Riso Error A16-525 Jun 2026

If the strip is faded, many users have success carefully coloring it with a black permanent marker or covering it with a small piece of black matte paper tape (like gaffer tape) to ensure it absorbs the sensor's light.

If the error occurs on a bare drum, the light absorber strip is the primary culprit.

If the box was empty or emptying it did not clear the code, a physical jam is likely present: Open the master disposal section access cover.

Follow these diagnostic steps in sequence to resolve the issue. Step 1: Perform a Physical Master Clearance

Enter the diagnostic code for your specific Riso model (typically code or 120 on modern series) using the keypad to test the disposal motor function. Press Start to run the test, then press Reset to exit. Hardware Components to Inspect riso error a16-525

在许多RISO机型中，版纸检测传感器通过检测滚筒表面的一个特定“黑色吸光片”来判断是否到达正确位置。当这个吸光片被粉尘、油墨或废纸屑覆盖时，传感器可能无法正确识别，从而误以为滚筒上的版纸还未被清除。如果吸光片本身是受损的国产替代品，也可能引发此问题。

First, physically remove the drum and verify there is no master attached. Check the for jams or broken transfer belts, which can prevent the master from leaving the drum area. 2. The "Sharpie Trick" (For False Errors)

Risograph machines can lock down when an error code is tripped repeatedly. Use this standard sequence to flush the system memory:

Try holding the yellow Reset button while turning the machine on to force a clear of the current state. If the strip is faded, many users have

While the above steps can solve 90% of A16-525 occurrences, sometimes the problem is more serious. You should call a qualified RISO service technician if:

The A16-525 code indicates a breakdown in this sequence. The root causes typically fall into two categories: Physical Master Jams

The causes of this error can be systematically categorized into three primary sources: media-related issues, mechanical wear, and sensor malfunction. The most common and simplest cause is the paper itself. Using paper that is too curled, too damp from humidity, or loaded above the fill line can prevent the feed rollers from establishing proper friction. Additionally, paper that is not perfectly fanned or has static cling can stick together, causing the sensor to see a gap instead of a sheet. The second category involves mechanical degradation. Over thousands of impressions, the rubber feed wheels (pick-up rollers) and the separation pad become smooth and glazed, losing their ability to grip and separate individual sheets. A broken or slipping belt driving the registration roller can also prevent paper from reaching the sensor. The third and most persistent cause is sensor contamination. The paper detection sensors are optical; they emit an infrared beam and measure its reflection. In a Riso duplicator, fine paper dust, ink mist, and spray powder inevitably accumulate on these sensors over time. When sensor 525 is coated with a layer of this residue, it becomes "blind," unable to detect the passing paper even when the mechanical feed is functioning perfectly, thereby triggering a false jam error.

Pull out the master disposal box and empty it. Look inside the slot for any crumpled or partially pulled stencils. Follow these diagnostic steps in sequence to resolve

The soft hum of a RISO digital duplicator is the sound of productivity. But that rhythm can be abruptly shattered by a flashing error message on the control panel. For many users, few sights are as frustrating as the dreaded “” code. It's a common yet vexing issue that can bring high-volume printing to a standstill. However, there's no need to panic. This guide will demystify the error, explain what it means, and provide a clear, step-by-step troubleshooting process to get your RISO back in action.

Troubleshooting Riso Error A16-525: Causes, Fixes, and Prevention

Over time, wet ink or oily residue bleeds onto this black strip. The reflective ink tricks the optical sensor into thinking a light-colored master sheet is still covering it.

If you have tried all the steps above—cleaned the contacts, used a brand new genuine ink cartridge, and reseated the drum—and the A16-525 error persists, the issue is likely a hardware failure.

If the strip is faded, many users have success carefully coloring it with a black permanent marker or covering it with a small piece of black matte paper tape (like gaffer tape) to ensure it absorbs the sensor's light.

If the error occurs on a bare drum, the light absorber strip is the primary culprit.

If the box was empty or emptying it did not clear the code, a physical jam is likely present: Open the master disposal section access cover.

Follow these diagnostic steps in sequence to resolve the issue. Step 1: Perform a Physical Master Clearance

Enter the diagnostic code for your specific Riso model (typically code or 120 on modern series) using the keypad to test the disposal motor function. Press Start to run the test, then press Reset to exit. Hardware Components to Inspect

在许多RISO机型中，版纸检测传感器通过检测滚筒表面的一个特定“黑色吸光片”来判断是否到达正确位置。当这个吸光片被粉尘、油墨或废纸屑覆盖时，传感器可能无法正确识别，从而误以为滚筒上的版纸还未被清除。如果吸光片本身是受损的国产替代品，也可能引发此问题。

First, physically remove the drum and verify there is no master attached. Check the for jams or broken transfer belts, which can prevent the master from leaving the drum area. 2. The "Sharpie Trick" (For False Errors)

Risograph machines can lock down when an error code is tripped repeatedly. Use this standard sequence to flush the system memory:

Try holding the yellow Reset button while turning the machine on to force a clear of the current state.

While the above steps can solve 90% of A16-525 occurrences, sometimes the problem is more serious. You should call a qualified RISO service technician if:

The A16-525 code indicates a breakdown in this sequence. The root causes typically fall into two categories: Physical Master Jams

The causes of this error can be systematically categorized into three primary sources: media-related issues, mechanical wear, and sensor malfunction. The most common and simplest cause is the paper itself. Using paper that is too curled, too damp from humidity, or loaded above the fill line can prevent the feed rollers from establishing proper friction. Additionally, paper that is not perfectly fanned or has static cling can stick together, causing the sensor to see a gap instead of a sheet. The second category involves mechanical degradation. Over thousands of impressions, the rubber feed wheels (pick-up rollers) and the separation pad become smooth and glazed, losing their ability to grip and separate individual sheets. A broken or slipping belt driving the registration roller can also prevent paper from reaching the sensor. The third and most persistent cause is sensor contamination. The paper detection sensors are optical; they emit an infrared beam and measure its reflection. In a Riso duplicator, fine paper dust, ink mist, and spray powder inevitably accumulate on these sensors over time. When sensor 525 is coated with a layer of this residue, it becomes "blind," unable to detect the passing paper even when the mechanical feed is functioning perfectly, thereby triggering a false jam error.

Pull out the master disposal box and empty it. Look inside the slot for any crumpled or partially pulled stencils.

The soft hum of a RISO digital duplicator is the sound of productivity. But that rhythm can be abruptly shattered by a flashing error message on the control panel. For many users, few sights are as frustrating as the dreaded “” code. It's a common yet vexing issue that can bring high-volume printing to a standstill. However, there's no need to panic. This guide will demystify the error, explain what it means, and provide a clear, step-by-step troubleshooting process to get your RISO back in action.

Troubleshooting Riso Error A16-525: Causes, Fixes, and Prevention

Over time, wet ink or oily residue bleeds onto this black strip. The reflective ink tricks the optical sensor into thinking a light-colored master sheet is still covering it.

If you have tried all the steps above—cleaned the contacts, used a brand new genuine ink cartridge, and reseated the drum—and the A16-525 error persists, the issue is likely a hardware failure.