1-2. IR Control Test
This function is used to check IR control operations.
Since this mode is only for production/development, the detailed information is not provided.
1-3. Protection History Display Mode
If protections have been activated multiple times, the latest protection operation is recorded.
1-3.1. Starting up
Insert the AC plug while pressing "
POWER
" button, and wait for more than 3 seconds.
Select the "
Protection History
" using the "
CURSOR
f
/
d
" button, then press the "
ENTER
" button to
confirm.
1-3.2. Displays
Startup display
"
Protection History
" is displayed for 5 seconds.
To exit this mode, unplug the power cord.
• Display when there is no history of protection being activated
• AMP abnormality detection dis-play
ASO protect
Speaker short-circuit (recoverable)
High volume at low impedance (recoverable)
Output stage transistor destroyed (permanent damage )
Thermal protect
Abnormal temperature in output stage transistor (recoverable)
Speaker DC protect
When a low frequency signal of 4Hz or less is input (recoverable)
Output stage transistor destroyed (permanent damage)
• Display for detection of short circuits in analog and DDFA-related power supplies
Cause : Completely destroyed circuit assumed
(Detection voltage: +15V, ± 15V midpoint, +12V, +16V_OLED, +5V_LEGO, +3.3VD, +5V_DAC)
• Display for detection of short circuits in digital power supplies
Cause : Completely destroyed circuit assumed
(Detection voltage: ± B Power supply midpoint detection)
• Main trans abnormality detection dis-play
Cause : Main trans malfunction (permanent damage)
Resetting the protection history
With the protection history displayed, press and hold the "
CURSOR
d
" button for over 5 seconds to
clear the protection history.
After the history is cleared, "
No Protection
" is displayed.
Protection history is cleared, even when the set is reset (Factory Reset).
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
50
