Hitachi BE-IR30 - Manual (Page 15)

11. Function setting and changes
BE-IR30 / 31 14
When changing the function settings , perform the work with thorough care. Be sure to use
anti-static measures such as a grounding band. Also observe safety precautions when
soldering to avoid burn and fire hazards.
Hitachi Denshi assumes on liability for damage or injury resulting from such work.
Since the function setting can be provided at the time of shipment , consult a Hitachi Denshi
representative.
11-1 AGC on / off
Factory setting is AGC off (fixed gain). If necessary in the application, AGC can be set to on.
When the AGC is off, the gain can be changed by turning RV201.
Set AGC on by changing the indicated chip parts.
Gain R211 R212
fixed gain 0
Ω
Absent Factory setting
AGC Remove 0
Ω
Location of chip resistor (Main board side A)