APX 525/625 Generator Revision C Diagnostics
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 164
4. Check for correct connections for main, common, and phase wires
5. Check for presence of the rotor current sense DC voltages during boost (anodes
of CR2 & CR3 on the mA / Rotor PCB)
6. Check for Rotor OK (Low True) signal on the mA / Rotor Board at R25
Do you have filament current?
On the I/O Board (124-0107G1) check:
1. Presence of regulated DC supply voltage for filament drive primary switching
circuitry (center tap of transformer T4)
2. Fuses F2 and F3
3. Do relays K2 and K3 close on PREP?
4. Presence of drive pulses at input and output sides of U1 on I/O Board
5. Switching drive signals on primary sides of filament drive isolation transformer on
I/O board
6. Presence of PREP signal (Low True) at R3 on I/O Board
7. Confirm activation of Q3 transistor (Collector pulls R10 to GND - this enables U1
to gate the filament drive pulses to the switching transistors).
On the Power Supply Board (124-0108G1) check:
1. Presence of unregulated DC supply voltage at fuse F3
2. Fuse F1. (AC voltage to the rectifier diodes)
3. Fuse F3
4. Presence of regulated filament voltage at TP1 (This voltage may vary, depending
on tube selection. Typical voltages may be +3 VDC in standby and between +12
to +17 VDC in PREP)
5. Filament reference voltage at R7
6. Drive pulses at R17 or the collector of Q2
7. Verify that K2 is activated. (From mA / Rotor Board – U11 pin 4)
READY LIGHT IS ACTIVE, BUT NO EXPOSURE OCCURS
Is the Table or Wall Bucky selected?
Exposure will not take place unless the “Bucky in Motion” switch is closed when
either Bucky is activated. The AEC requires that the wall or table receptor be
selected. Systems without Wall Buckys should have the TB4 pin 2 to pin 4 inputs
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