Repair of money adding machines: from diagnostics to replacement of parts

Money adding machines are an indispensable tool for business, but even the most reliable models fail over time. Problems can range from simple clogging of sensors to serious breakdowns of mechanical components. In this article, we will look at how to independently diagnose and repair faults without resorting to expensive service.

Many owners are afraid to repair adding machines, considering them too complicated. In fact, 80% of breakdowns are associated with contamination or wear of consumables - you can fix them yourself. The main thing is to correctly determine the cause and follow proven algorithms.

We will look in detail at:

• 🔍 How to carry out initial diagnostics without special tools
• 🔧 Typical breakdowns and ways to fix them (with photos and diagrams)
• 💰 When DIY repairs are impractical and it’s better to contact a service
• 🛠️ Necessary tools and consumables for DIY repairs

1. Signs of a malfunctioning adding machine

The first step is to correctly identify the problem. Most adding machines (Cassida 5520, Kolibri K-1000, Magner 150) indicate faults in the same way, regardless of the model.

Main symptoms:

• 🚨 Car won't turn on or turns off immediately after start
• 📉 Incorrect count bills (over/understated)
• 🔄 Chewing banknotes or their incorrect presentation
• 🔊 Extraneous sounds (creaking, knocking, vibration)
• 📛 Errors on the display (codes E01, E03, E05)

If the machine won't turn on, check the power supply and network cable first. In 60% of cases, the problem lies in oxidized contacts or a blown fuse. For models with battery (Glory GF-1000) the cause may be a deep discharge of the battery.

Incorrect count usually associated with dirty optical sensors or worn feed rollers. In this case, cleaning and replacing consumables will help. But chewing banknotes most often indicates problems with the transport mechanism - this may require adjustment or replacement of the belts.

2. Diagnosis of faults: step-by-step instructions

Before disassembling the machine, perform basic diagnostics. This will help narrow down possible problems and avoid unnecessary actions.

Step 1. External inspection

• 🔌 Check the integrity of the network cable and plug
• 🔋 Make sure the power light is on (if present)
• 🧹 Inspect the output tray for foreign objects

Step 2. Test run

• 📄 Try passing 10-20 bills through the machine different denominations
• 🎵 Listen to the sounds of the mechanism
• 📊 Compare the calculation result with the real amount

Step 3. Error Analysis

If error codes appear on the display, decipher them according to the instructions for your model. For example:

• E01 — problem with the bill sensor (most often pollution)
• E03 - feed motor malfunction
• E05 — calibration error (factory reset required)

Critical information: If the machine produces an error E07 (for models Magner and Kolibri), this indicates a faulty motherboard. In this case, independent repair is impossible - the board must be replaced at a service center.

3. Common breakdowns and ways to fix them

Let's look at typical faults and what to do about them. Most problems can be fixed without special skills.

1. Contamination of optical sensors

Symptoms: machine does not recognize banknotes or considers them incorrectly.

Solution:

• 🧴 Wipe the sensors alcohol solution (at least 70%)
• 🪥 Use cotton swabs for hard to reach places
• 🚫 Do not use abrasive materials!

2. Wear of feed rollers

Symptoms: bills are chewed or served several pieces at once.

Solution:

• 🔧 Replace the rollers with new ones (kits are sold for most models)
• 📏 Adjust the gap between the rollers according to the instructions

3. Broken transport belt

Symptoms: banknotes don't go through through the mechanism or get stuck.

Solution:

• 🔄 Remove the case cover and inspect the belt for cracks
• 🛠️ Replace the belt (for Cassida 6600 fit belt RB-6600)

4. Engine malfunction

Symptoms: the machine won't turn on or publishes uncharacteristic hum.

Solution:

• 🔌 Check the voltage at the motor terminals with a multimeter
• 🔄 If the motor does not rotate, replacement is required

⚠️ Attention: When replacing the motor, be sure to disconnect the machine from the network and discharge the capacitors (if they are in the circuit). In models Glory and De La Rue capacitors can retain charge for up to 5 minutes after being disconnected!

4. Disassembling the adding machine: step-by-step process

If superficial cleaning does not help, you will have to disassemble the device. Important! Before disassembling, take photographs of the location of all parts and wires - this will help with reassembly.

Required tool:

• ⚒️ Set of screwdrivers (phillips, flat, Torx T8-T10)
• 🔧 Tweezers for small parts
• 🧲 Magnetic backing for screws
• 📸 Smartphone for photographing the process

Disassembly order (for example Kolibri K-2000):

1. Unplug the machine and remove the bill tray.
2. Remove the 4 screws on the bottom cover (usually under the rubber feet).
3. Carefully remove the top cover, starting from the back.
4. Disconnect the sensor cables (remember their location!).
5. Remove the transport mechanism to access the rollers and belt.