E-21 EPSON 爱普生原装板
Applies to: 写真机 / 热升华（爱普生原装板） · Firmware: OEM v4.x
What the customer sees
E-21 reports a paper jam, but nothing is actually jammed.
Most likely causes (ranked)
55% Dirty media sensor
25% Sensor plug loose
20% Mainboard detection circuit failure
4 steps the customer can do
1
Power off and check the sensor window for ink or debris.
2
Gently blow the sensor window with a blower (no needles).
3
Reload the media correctly.
4
Restart and see if the error returns.
3 technician steps
1
Clean or replace the media sensor.
2
Calibrate sensor sensitivity.
3
Check the detection circuit.
3 customer prohibitions
Related parts: 介质传感器
Start step-by-step diagnosis from this code →Contact an online technician (Human-Gate PENDING)← Error Codes
High-risk actions enter the Human-Gate queue and are never auto-executed.