Medical imaging equipment · Horizon family

Codonics Horizon: troubleshooting and error codes

The ServiceForge knowledge base holds 41 documented symptoms for the Codonics Horizon, with 43 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

Donor Carriage in UP position during parking caution

Donor Carriage found in raised position during manual parking procedure

Ranked causes

1. Donor Carriage positioned in UP position (unknown)
2. Color Printing Ribbon installed in unit (occasional)

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

PostScript print driver configuration for Windows workstation

Setup procedure for configuring Windows 98, Me, NT 4.0, 2000, or XP workstations to print PostScript jobs to Horizon imager

Ranked causes

1. PostScript driver and PPD file installation required (common)
2. Horizon imager must be added as Windows desktop printer (common)

First check

Confirm PostScript driver installation on workstation

Test point: Windows Printers folder or Print from any Windows application
Expected: Horizon PostScript driver listed and available for selection
Tools: Windows Printers control panel

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

Cable Retainer mounting screw cross-threading risk caution

Screws at odd angle to aluminum Torque Tube; risk of cross-threading and stripping during Cable Retainer installation

Ranked causes

1. Improper screw insertion technique due to odd angle geometry (common)

First check

Verify screw alignment before insertion

Test point: Cable Retainer outer screw locations
Expected: Screws start cleanly without binding or resistance

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

Cables pinched or routed incorrectly caution

TPH skewed, imager failure, imaging problems such as insufficient thermal contact or skewed images on prints

Ranked causes

1. Cables not adjusted properly or routed loosely (common)

First check

Verify cables are not pinched and routed loosely

Test point: Cable routing at specified locations
Expected: Cables routed loosely, not pinched

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

Calibration: Darkside Cover assembly replacement parameters caution

Torque and fastener specifications for Darkside Cover replacement

Ranked causes

1. Fastener specifications for assembly (unknown)

First check

Verify correct fastener type

Test point: Screws 8-32 X 1/2 TORX PLUS PAN HEAD
Expected: 700-027-001 fasteners identified (qty 3)

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

Calibration: Film calibration

Optimization of image quality on printed sheets for DirectVista grayscale film cassettes

Ranked causes

1. First-time cassette insertion or manual recalibration needed (common)

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

Calibration: Internal Densitometer

Recalibrate internal densitometer to match external reference standards for DirectVista grayscale film

Ranked causes

1. Densitometer requires calibration adjustment (common)

First check

Insert correct DirectVista grayscale film type cassette

Test point: imager cassette slot
Expected: DirectVista grayscale film of desired type loaded

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

Calibration: Internal densitometer calibration

Recalibration of the imager's internal densitometer used to read optical densities during film calibration

Ranked causes

1. Densitometer accuracy drift or periodic maintenance (occasional)

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

Calibration: Power supply unit high voltage

Post-replacement PSU calibration procedure with digital multimeter readings and terminal verification

Ranked causes

1. Power supply replacement requires calibration verification (common)

First check

Verify third multimeter reading matches expected calibration value

Test point: Digital Multi Meter display
Expected: As per calibration procedure (specific value not stated in excerpt)

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

Calibration: Print length

Images run off or print short of the bottom of DirectVista film sheet. Performed at imager control panel using menu options to generate Instruction, Ruler, and Calibration sheets.

Ranked causes

1. Print length out of calibration (common)

First check

Access Main Menu at control panel

Test point: Control panel keys
Expected: Main Menu with administrative options displays

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

Calibration: Print length calibration

Correction for images running off or printing short of the bottom of a sheet

Ranked causes

1. Image positioning drift relative to sheet margins (occasional)

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

Calibration: Thermal Print Head

Compensation for thermal print head non-uniformities. Recommended every 5000 sheets or 12 months. Perform if prints show vertical streaks or bands after cleaning.

Ranked causes

1. Thermal print head non-uniformity compensation required (common)

First check

Initiate calibration from control panel

Test point: Control panel keys
Expected: Main Menu with administrative options displays

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

Calibration: Thermal print head calibration

Characterization of thermal print head to compensate for non-uniformities in imaging properties

Ranked causes

1. Non-uniformities in print head imaging properties (common)

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

Carriage assembly completion caution

Final assembly steps for Picker Carriage replacement including skin attachment and hardware configuration verification

Ranked causes

1. Carriage reassembly required (common)

First check

Torque Darkside Skin screws

Test point: 3 x (700-027-001) 8-32 x ½ Screws
Expected: 13 in-lbs +/- 1.0, +/- 1.0
Tools: T20 Bit Torx Screwdriver, torque wrench

