 0.01 approx.)
9. If it is OK, replace the HV Transformer. If it is not OK, check all connections from HV Cable to
the tube. Replace cable if necessary.
10. If HV Cable is OK, check tube filaments. Replace Tube if necessary .
Note .