Mobile fluoroscopies · LORAD family

Hologic LORAD Premier Encore: troubleshooting and error codes

The ServiceForge knowledge base holds 19 documented symptoms for the Hologic LORAD Premier Encore, with 28 ranked causes, 82 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Totally blank video monitors

Both monitors display no image, text, or brightness after power on and initialization

Ranked causes

1. Power supply failure or blown fuses (common)
2. Loose integrated circuit in socket (occasional)
3. Video PCB failure (occasional)
4. Monitor brightness/contrast set too low (common)

First check

Observe if system beeps when powered ON

Test point: System audio output
Expected: System beeps upon power ON

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No video signal from camera to console

Monitors receive no video input from camera; camera not outputting video or no power to camera

Ranked causes

1. Video cable between camera and J14 damaged or disconnected (common)
2. Camera lacks 12V dc power (common)
3. Image Intensifier failure (occasional)

First check

Measure resistance across BNC connector J14 to camera with power off

Test point: BNC connector at J14 on Video PCB to camera return
Expected: About 6K ohms, approximately

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Positional laser crosshair not displayed radiation

One or both laser crosshairs missing when laser switch pressed on head assembly

Ranked causes

1. Faulty positional laser (side or rear) (occasional)
2. Laser Power Board defective (occasional)
3. Laser Switch defective (rare)

First check

Measure voltage across positional laser connector

Test point: J3 or J4 pins on Laser Power Board
Expected: greater than +4 V, >
Tools: Digital voltmeter

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

DC power supply 5V output out of specification

5V supply voltage measured at power supply output or TP1 outside acceptable range

Ranked causes

1. 5V fuse blown or open (occasional)
2. Switching power supply regulator failure (occasional)

First check

Measure +5V output voltage

Test point: TP1 or power supply output terminals
Expected: 5.15 V +0.00, -0.05 V, +0.00, -0.05
Tools: Digital voltmeter

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

No beam on indicator or timer when footswitch depressed

Footswitch pressed but timer does not count and Beam On indicator does not light

Ranked causes

1. Footswitch or footswitch cabling failure (common)
2. Footswitch or cabling defect confirmed (common)

First check

Press and hold footswitch and observe timer and Beam On indicator

Test point: Timer display, Beam On indicator light
Expected: Timer counts up, Beam On indicator lights

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Automatic Dose Settings radiation

Configuration of automatic dose rate (ADR) parameters for imaging optimization

Ranked causes

1. Incorrect ADR parameter values requiring adjustment for proper dose delivery (occasional)

First check

Verify Top White setting

Test point: ADR settings menu
Expected: 105

6 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Beam Collimation radiation

Adjustment of collimator assembly to ensure round, centered X-ray beam at 6" and 4" aperture settings after HVPS or X-Ray Tube Assembly replacement

Ranked causes

1. Collimator misalignment after component replacement (common)

First check

Verify system powers on and displays default 40 kV, 0.020 mA

Test point: Left monitor
Expected: 40 kV and 0.020 mA displayed

6 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: C-Arm Calibration radiation

Calibration of X-ray kilovolt and milliampere output, and feedback voltage measurement to establish proper dose parameters for imaging

Ranked causes

1. Miscalibrated kV and mA output or feedback voltage after system setup or component replacement (common)

First check

Verify system startup and default power display

Test point: Left and right monitor screens
Expected: Left monitor displays 40 kV and 0.020 mA; right monitor prompts for password

4 more checks with pass and fail actions, 15 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Camera focus radiation

Image focus requires adjustment to achieve optimal resolution on monitor

Ranked causes

1. Camera lens out of focus (common)

First check

Position C-Arm with Image Intensifier on top

Test point: C-Arm
Expected: Image Intensifier on top, locked into position

4 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Camera focus adjustment radiation

Fine adjustment of camera lens focus for optimal image resolution

Ranked causes

1. Focus ring needs fine adjustment (common)

First check

Adjust focus ring while observing image on monitor

Test point: Focus ring (silver anodized) on camera lens assembly
Expected: Image sharpness improves with ring rotation lp/mm, 6.5-7.5 lp/mm

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Camera Gain Adjustment radiation

Calibration of image intensifier iris and camera gain parameters for optimized image quality at 4-inch and 6-inch aperture settings

Ranked causes

1. Incorrect camera iris position or gain values requiring adjustment after collimation or C-arm calibration (common)

First check

Verify 6-inch camera gain setting

Test point: Calibration menu
Expected: 165

4 more checks with pass and fail actions, 10 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: kV and mA output verification radiation

Verify and calibrate kV and mA output settings to ensure accurate beam control in manual and auto modes.

Ranked causes

1. Manual verification required for preventative maintenance (common)

First check

Manual mode: foot pedal at 0.050 mA

Test point: TP12 (Gnd) to TP2 (kV Out)
Expected: 2.38 ±5% VDC, ±5%
Tools: Digital voltmeter

12 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Positional laser alignment radiation

Side and rear laser crosshairs require alignment to target lines on Image Intensifier cover

Ranked causes

1. Side and rear positional lasers misaligned (common)

First check

Copy Laser Target Template from Appendix B

Test point: Documentation
Expected: Template copied and ready

19 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

High voltage arcing during X-ray operation high voltage

Sharp muffled snap sound heard during X-ray operation; may occur once or repeat; indicates possible electrical arc

Ranked causes

1. Tube housing coolant leak allowing air into tube housing (common)

First check

Listen for sharp muffled snap sound during X-ray operation

Test point: System audio during footswitch depression
Expected: No arcing sounds

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Kilovoltage control calibration radiation

Verify kV output control voltage accuracy at various kilovoltage settings

Ranked causes

1. Control circuitry miscalibration or drift (common)

First check

Measure kV Out control voltage at 40 kV setting

Test point: TP1 pin 2 (kV Out) to ground (pin 10, 11 or 12)
Expected: 1.39 ±5% VDC, ±5%
Tools: Digital voltmeter

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low kV reading during X-ray operation high voltage

kV reading is lower than expected during mid-range power settings with footswitch depressed

Ranked causes

1. High voltage power supply failure (common)

First check

Set system to 55 kV and 0.057 mA via F10 key; observe kV reading with footswitch depressed

Test point: Display kV readout
Expected: kV reading approximately 55

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low mA reading during X-ray operation radiation

mA reading is lower than expected during mid-range power settings with footswitch depressed

Ranked causes

1. X-ray tube failure or malfunction (common)

First check

Set system to 55 kV and 0.057 mA via F10 key; observe mA reading with footswitch depressed

Test point: Display mA readout
Expected: mA reading approximately 0.057

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Milliamperage control calibration radiation

Verify mA output control voltage accuracy at various milliamperage settings

Ranked causes

1. Control circuitry miscalibration or drift (common)

First check

Measure µA Out control voltage at 0.020 mA setting

Test point: TP1 pin 4 (µA Out) to ground (pin 12)
Expected: 0.95 ±5% VDC, ±5%
Tools: Digital voltmeter

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

System does not initialize completely

System startup stalls with 'System Startup...Please Wait' message on left screen, communication difficulty between PC Controller and X-ray or Video PCB

Ranked causes

1. PC Controller wiring connections not properly seated (common)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.