Sony DVS-7200A Maintenance Manual page 134

3-6. Troubleshooting (BKDS-7025/7026)
3-6-4. Test Procedures
10. SUB CPU test
The sub CPU is controled the lighting of the LEDs and is read the switch data and volume control data.
This step is described about only the "SUB CPU test" for the KY-318 through 324 boards.
(1) After starting the self diagnostics mode in the section 3-6-3, input the menu item number "10" on the
"H/W Tester on CPU-263" menu and press [RETURN].
H/W Test = > 10
The terminal screen changes to the following "SUB CPU test" display.
<<<<<<<<<<< SUB CPU Test >>>>>>>>>>>
_ _ _ _ _ Test Menu _ _ _ _ _
1 : SW SCAN Test
2 : LED LIGHTING Test
3 : 7SEG LED Test
4 : FADER & JOY STICK Test
5 : VOLUME KNOB Test
6 : LED BRIGHTNESS Test
Q : Exit
Input Test No ! (1-6) or Q"
(2) Select a menu item from the "SUB CPU test" and execute the test.
(example) Testing "1 : SW SCAN test"
Press "1" on the terminal.
The "1 : SW SCAN test" is automatically performed.
(3) Checking the test result
Check the followings on each test item.
(a) "1 : SW SCAN test"
Press the button on the control panel and check that the pressed button lights.
For the two-color lighting buttons, press the button again and check that the second color lights.
(b) "2 : LED lighting test"
Check that all buttons on the control panel light each block and each board.
(c) "3 : 7-SEG LED test"
Check that all elements for the numeric display 7-segment LED on the control panel light.
(d) "4 : Fader & Joy stick test"
Check that the present value of the fader lever and the joy stick is displayed on the EL display.
(d) "5 : Volume knob test"
Check that the present value of the volume knob is displayed on the EL display.
(f) "6 : LED brightness test"
Check that the brightness and the color of the buttons in each block on the control panel are not vary.
(4) Ending the "Buzzer test"
Press "Q" button on the terminal to return to the "H/W Tester on CPU-263" menu.
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DVS-7200AE MMP1