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JMA-9172-SA Instruction Manual > 3.BASIC OPERATION > 3.8  APPLIED OPERATIONS
The brilliance of the target symbol can be adjusted on four stages without opening the 
Brilliance Setting menu.
Adjust the radar display to obtain the best-to-view video.
3.8.6 Adjust Sound Volume (Buzzer Volume)
When an alarm is activated, the operation panel issues an alarm audible to inform 
user of the change of the condition.
The alarm sound can be adjusted by performing the following procedures.
1) Open the Buzzer Volume menu by performing the menu 
operation below.
→ 
→ 5. Buzzer Volume
Display Buzzer Volume menu will appear.
The volume of the alarm sound can be specified for each cause for alarm.
  indicates maximum volume and     indicates minimum volume.
3.8.7 Set User Option Keys [OPTION 1/2]
Users can freely make settings with [OPTION 1] key and [OPTION 2] key.
By using the keys, users can open a frequently used menu by only single 
operation, or assign special functions, to the user key switches.
  : The operation key acknowledgement is set.
  : The incorrect operation alarm is set.
: The dangerous ship alarm is set.
  : The automatic acquisition target alarm is set.
  : The target lost alarm is set.
: The navigation data abnormality alarm is set.
: The system abnormality alarm is set.
: The inter switch switching alarm is set.