¿El lector de tarjetas del cajero no lee? Dip vs motorizado vs sin contacto, atascos, contactos del chip y tarjetas retenidas
Una guía para operadores de un lector de tarjetas de cajero que no lee o retiene tarjetas — los tipos dip, motorizado y sin contacto, limpiar el cabezal y los contactos del chip, despejar atascos del obturador, leer el código de error, y manejar una tarjeta capturada.
El triaje rápido
An ATM card reader that won’t read — or worse, swallows cards — rarely has a dead reader. The usual causes are a dirty magnetic head, fouled chip (ICC) contacts, or a mechanical jam. The fault code and the symptom tell you which, and most fixes are cleaning and clearing. Triage in this order:
| Do this | What it rules out | |
|---|---|---|
| 1. Clean the reader; test a known-good card | Dirty head + worn customer card — the top two causes | — |
| 2. Read the fault code | Separates a stripe fault from an ICC (chip) fault from a jam | — |
| 3. Clear any jam in the card path | A stuck card or debris stops reads | — |
| 4. Clean the chip (ICC) contacts | Stripe-reads-but-chip-fails is the ICC contacts | — |
| 5. Cross-test / escalate | Confirms reader vs card; flags tamper for security | — |
Lectores dip, motorizado y sin contacto
Which reader type your ATM uses changes both the symptoms and the fix — especially whether it can physically retain a card:
| Dip | Motorized | Contactless | |
|---|---|---|---|
| How it reads | Insert & withdraw; card never stays in | Pulls card in, holds, then ejects | Tap (NFC); card never inserted |
| Can retain a card? | No | Yes | No |
| Magnetic head | Yes | Yes | No |
| Chip (ICC) contacts | Usually | Usually | No (uses NFC) |
| Typical faults | Dirty head, ICC contacts | Jams, capture, sensors | Antenna / NFC module |
Leer el síntoma
Match the symptom to point at the cause before you open anything:
| Symptom | Most likely cause | |
|---|---|---|
| No card reads at all | Dirty/failed magnetic head, or a reader/comms fault | — |
| Some cards read, others don't | Worn/demagnetized customer cards — not the reader | — |
| Stripe reads, chip fails | Dirty, worn or misaligned ICC contacts | — |
| Card jams / won't go in | Debris or foreign object in the card path | — |
| Retains cards (motorized) | Jam, timeout, capture flag, or a failing sensor | — |
| Contactless won't tap | NFC antenna/module fault or config | — |
Paso a paso: despejar las causas comunes
Work the sequence in order, within your machine’s documented procedure and security rules. Stop and escalate if the fault is beyond routine clearing.
- 1
Clean the head and test
Run a cleaning card through the reader to clear the magnetic head, then test with a known-good card. This resolves the most common read failures. - 2
Read the fault code
Check the operator menu — a magnetic-stripe error, an ICC (chip) error and a jam each point at a different fix. - 3
Clear any jam
Power down the reader per procedure, gently remove a stuck card or debris from the throat/transport without forcing it, and inspect the card path.Caution: If a foreign object looks intentionally placed, treat it as possible skimming — escalate, don't just remove it. - 4
Clean the chip contacts
If the stripe reads but the chip fails, clean the ICC contact area per your machine’s method and re-test a known-good chip card. - 5
Cross-test, then power-cycle or escalate
Confirm reader vs card with known-good cards, power-cycle, and re-test. If the code points at the head, controller or motor — or cards are still retained — call authorized service.
Manejar una tarjeta retenida (capturada)
Card retention is unique to motorized readers and is a cash-/security-adjacent event, so it has its own handling rules beyond “fix the reader”:
| Situation | What to do | |
|---|---|---|
| Card retained at end of transaction | Reconcile to the capture bin; log it per procedure | — |
| Returning a captured card | Verify the cardholder per your operator's secure process — never hand back unverified | — |
| Frequent retention | Suspect a jam, dirty/failing sensor, or misfeed — service the reader | — |
| Capture bin full | Empty and reconcile per procedure; a full bin can halt the reader | — |
Piezas de desgaste y cuándo llamar al servicio
When cleaning and clearing don’t fix it, these are the parts that wear or fail in an ATM card reader — fitted by authorized service, matched to your machine:
| Part | Symptom when failing | |
|---|---|---|
| Magnetic read head | Stripe won't read after cleaning (see heads guide) | — |
| ICC (chip) contact block | Chip fails while stripe reads | — |
| Shutter / gate | Card won't enter, or jams at the throat | — |
| Transport rollers / motor (motorized) | Misfeeds, retention, intermittent transport | — |
| Sensors | False jams/retention, mis-detected card position | — |
| Contactless (NFC) module | Taps not detected on a contactless reader | — |
Browse readers and related parts in our card readers & scanners and terminal repair parts categories. For the read-head deep-dive see our ATM card reader heads guide; for the POS hand-swipe MSR (a different device) see the POS card reader guide; and for other ATM peripherals, the cash dispenser and PIN pad (EPP) guides. Tell us your ATM and reader type and we’ll match the right part.
Preguntas frecuentes
Mi cajero no lee tarjetas — ¿por dónde empiezo?
¿Qué diferencia hay entre un lector dip, motorizado y sin contacto?
El lector lee la banda pero no el chip — ¿por qué?
¿Por qué mi cajero retiene (se traga) las tarjetas de los clientes?
¿Cómo despejo un atasco de tarjeta en el lector con seguridad?
¿Cuándo debo parar y llamar al servicio autorizado?
Fuentes y lecturas complementarias
- Common ATM Error Codes and How to Fix Them — ATM Depot
- Troubleshooting Common ATM Errors: Repair vs Replace — Dollar ATM Club
- Nautilus Hyosung ATM Support (card reader) — Nautilus Hyosung
- Card Reader Technologies: Dip, Motorized, Contactless — ID TECH
- ATM & Kiosk Card Reader Maintenance — Kiosk Industry
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