Troubleshooting Guide for the Coin Acceptor

How to calibrate coin acceptor make sure tubes are empty

https://www.youtube.com/watch?v=eY9rSme44HQ

Coin Acceptor Troubleshooting

https://www.youtube.com/shorts/ij2h6b12uPc

How to check coin acceptor for any coins stuck (taiwan brand is in Chinese) follow the video guide

https://www.youtube.com/watch?v=EdBogUGErk8

For a CPI / MEI coin acceptor, the initial testing process is called:

Coin Acceptor Calibration and Validation

This ensures the machine:

• Accepts valid coins correctly

• Rejects invalid coins correctly

• Reads coin values accurately

• Sends the correct credit to the vending machine controller

There are actually TWO important initial procedures:

1. Coin Calibration (Coin Teach / Coin Learning)

This is the process where the acceptor learns and recognizes coin types.

You insert sample coins such as:

• ₱1

• ₱5

• ₱10

• ₱20

The acceptor measures:

• Size

• Weight

• Metal composition

• Electromagnetic signature

This creates a reference profile.

This is called:

• Coin Calibration

• Coin Teach Mode

• Coin Programming

(All refer to the same concept depending on model)

2. Coin Acceptance Testing (Functional Test)

This is what you described — testing if:

• Coin is accepted

• Credit is added correctly

• Coin routes properly

• Change function works (if enabled)

This is called:

• Coin Acceptance Test

• Coin Validation Test

• Functional Test

When the screen shows: "OK 0.00 PHP"

This means:

• Coin acceptor is powered correctly

• Communication is working

• No errors detected

• System is ready for calibration or use

This is a good sign.

STEP 1

Empty all the coins in the coin acceptor

STEP 2

Calibrate the coin acceptor, follow this video guide, https://www.youtube.com/watch?v=yD49WKMXdhE

STEP 3

Once its successful, you can now start putting coins from the top.

Recommended Initial Setup Procedure (standard process)

Step 1 — Power on machine
Step 2 — Check display shows OK
Step 3 — Insert each coin denomination 5–10 times
Step 4 — Verify correct credit appears
Step 5 — Check coin routing to correct tube or cashbox
Step 6 — Verify reject function works
Step 7 — Test change dispensing (if applicable)

Correct preparation before calibration

Do this checklist:

• ✅ Empty all coin tubes

• ✅ Remove coins from escrow / sorter

• ✅ Make sure no coins are stuck

• ✅ Start calibration mode

• ✅ Insert coins one by one slowly

After calibration

You can refill the tubes normally.

Additional Professional Term: Float Setup

This is when you preload coins so machine can give change.

Example:

• ₱10 coins × 20 pcs

• ₱5 coins × 20 pcs

This is called:

Float Loading

Correct Method (Recommended): Load coins DIRECTLY into the coin tubes (inside)

This is the proper and professional way.

You open the machine and load coins directly into the coin tubes of the coin acceptor / coin changer.

Why this is correct:

• Faster

• More accurate

• No unnecessary wear on validator

• Prevents misreads during setup

• Standard procedure used by operators

Incorrect / Not Recommended for initial float: inserting coins from outside repeatedly

This method works, but it is:

• Slow

• Unnecessary wear on acceptor

• Can misroute coins

• Not professional setup method

This method is only used during normal customer operation.

Correct Professional Float Loading Procedure (Step-by-Step)

Step 1 — Open vending machine door

Locate the coin changer unit (CPI / MEI unit)

You will see tubes like:

• Tube A — ₱20

• Tube B — ₱10

• Tube C — ₱5

• Tube D — ₱1

(depending on configuration)

Step 2 — Insert coins directly into tubes from the top

Each tube has an opening.

Insert coins manually.

Example recommended starting float:

• ₱20 × 20 pcs = ₱400

• ₱10 × 30 pcs = ₱300

• ₱5 × 40 pcs = ₱200

• ₱1 × 50 pcs = ₱50

Total float example = ₱950

You can adjust depending on pricing.

Step 3 — Check tube level on display

Your CPI unit screen may show:

• Tube status

• Float value

• Coin level

Or check via vending machine service menu.

Step 4 — Close machine and test change

Insert bill or coin and buy cheaper item.

Confirm machine gives correct change.

Important: Do NOT mix coins in wrong tubes

Each tube is programmed for specific denomination.

Wrong placement = change errors.

When should you insert coins from outside?

Only for:

• Testing coin acceptance

• Normal customer usage

• Calibration testing

Not for bulk float setup.

Professional operator standard practice worldwide:

Always float load directly into tubes manually.

Never load float by inserting coins repeatedly through front acceptor.

When should you insert coins from outside?

Only for:

• Testing coin acceptance

• Normal customer usage

• Calibration testing

Not for bulk float setup.

Professional operator standard practice worldwide:

Always float load directly into tubes manually.

Never load float by inserting coins repeatedly through front acceptor.