Aiwa VX-F20DV1 U Service Manual page 84

How to check and set the distinction switch
When the EEP ROM is going to be replaced, be sure to check and change the distinction switch before starting the EEP
ROM replacement as follows.
1. Press the TEST key to enter the aging mode.
2. Press the DISPLAY key to let the DISTINCTION switch appear on screen.
3. Check that "1: US21" is shown in red among 1: US21 to 6: TW25. If "1: US21" is not shown in red, press the numeric ten key
"1" on the keyboard so that "1: US21" is shown in red.
4. Check the data contents of the addresses from 0 to F. Confirm that the data contents of the addresses from 0 to F are identical
what are shown in the illustration. If the contents are different from what are shown in the illustration, select the data that you
want to correct using the CHANNEL UP/DOWN key and change the value (0 or 1) of the selected data using the VOLUME UP/
DOWN key.
5. When data input is complete, press the FINISH key.
6. If you press the FINISH key, the message INITIALIZING appears on the screen. This set enters the standby state in eight
seconds. (When does this operation, channel presetting etc. are initialized.)
If you press the TEST key, without the initialize being done the AGING mode ends.
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