ATM Card Reader Magnetic Heads: NCR, Diebold, Wincor and Hyosung Compatibility Guide
A practical cross-reference for ATM dip and motorised card-reader magnetic heads — covering Diebold IX, Wincor V2X / V2CU / ID18, NCR 998-091 series and Hyosung — with read/write specs, OEM part numbers, and known interchanges.
Anatomy of an ATM card reader head
An ATM card reader is a deceptively simple subsystem: a magnetic head reads (and on some models writes) the three tracks of magnetic stripe data as a card is fed past it, while a feed-roller assembly transports the card. Of the dozens of failure modes a field tech encounters, three quarters trace back to the magnetic head — wear from repeated card passes, contamination from dust and adhesive residue, or end-of-life coil degradation.
The magnetic head itself contains tiny coils (one per track — three for full-coverage readers) wound around ferrite cores. As the cardholder dips and the magnetic stripe passes the head, the changing magnetic field induces a small voltage in the coils; the controller amplifies and decodes that signal back into ASCII track data.
Read-only vs read-write heads — and why it matters
Heads come in two electrical flavours that look identical to the eye:
- LoCo (low-coercivity), read-only. Reads standard 300 oersted magnetic stripes. Cheaper. Used in older deposit-only or balance-only ATMs.
- HiCo (high-coercivity), read & write. Reads and re-writes 2,750 oersted stripes — the standard for modern bank-issued cards. Required for any ATM that updates the magnetic stripe (rare today) or for closed-loop loyalty / transit cards. The right default for any modern install.
Major manufacturers at a glance
The four ATM brands that dominate the global installed base — NCR, Diebold (now Diebold Nixdorf), Wincor (now part of Diebold Nixdorf), and Hyosung — all source their magnetic head assemblies from a small upstream OEM pool. The visible end-product is branded differently, but the head itself is often physically identical.
| NCR | Diebold | Wincor | Hyosung | |
|---|---|---|---|---|
| Common dip-reader assembly | MCRW (998-091 series) | IX series (39-013920-D etc.) | ICM 300 / 330 | Sankyo CRT-572 derivatives |
| Common motorised assembly | DIP/MCRW hybrids | ECRM family | V2X / V2CU / ID18 | MCRF series |
| Coercivity (default) | HiCo | HiCo | HiCo | HiCo |
| Track configuration | 3-track | 3-track | 3-track | 3-track |
| Typical OEM lifespan | 18–36 months | 18–36 months | 18–36 months | 12–24 months |
Part-number cross-reference table
The single biggest time-saver when ordering replacements is knowing which OEM part numbers map onto the same upstream physical assembly. The interchange table below covers the most common dip-reader heads — independently confirmed across ATMParts.net and ATMHeads.com cross-references and decades of field swaps.
| Wincor | NCR | Diebold | Notes | |
|---|---|---|---|---|
| Dip head — standard 3-track | ICM 300 | 998-091-1138 | IX 39-013920-D | Same upstream Sankyo assembly |
| Dip head — Opteva-compat | ICM 330 | 998-091-1147 | Opteva 89-030528000A | Centric / Opteva variant |
| Motorised — V2X / ECRM | V2X HiCo head | (N/A direct) | ECRM equiv. | V2X family fits V2CU in most cases |
| Motorised — V2CU / ID18 | V2CU head | (N/A direct) | (N/A direct) | Smart card + magnetic combo |
Diagnosing a head failure vs other reader faults
Before assuming the head, run these field-proven checks — they take 5 minutes and eliminate the most common false positives:
- 1
Run the operator-mode read test
Every ATM platform (NCR APTRA, Diebold Agilis, Wincor ProBase) has a “card read self-test” in operator mode. Use a known-good test card. If track amplitude on track 2 is < 60% of nominal, the head is suspect. - 2
Try a different physical card
Worn cardholder cards with faded stripes routinely produce false “reader failed” alerts. Grab a brand new card before condemning the head. - 3
Clean the head and feed path
Run a card-reader cleaning card through the slot 3–5 times. Roughly one in three “dead head” tickets resolves at this step. - 4
Inspect the FFC connector and harness
Open the reader, reseat the head's flex cable, and confirm no broken pins. Cracked connectors mimic a dead head and replace much cheaper. - 5
Replace the head only after the four checks above fail
At this point you have isolated the head as the failure. Confirm the part number cross-reference and proceed to the replacement walkthrough below.
Replacement walkthrough
- 1
Power down the ATM and isolate the reader
Take the ATM offline, power off at the main switch, and pull the card-reader module out per the OEM service manual. Read-write heads carry residual voltage — wait 60 seconds before opening.Caution: Always work with a grounded ESD strap; magnetic heads are static-sensitive. - 2
Remove the worn head
Disconnect the FFC cable from the controller PCB. Remove the two retaining screws on the head bracket and lift the head free. Note the orientation — heads are usually keyed but pushing one in backwards damages the alignment shim. - 3
Clean the seat and the feed-roller path
Wipe the head's seat with a swab dipped in 99% isopropyl alcohol. Inspect the feed-roller's rubber surface — if it's glazed or has a visible groove, replace it now (much cheaper than a return visit). - 4
Install the new head and reseat the FFC
Drop the new head into the bracket, ensure the alignment pins seat fully, re-secure both screws to the manufacturer's torque spec (usually 2–3 N·m), and reseat the FFC fully into its ZIF socket. - 5
Re-mount, power on, and re-run the read test
Slide the reader back into the ATM, restore power, and run the operator-mode read self-test on a known-good card. All three tracks should report full amplitude.
What to ask a supplier before buying
The aftermarket for ATM card-reader heads has wide quality variance — from tier-1 manufacturers selling the same upstream assembly under their own brand, to unbranded heads with mismatched coercivity that look identical in product photos. The four-question screen below catches the vast majority of bad listings:
- What is the OEM part-number cross-reference? A good supplier publishes this without being asked. If they can't tell you which Wincor / NCR / Diebold part it replaces, walk away.
- HiCo or LoCo? The default for any modern bank ATM is HiCo. Suppliers who can't immediately answer haven't tested the part.
- What is the resistance (Ω) per track? Quality suppliers test and specify this. It's the diagnostic for counterfeit heads — the real OEM spec is published in service manuals.
- Warranty period and return policy? Reputable aftermarket heads carry 6–12 months. “No returns” or “sold as-is” is a red flag.
Frequently Asked Questions
How do I know if I need a read-only or a read/write head?
Are Wincor V2X and V2CU heads interchangeable?
Why do industry suppliers list NCR, Diebold and Wincor as 'the same head'?
What is the typical lifespan of an ATM card reader head?
Can I install an aftermarket card reader head safely?
Do I need to recalibrate the reader after replacing the head?
Sources & further reading
- Wincor Nixdorf V2CU Card Reader Head — product specifications — atm-machineparts.com
- Diebold, NCR & Wincor Three-Channel Dip Reader Heads — cross reference — ATMParts.net
- Wincor V2X / V2CU / ID18 / HiCo head part numbers — ATMHeads.com
- Magnetic Heads for ATM, Swipe, Dip & Insert Card Reader Systems — MagneticHeads.com
- Wincor HiCo ATM card reader heads for V2X & ID18 — ATMParts.net
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