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

Clutch motor replacement required caution

Donor clutch motor needs removal and replacement during maintenance procedure

Ranked causes

1. Clutch motor wear or failure (unknown)

First check

Locate and remove screws securing supply clutch motor

Test point: Supply clutch motor mounting
Expected: 2 screws removed

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

Color Printing Ribbon still installed

Color Printing Ribbon may remain in the unit during manual parking procedure

Ranked causes

1. Color Ribbon present in unit (occasional)

First check

Inspect for Color Printing Ribbon

Test point: Donor cavity
Expected: Color Ribbon present or absent

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

Darkside cover installation

Replace Horizon Darkside Skin assembly on the unit

Ranked causes

1. Darkside skin assembly requires replacement (unknown)

First check

Position new Darkside Skin assembly on bottom of unit

Test point: Bottom of Horizon unit
Expected: Assembly latches and aligns with greatwall

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

Darkside Skin attachment

Darkside Skin installation on adjusted Picker Carriage with specified fasteners and torque

Ranked causes

1. Darkside Skin requires attachment after carriage adjustment (unknown)

First check

Fasten Darkside Skin with correct torque

Test point: 3 x 8-32 x ½ Screws
Expected: 13 in-lbs, +/- 1.0
Tools: T20 Torx Screwdriver, torque wrench

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

Donor Carriage dislodged from belts during manual lowering caution

Donor Carriage becomes misaligned or detached from its drive belts when manually moved during parking procedure

Ranked causes

1. Uneven or rapid downward pressure on Donor Carriage during manual lowering (common)

First check

Verify Donor Carriage is fully lowered and seated properly on belts

Test point: Donor Carriage position
Expected: Carriage at bottom of unit, seated evenly on belts

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

Donor carriage dislodged from belts during manual parking caution

Donor carriage becomes misaligned or separated from its drive belts when being manually lowered during the parking procedure.

Ranked causes

1. Donor carriage pushed down unevenly or too quickly during manual lowering (common)

First check

Verify donor carriage is fully seated in lower position

Test point: Donor Carriage position
Expected: Donor Carriage fully down into the bottom of the unit

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

Donor Carriage found in UP position caution

Donor Carriage is in the raised position and must be lowered during manual parking procedure

Ranked causes

1. Donor Carriage in UP position during parking (unknown)

First check

Verify Donor Carriage position

Test point: Donor Carriage
Expected: Fully down at bottom of unit

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

Ground Strap routing and connection

Ground Strap from Control Arm must be routed under Power Supply Cables and secured to proper location with Ground Terminal pointing toward printer center

Ranked causes

1. Incorrect Ground Strap routing or terminal orientation (occasional)

First check

Verify Ground Strap routing path

Test point: Ground Strap from Control Arm
Expected: Strap routed underneath Power Supply Cables to designated location

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

Hardware configuration not set or incorrect patient safety

Horizon Imager fails to print or initialize because hardware configuration was not set or specified incorrectly during initial power-up

Ranked causes

1. Hardware configuration not specified during initialization (common)

First check

Verify Hyperterminal console connection and prompt

Test point: Console port (rear of Horizon Imager)
Expected: /home/wet_tools #

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

Imager failure or imaging problems caution

Skewed images on prints, insufficient thermal contact, imager failure due to improperly routed cables

Ranked causes

1. Cables pinched or improperly routed during PSU replacement (common)

First check

Verify cables are not pinched and routed loosely at specified locations

Test point: Cable routing path
Expected: Cables not pinched, routed loosely at all specified locations

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

Imager failure or imaging problems from pinched cables caution

Insufficient thermal contact, skewed images on prints, or complete imager failure due to improperly routed cables

Ranked causes

1. Cables pinched or routed improperly during PSU replacement (common)

First check

Verify cables are not pinched

Test point: Cable routing locations per diagram
Expected: Cables routed loosely without pinching

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

Improper gear mesh between motor and clutch gears caution

Black gear does not rotate freely or has excessive resistance when green gear is held; indicates misalignment of motor bracket on take-up clutch

Ranked causes

1. Motor bracket misaligned or over-tightened on take-up clutch (common)

First check

Verify gear mesh and backlash between motor and clutch gears

Test point: Motor gear and clutch gear interface
Expected: Black gear rotates a little (backlash present) when green gear is held stationary

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

Insufficient thermal contact caution

Thermal printer head lacks adequate contact with print media or heating element

Ranked causes

1. Improper cable routing causing mechanical stress on TPH assembly (occasional)

First check

Verify cable routing does not stress TPH assembly

Test point: Cable connections and routing near TPH
Expected: Cables loose, not pulling on TPH mounting

