Aiwa TV-CN143 Service Manual page 19

3. Display of "CRT ON" accumulated hours
The CRT usage time is accumulated on an hourly basis and is
indicated in hexadecimal figures.
Sample calculation of displayed hexadecimal figures : AFT OK 1234 H MONO
* The display will be reset to 0000H when the accumulated hours exceed
7FFFH (32768 hours)
Adjustment Mode Operation Method:
1. Return to the aging display by pressing the "SYSTEM" key and press
"TEST" key once again to enter into the adjustment menu screen.
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