عطل مزوّد الطاقة في نقاط البيع والصرّاف الآلي: التشخيص والاختبار بالملتيميتر والاستبدال المطابق للمواصفات
دليل عملي لتشخيص مزوّد طاقة POS/ATM ميّت أو غير مستقر — قراءة الأعراض، قياس جهد الخرج والتمويج بالملتيميتر، رصد المكثفات التالفة، واختيار بديل آمن حسب الجهد والتيار والقطبية والموصّل.
الفرز السريع
When a POS terminal or ATM goes dark, the power supply is the first suspect — not the motherboard. Power supplies are wear parts that run hot for years; boards rarely fail outright. Before you condemn anything expensive, run this fast triage:
| Step | What it rules out | |
|---|---|---|
| 1. Test the outlet | A dead socket or tripped breaker mimics a dead supply | — |
| 2. Inspect the brick & cable | Status LED off, frayed cable or bent connector pins | — |
| 3. Measure the output voltage | Confirms the supply delivers within ±5% of its rating | — |
| 4. Substitute a known-good supply | If the terminal boots, the supply was the fault — done | — |
| 5. Only then suspect the board | Proven-good power is the prerequisite for board diagnosis | — |
قراءة الأعراض
The failure pattern tells you a lot before you pick up a meter. A supply rarely dies cleanly — it usually degrades, and the symptom points to the cause:
| Symptom | Most likely cause | |
|---|---|---|
| Completely dead, no lights | Failed supply, blown fuse, or dead outlet/cable | — |
| Random reboots under load | Aging filter capacitors sagging when current spikes | — |
| Powers on, then shuts off | Over-current/over-temp protection tripping | — |
| Fan spins but no boot | One output rail down, or board not getting standby power | — |
| Burning smell / buzzing | Failing transformer or capacitor — power off immediately | — |
| Swollen / leaking capacitor | Definitive supply (or board power-section) failure | — |
تأكيده بالملتيميتر
A multimeter turns guesswork into a yes/no answer in under five minutes. Work through these steps; the goal is to prove the supply good or bad before touching the board.
- 1
Verify input power
Confirm the wall outlet works with another device and the cable is fully seated. Check for an inline fuse or a reset switch on the supply. Rule out the obvious before you measure. - 2
Inspect for physical failure
Look (and smell) for bulging or leaking capacitors, scorch marks, a melted connector or a burning odour. Any of these is a confirmed fault — stop and replace.Caution: Never open a sealed external adapter that's still plugged in. Unplug and let it sit before any internal inspection. - 3
Measure DC output voltage
Set the meter to DC volts and probe the output (centre pin to barrel, or the labelled + / − pins). It should read within ~±5% of the rating — a 12V supply should show roughly 11.4–12.6V. Far off, drifting or zero = failed. - 4
Check ripple on AC volts
For terminals that reboot or glitch, switch the meter to AC volts on the same DC output. More than about 100mV of AC ripple indicates failing filter capacitors even when the DC reading looks healthy. - 5
Substitute a known-good supply
The decisive test: connect a spare supply of identical voltage, polarity and connector. If the terminal boots and runs stably, the original supply was the fault. If it still won’t boot, now suspect the board.
داخل مزوّد التبديل: لماذا تتلف المكثفات
Most modern POS and ATM supplies are switching supplies: they rectify mains AC to high-voltage DC, chop it at high frequency through a transformer, then rectify and smooth it back to clean low-voltage DC. The components that smooth that output — the electrolytic filter capacitors — are the most common point of failure.
Capacitors are rated for a finite number of hours at temperature. In a POS terminal running 12–16 hours a day for years — often in a warm, dusty under-counter space — they dry out, lose capacitance and stop smoothing the output. That’s why a supply can pass a quick voltage check yet still cause reboots: the DC average is fine, but the ripple riding on it has grown beyond what the board tolerates.