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

Motor connections disconnected during Power Supply removal caution

Unit fails to operate if Motor Connections near blowers become disconnected during Power Supply removal procedure

Ranked causes

1. Motor Connections inadvertently disconnected while removing TPH Power Cables (common)

First check

Verify Motor Connections near blowers remain seated and connected

Test point: Motor Connections near blowers
Expected: Firmly connected

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

Picker Carriage down position adjustment caution

Picker Carriage moved down using crescent wrench with vertical wrench orientation

Ranked causes

1. Picker Carriage requires downward adjustment (unknown)

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

Picker Carriage position adjustment caution

Picker Carriage needs to be moved up or down to correct position using sheet metal bending technique

Ranked causes

1. Picker Carriage out of correct position (unknown)

First check

Verify Picker Carriage position with gauge after adjustment

Test point: Picker Position Gauge
Expected: Carriage in correct position

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

Picker Carriage position incorrect caution

Picker Carriage not in correct vertical position after adjustment; requires repositioning using adjustment procedure

Ranked causes

1. Picker Carriage misaligned during reassembly (common)

First check

Verify Picker Carriage vertical position with gauge

Test point: Picker Carriage position
Expected: Position matches Picker Position Gauge specification
Tools: Picker Position Gauge

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

PostScript print jobs print on wrong media or at wrong size

Images render on incorrect media type/size or at incorrect dimensions when printing from non-standard PostScript applications that bypass GDI methods

Ranked causes

1. Missing DSC (Document Structuring Conventions) comments in PostScript job stream (common)

First check

Print to file from application using Horizon print driver and examine file for DSC comments

Test point: First 500 lines of PostScript file
Expected: DSC comments beginning with 'CX' present (e.g., CXMediaType, CXMediaSize)
Tools: Text editor

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

Replace Horizon Dark Side Cover caution

Procedure to remove and replace the Dark Side Cover assembly on Horizon imager

Ranked causes

1. Dark Side Cover replacement required (unknown)

First check

Shut down Horizon Imager via front panel

Test point: Front panel controls
Expected: Imager powered down

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

Reset densitometer to factory calibration

Reset internal densitometer calibration data to factory settings

Ranked causes

1. Densitometer calibration data needs factory reset (occasional)

First check

Access Main Menu with administrative options

Test point: imager control panel
Expected: Main Menu with administrative options displays

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

Reset print length calibration to factory setting

Reset calibration data to factory default values at imager control panel.

Ranked causes

1. Calibration reset needed to factory values (occasional)

First check

Access Main Menu at control panel

Test point: Control panel keys
Expected: Main Menu with administrative options displays

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

Skewed images on prints caution

Images appear skewed or distorted on thermal printer output

Ranked causes

1. Cables pinched or improperly routed (common)

First check

Inspect cable routing and tension

Test point: Cable paths at PSU and TPH connections
Expected: Cables not pinched, routed loosely

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

Smart Card transfer to swap imager

Swapping imagers for service requires moving the Smart Card containing license code and configuration data from original to replacement unit

Ranked causes

1. Service imager swap requires Smart Card relocation (common)

First check

Power status of both imagers

Test point: Power switch
Expected: Both imagers powered off

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

TPH skewed or imaging problems after PSU replacement patient safety

Skewed images on prints, insufficient thermal contact, or imager failure due to improperly routed cables during PSU replacement

Ranked causes

1. Cables pinched or routed improperly during PSU installation (common)

First check

Inspect cable routing at all specified locations

Test point: Cable paths near TPH mounting
Expected: Cables not pinched, routed loosely without strain

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

Unit fails to operate after power supply removal caution

Motor connections near blowers become disconnected during power supply extraction, preventing unit operation

Ranked causes

1. Motor connections near blowers disconnected during PSU removal (common)

First check

Verify motor connections near blowers are fully seated

Test point: Motor connectors at blower assemblies
Expected: All connectors fully mated and secure

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

Unit operation testing after cover installation

Verify unit operation by inserting media trays and queuing status prints

Ranked causes

1. Verification of proper unit operation after installation (unknown)

First check

Remove all media trays from unit

Test point: All tray slots
Expected: All trays removed

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

VanGogh shields installation

Installation and torque specification for VanGogh shields after PSU replacement and calibration

Ranked causes

1. PSU replacement requires shield and cover reinstallation (common)

First check

Install and torque VanGogh shields

Test point: VanGogh shield mounting screws
Expected: 13 in-lbs +/- 1.0, +/- 1.0
Tools: T15 Torx Screwdriver, torque wrench

1 more check with pass and fail actions, 2 corrective actions, 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.