| 摘要 |
PURPOSE:To inspect whether DL relay has been selected properly by driving a DL selecting circuit in a short time before DL drive and by discriminating whether it has operated normally. CONSTITUTION:Before operating or resetting DL as a load, drivers RELRT and RELDL are operated in a short time and during this time, the 1/N operation of a DL driving and selecting circuit for a DL driving line is inspected. Namely, one of lead-in inspection lines l0-ln to an inspecting circuit is held at the potential of ground G through the operation of drivers RELRT and RELDL and one of bilateral thyristors TR0-TRn which is selected with a DL drive selective signal, thereby operating the 1/N inspecting circuit. |
