Hyosung S21685201 21685201 CDU Reception Sensor Emitting Light Sensor for MX5600
Place of Origin:
Model Number:
Hyosung S21685201 21685201 CDU optical sensor emitter. NEW Original / REBUILT / Refurbished.
Supplier: Guangzhou MicroLinkpro Technology Co.,Ltd
Telephone: (+852-93572135) , Max Liu
Email: linda.zhou@microlinkpro.com
Address:201,A12 Building, Dongjin Logistics Park No. 39 Chenjialin Road, Nan'an 511340 Xintang Zengcheng District Guangzhou City, G.D, P.R.China
What This Part Does
The S21685201 is the emitting light sensor (also called the reception sensor) in the Hyosung CDU (Cash Dispensing Unit). It's the light-source half of the optical gate pair — it emits the infrared beam that the detecting sensor (S21685202) receives. Together they form the CDU's note-tracking system, monitoring every bill as it moves from cassette to customer.
When the emitter weakens with age or the lens gets coated with paper dust, the receiver can't detect the beam reliably. The CDU controller loses track of note position and throws sensor timeout errors. This sensor works under constant stress — every note dispensed crosses its beam path. A failing emitter causes exactly the same symptoms as a failing detector, which is why experienced engineers replace S21685201 and S21685202 as a pair.
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Technical Specs
| Parameter | Detail |
|---|---|
| **Part Number** | S21685201 (also listed as 21685201) |
| **Function** | CDU Reception Sensor / Emitting Light Sensor |
| **Sensor Type** | Optical emitter (infrared LED light source) |
| **Paired Sensor** | S21685202 (detecting / receiving side) |
| **Compatible Dispenser** | CDU (Cash Dispensing Unit) |
| **Compatible ATM Models** | Hyosung MX5600, MX2900, MX2600, and CDU-equipped models |
| **Material** | Industrial-grade IR emitter, sealed lens housing |
| **Certification** | ISO |
| **Weight** | ~5g per unit |
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Compatible Models
**Hyosung MX5600T / MX5600S / MX5600TA** — Through-the-wall and lobby, full compatibility
**Hyosung MX2900** — Compact lobby dispenser
**Hyosung MX2600** — Entry-level lobby ATM
**Hyosung MX5000 / MX5200 / MX5300 series** — Multi-function ATMs
**Hyosung MX7000 / MX7600 series** — High-capacity dispenser models
**Hyosung NH1500 / NH1800 / NH2700 series** — NH platform ATMs
**Hyosung HALO series** — Drive-up and walk-up
The S21685201 fits any Hyosung ATM using the shared CDU dispenser platform. Contact us with your machine model to confirm.
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Signs You Need a Replacement
ATM reports "CDU sensor error" or "reception sensor fault"
Notes pass through the dispenser but the controller doesn't register them (beam too weak)
Intermittent "note not delivered" errors that don't correlate with physical jams
You've cleaned the sensor lenses but faults return within days (emitter is failing, not dirty)
Sensor-related error codes appearing in machine logs for the reception/CS positions
Dispenser fails calibration or sensor self-test during startup
You replaced S21685202 (detecting sensor) but faults persist — the emitter was the real problem
Emitter degradation is gradual. The infrared output drops with age, and the receiver sees a dimmer signal. What the controller tolerates today, it rejects next week. Replace early.
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Why Buy From MicroLinkpro
**OEM-grade quality** — Every sensor tested on a live CDU unit. We don't ship parts that pass visual inspection but fail under load.
**Real stock** — Both brand-new and refurbished sensors ready to ship. No fake lead times.
**Sensor pair pricing** — Buy S21685201 + S21685202 together and save. Proven approach — replace both halves of the optical gate.
**B2B pricing** — We supply ATM service companies and fleet operators. Volume discounts available.
**Technical support** — Our team has 23 years of ATM engineering experience. Can't tell which sensor is failing? We'll help you read the error codes.
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Ordering Info
| Option | Condition | Warranty |
|---|---|---|
| S21685201-NEW | NEW (Original) — Genuine Hyosung, factory stock | 12 months |
| S21685201-REBUILT | REBUILT (Made in China) — In-house manufacturing for EOL停产件 | 12 months |
| S21685201-REF | Refurbished — Tested, cleaned, budget option | 6 months |
Minimum order: 1 unit
Bulk pricing: 5+ / 10+ / 50+ tier discounts
Shipping: DHL / FedEx / UPS worldwide, typical dispatch within 48 hours
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Frequently Bought Together
| PN | Description | Why |
|---|---|---|
| S21685202 | CDU Detecting Light Sensor | Optical sensor pair — replace both halves to eliminate intermittent faults |
| 7430000224 | Note Separator | Feed-path components wear together — service as a set |
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Related Parts We Stock
| PN | Description |
|---|---|
| S21685201 | CDU Reception Emitting Light Sensor (this part) |
| S21685202 | CDU Detecting Light Sensor |
| 7430000224 | Note Separator |
| 7430000208 | Cash Cassette CDU10 |
| 7430000301 | CDU10 Transport / Throat |
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Shipping & Warranty
**Lead Time**: 1–3 business days (in stock)
**Shipping**: DHL / FedEx / UPS worldwide
**Warranty**: 90 days against manufacturing defects
**Bulk Orders**: Discount available for 5+ units
Request a Quote
📧 **linda.zhou@microlinkpro.com**
📱 WhatsApp: +852-93572135
*Include part number and quantity. We respond within 12 hours.*
*Technical team with 23 years of ATM engineering expertise.*
Technical team with 23 years of ATM engineering expertise.
Author: MicroLinkpro Technician Team
Reviewed by: Max Liu, CTO (23 years ATM engineering)
Last updated: 2026-09-24
Frequently Asked Questions
Is this an OEM original part or aftermarket?
We supply both new OEM-grade and professionally rebuilt units. Every part is tested before shipping. If you need a specific grade (new, rebuilt, or refurbished), mention it when requesting a quote.
What warranty do you provide?
12 months against manufacturing defects on NEW and REBUILT units. Refurbished units go through full functional testing and cleaning before dispatch.
Do you ship to my country?
Yes. We ship worldwide via DHL, FedEx, and UPS. Typical lead time is 1–3 business days after payment confirmation. We regularly ship to Southeast Asia, the Middle East, Africa, and Eastern Europe.
How do I confirm this part fits my ATM?
Check your machine's service manual for the part number. Send us your ATM model and serial number — our technical team (23 years of ATM engineering experience) will confirm compatibility within 12 hours.
What is the minimum order quantity?
1 unit. Bulk discounts available for 5+ units. Contact us for volume pricing.
How quickly can I get a quote?
We respond within 12 hours. Include the part number and quantity in your inquiry. WhatsApp (+852-93572135) for urgent requests.
What symptoms mean this part needs replacement?
See the "Signs You Need a Replacement" section above for the specific symptoms. If you are unsure, send us the symptoms and your machine model — we will help you diagnose before you order.
Which ATM models does this part fit?
See the "Compatible Models" section above. If your model is not listed, send us your machine type and serial number — we will confirm fitment within 12 hours.
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