YOKOGAWA TA220 User Manual page 151

12.4 Self Diagnostics (Self Test)
Explanation
12-8
If a problem is discovered during the diagnostic test (self test), contact the dealer from
which you purchased the instrument for repairs.
Signal Cables
When performing the self test, remove all cables connected to the instrument (both input
and output) other than the power cable and communication cable. Also, the self test
cannot be performed if the TA220 is in remote mode. Switch from remote mode to local
mode.
Display and Indicator Test
You can test all indicators on the instrument including the 7-segment LED and decimal
point of Display 1, and the dot pattern of Display 2. However, the indicators for the
measurement input terminal (RF input) cannot be tested. Turn the rotary knob and
confirm that the lit position of the indicator moves accordingly. If all displays and
indicators (excluding the measurement input terminal indicator) illuminate in order, they
are functioning normally.
Key and Rotary Knob Test
When you press a key or turn the rotary knob, the corresponding characters are
displayed in Display 2. If the words/characters indicated in the table below are
displayed, the key or rotary knob is operating normally.
Key/Rotary Knob
MEDIA
FUNCTION
ARMING
INHIBIT
SHIFT
LOCAL
RECALL
ENTER
POLARITY
TRIG
IMPEDANCE
EQUALIZER
<
>
MEASURE
SCALE
Rotary knob turned right
Rotary knob turned left
Meter Test
If the values displayed in Display 1 increase or decrease, and the needle moves to the
left or right as you turn the rotary knob to the left or right, the meters are functioning
normally.
Board Test
You can test the CPU board, measure board, input board, equalizer board, and Ethernet
board. If PASS is displayed, the board is operating normally. If a problem is detected, a
hexadecimal value indicating the problem can be displayed separately for each board.
When contacting your nearest YOKOGAWA dealer for repairs, please give them that
hexadecimal number.
Words/Characters Displayed in Display 2
Media
Function
Arming
Inhibit
Shift
Local
Recall
Enter
Polarity
Trig
Impedanc
Equalize
Left
Right
Measure
Scale
JogRight
JogLeft
IM 704610-01E