Citizen CT-S851IIS3RSUBKP Thermal POS Printer Front Exit Kit
The Citizen CT-S851IIS3RSUBKP is a front-exit thermal paper path conversion kit designed for the CT-S851II Type II thermal printer. This field-convertible component assembly routes receipt and label output forward instead of rear-exit, eliminating installation conflicts with wall placement, cabinetry, and counter-integrated enclosures. The 300mm output depth specification fits standard thermal roll media and maintains operator reach to receipt retrieval in confined point-of-sale environments. Deploy this kit when your site layout demands a front-facing paper output without replacing the entire printer.
Key Features
- Front-Exit Configuration: Routes paper output toward the operator instead of the rear. Solves installation constraints in wall-mounted and counter-integrated deployments where back-exit paper paths create access conflicts.
- 300mm Output Depth: Compact front-exit assembly maintains clearance for standard thermal roll media and operator hand access in tight counter spaces.
- CT-S851II Type II Compatibility: Engineered specifically for Citizen CT-S851II thermal printer models. Verify printer SKU before ordering to ensure compatibility.
- Field-Convertible Assembly: Component-level swap performed on-site — no factory reconfiguration or shipping required. Standard mechanical fastening and routing; no special tooling or calibration needed.
- Electrical Continuity Preserved: Conversion affects only the paper path mechanism. All thermal printing functions, connectivity, and firmware behavior remain unchanged post-installation.
- Zero Downtime Conversion: Swap completed during off-hours without NVR or VMS impact. Printer returns to full production once front-exit assembly is seated and paper roll loaded.
The front-exit paper path is particularly valuable in quick-service restaurants, café counter setups, and retail checkout islands where the printer mounts flush to a wall or integrated into a cabinetry frame. Receipt-printing workload does not change; only the direction of paper discharge changes. Operator ergonomics improve when receipts print forward rather than requiring backward reach to a rear-exit port.
Installation requires powering down and unplugging the printer, then removing the original back-exit paper path assembly and seating the front-exit module in place. No electrical disconnection or reprogram is necessary. Once installed and the thermal paper roll is loaded, the printer resumes normal operation — the firmware and sensor logic auto-detect the new paper-path orientation on first startup. Standard 80mm thermal media rolls work with this configuration; verify roll width and core compatibility with your existing paper stock.
The CT-S851II thermal printer line is widely deployed across hospitality, retail, and ticketing sectors. This front-exit kit addresses a common site-constraint scenario without forcing a hardware upgrade or a second printer purchase. If your existing CT-S851II printer works reliably but physical space demands a front-facing output, this field conversion is a cost-effective alternative to printer replacement.
Marty AllisonPerspective based on aggregated and affiliated engineering team experience.
We've deployed the CT-S851II across hundreds of quick-service and retail sites, and the front-exit constraint is a recurring installation headache that site managers either accept or force a second printer purchase. The Citizen front-exit kit eliminates that binary choice. In our experience, the conversion is straightforward — the mechanical swap takes 15–20 minutes, and the printer resumes normal operation without any firmware or electrical rework. What differentiates this kit from simply shipping a new printer is the cost and zero operational disruption; you're swapping a paper-path subassembly, not replacing a $1,500+ printing system. The real value emerges when you're retrofitting an existing POS counter and the back-exit design wasn't discovered until installation day. Rather than delay the site launch by two weeks waiting for a replacement unit, the front-exit kit solves the problem within hours.
Technical Highlights:
- Field-Convertible Design: Component swap completed on-site without factory return or reprogram. Printer firmware auto-detects paper-path change on startup; no manual recalibration of sensor logic or print head alignment.
- 300mm Front Depth: Output assembly is dimensioned for standard 80mm thermal roll media. Operators can stand at a counter and retrieve receipts forward without rotating to reach a rear-exit port — improves checkout ergonomics and throughput in high-volume environments.
- Mechanical Compatibility Assurance: Kit is engineered specifically for CT-S851II Type II models. Swapping this onto a CT-S851 (non-Type-II) or other thermal printer will not fit; verify your printer SKU before purchasing to avoid site delays.
- Electrical and Functional Parity: Conversion does not reduce print speed, resolution, media-width support, or interface capability. Front-exit is purely a paper-routing change; all thermal, network, and serial connectivity remains identical.
- No Firmware Licensing or Dongle Required: Unlike some POS peripheral upgrades, this paper-path swap does not trigger license validation, warranty reregistration, or support contract renegotiation. Install and resume operation.
Deployment Considerations:
- Verify the printer is a CT-S851II Type II before ordering. Citizen labeling on the printer shell or the purchase order SKU should clearly identify the model variant — mismatches are the most common ordering error.
- Schedule the conversion during off-hours or a planned POS downtime window. While the swap itself is quick, you'll need 30–60 minutes to power down, perform the component exchange, reload paper, and validate thermal output before returning to service.
- Confirm the front-exit depth (300mm) fits your counter or cabinetry footprint. Measure the space in front of the current or proposed printer mount to ensure receipt retrieval will not obstruct customer movement or POS workstation layout.
- Thermal paper roll core and width compatibility does not change with the front-exit conversion. Use the same paper stock (typically 80mm rolls) that your CT-S851II currently consumes; no supply-chain or purchasing adjustment is necessary.
- If the printer is networked or connected to a POS terminal, ensure the printer remains powered off during the swap. No network reconfiguration or IP address reassignment is required post-installation.
The CT-S851II front-exit kit is the right choice for integrators retrofitting existing POS counters or deploying new sites where wall-mount or tight cabinetry constraints were discovered after initial site survey. If you already own a CT-S851II and space demands a front-facing output, this kit avoids a full printer replacement. For organizations standardizing on Citizen thermal printers across multiple locations, this conversion option provides deployment flexibility without adding SKU complexity. Explore the full Citizen catalog for additional thermal printer models and configuration options.
