| 摘要 |
PURPOSE:To prevent the abnormality of an electronic equipment caused by bus fight by detecting the abnormality of a newly inserted and connected printed board unit with an abnormality detecting means provided on an existing printed board unit. CONSTITUTION:When a newly inserted and connected printed board unit 2 is defective, an abnormality detecting means 6a provided on the existing printed board unit 6 detects this state and informs a main control circuit 3 of an abnormality report signal S7. The main control circuit 3 does not send a test mode releasing signal S2 to a test mode set releasing means 2b to keep the printed board unit 2 in the test mode and suppresses the data output to prevent the bus fight of data. Thus, the abnormality of the electronic equipment is prevented. |
