Broadcom
AS-22-Kit-Encoder-AN101
4
AS22 Series
Application Note
Miniature Kit Encoder
Installation Precautions
1. Wear finger cots during installation.
2. DO NOT touch the code wheel pattern as it might cause contamination or scratches to code wheel.
3. DO NOT touch the optical sensor during PCB installation.
4. Be careful during spacer pin removal. Do not let the spacer touch the code wheel as it might scratch the code wheel.
5. Clean the code wheel with delicate task wipers with IPA. Do not use cotton buds (non lint free) as it will cause scratches
to the codewheel.
Troubleshooting Guide
For more information about the product specifications, refer to the product data sheet,
AS22 Series Miniature Kit Encoder
Data Sheet
, AS-22-Kit-Encoder-DS100.
ID
Issue
Cause
Countermeasure
1
Double/multiple index,encoder
performance exceeds data sheet
specs limit
Contamination on code wheel
Clean code wheel with delicate task wipers
with IPA.
Base plate mounting exceeds recommended
tolerance
Realign base plate using alignment sleeve.
Code wheel gap not within recommended
tolerance
Realign code wheel gap using spacer pin.
Shaft TIR exceeds recommended tolerance Reduce shaft TIR to within recommended
tolerance.
2
Encoder current consumption out
of spec
Detector IC faulty/shorted
Consult factory.
3
No signal output
Encoder power supply too low
Check if Vcc versus ground is within 4.5V ~
5.5.
Poor connectivity between encoder output
pin and connector
Check pin and connector connectivity.
Wrong power supply polarity connection
Check connector wire connection for Vcc
and ground is per the Pin Configuration table
in the data sheet.
Detector IC faulty
Consult factory.