Shimadzu MUX-100D, Service Manual

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６ ADJUSTMENT/REPLACEMENT OF EACH PART
ＭＵＸ-１００ SERVICE MANUAL ６ - １９
６-４ Adjustment of Tube Current
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Adjust the tube current by changing the preset value of the filament current (hereafter referred to as “FVR value”).
Usually, adjust the tube current in the tube current 2-point adjustment mode. If adjustment of higher precision is
required, adjust the tube current in the tube current each point adjustment mode.
NOTE After changing the FVR value, if you turn off the power or change position or change mode
without pressing the program registration key, the FVR value is not stored. Registration is
enabled even while the scan condition is displayed (that is, while the FVR value is not displayed.)
６-４-１ FVR adjustment in tube current 2-point adjustment mode
Ⅰ Setting of tube current 2-point adjustment mode
Set to ON the DIP switch SW2-5 ( Measured value display mode ) SW3-8 ( Adjustment mode ) on the NEXSC
PCB, and turn on the power.
Press the head scan key in the APR to enter the tube current 2-point adjustment mode. (The LEDs on the head
scan key and the standard body key flicker.)
Ⅱ Setting of tube voltage
(Because the tube voltage is fixed to 80 kV, you do not have to set it.)
Ⅲ
Setting of tube current
Only two positions, 50 and 160 mA, can be set. Set each position, then perform the steps IV and VI.
Ⅳ Exposure
Press the hand switch to perform exposure. When the measured tube current is displayed in the tube current
display unit, compare it with the preset value.
Ⅴ Adjustment of FVR value
Press the remote control selection key to display the FVR value in the preset tube voltage display unit. To
change the FVR value, press the tube voltage setting keys. If the measured tube current is higher than the preset
value, make the FVR value smaller. If the measured tube current is lower than the preset value, make the FVR
value larger. Repeat the steps IV and VI until the measured value becomes proper ( 50 mA : 45 - 48mA
160mA : 148 – 155 mA ).
Ⅵ Registration of FVR value
Press the program registration key to register the FVR value in each position. When this key is pressed, “record”
is displayed in the display unit and the FVR value is stored.