اختيار بديل آمن
Choosing a replacement is where terminals get accidentally destroyed. Four specs must line up. Three are non-negotiable; only amperage has any headroom:
| Spec | Rule | |
|---|---|---|
| Voltage | Must match exactly (12V stays 12V). Wrong voltage damages the device. | — |
| Polarity | Centre-positive vs centre-negative must match. Reversed polarity is instant damage. | — |
| Connector / barrel | Same plug type and barrel size, or it won't fit (or fits loosely and arcs). | — |
| Amperage (current) | Equal or HIGHER is safe. The device draws only what it needs. | — |
| Regulation | Match regulated with regulated; an unregulated swap can over-volt at low load. | — |
توفير مزوّد الطاقة المناسب
POS and ATM hardware uses a wide range of supplies — external bricks for terminals and peripherals, internal switching units for all-in-one terminals, and high-current supplies for ATMs. Match yours to the original by reading the label, or send us the model and we’ll cross-reference it:
| Supply type | Typical use | |
|---|---|---|
| External adapter (brick) | Terminals, displays, card readers, peripherals | — |
| Internal switching PSU | All-in-one POS terminals, larger receipt printers | — |
| Printer power supply | Thermal/impact receipt printers (often 24V) | — |
| ATM power supply | Cash dispensers, deposit modules — high current | — |
| DC-DC converter | On-board rail conversion inside terminals | — |
Browse spec-matched units in our power supplies category, or related boards and modules in POS terminal repair parts. If a proven-good supply still won’t boot the terminal, the fault is upstream on the board — our terminal & model identification guide helps you find the exact machine type so we can match the right mainboard or FRU. Send us the label photo and we’ll confirm the correct power supply before you order.
الأسئلة الشائعة
جهاز POS لدي ميّت تمامًا — أهو مزوّد الطاقة أم اللوحة الأم؟
كيف أختبر مزوّد الطاقة بالملتيميتر؟
هل أستخدم محوّلًا بتيار أعلى كبديل؟
ماذا يعني المكثف المنتفخ أو المتسرّب؟
لماذا يُعيد جهازي التشغيل أو ينطفئ عشوائيًا تحت الحمل؟
هل يُجدي إصلاح مزوّد الطاقة أم استبداله؟
المصادر والمراجع الإضافية
- POS Terminal Turn-On Troubleshooting — Volcora Help Center
- Switching Power Supply Troubleshooting & Repair Guide — ATO
- Power Supply Troubleshooting and Testing — Control.com
- Basics of Troubleshooting Power Supplies — Test & Measurement Tips
- Troubleshooting Point-of-Sale PCB Failures — ALLPCB
أدلة ذات صلة
انحشار القاطع التلقائي في طابعة إيصالات POS: كيفية إزالة الانحشار وإعادة الضبط واستبدال وحدة القطع (Epson وStar وBixolon)
القاطع المنحشر يوقف نقطة البيع كاملةً، لا الطابعة فقط. إليك التسلسل الدقيق لإزالته بأمان في أقل من دقيقتين — وكيف تميّز بين شفرة بالية وأخرى منحشرة فقط.
اقرأ الدليل →درج النقود لا يفتح؟ الدليل الكامل لتشخيص الأعطال والتوصيل والجهد (RJ11/RJ12)
في تسع حالات من أصل عشر، يكون الدرج المعطّل خطأ طابعة أو كابلًا مفكوكًا أو عدم توافق جهد — لا درجًا تالفًا. إليك مسار التشخيص الكامل، وتوزيع أطراف منفذ DK بدقة، وكيف تتجنب إحراق الملف اللولبي.
اقرأ الدليل →شاشة POS اللمسية لا تستجيب؟ التشخيص وإعادة المعايرة والاستبدال (مقاومية مقابل سعوية مقابل PCAP)
الشاشة التي لا تستجيب أو تنحرف عن الهدف أو تسجّل لمسات وهمية غالبًا تبعد عن العمل بمسافة تنظيف أو كابل أو معايرة — لا جهازًا جديدًا. إليك التسلسل، وكيف تعرف أن المُرقمِن (digitizer) ميّت فعلًا.
اقرأ الدليل →فئات ذات صلة
قطع غيار مميزة
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هل تحتاج إلى القطع المذكورة في هذا الدليل؟
قطع OEM أصلية وبدائل مختبرة في المصنع لأنظمة IBM و Toshiba و NCR و Diebold و Wincor و Hyosung — مع شحن عالمي.
