| 摘要 |
<p>PURPOSE:To decrease number of components by inputting selectively a command signal outputted from an operating section to the 1st or 2nd logic control circuit. CONSTITUTION:In loading a cassette tape to processing sections 1a, 1b with a changeover switch 6 turned off, only the processing section 1a is brought into the operationable state with priority. When the changeover switch 6 is turned on in this case to connect a base of a transistor (TR) Q1 to ground and turn off the TR Q1, then a cassette loading detection terminal A1 of a logic control circuit 3a goes to an L level and an enable terminal B1 goes to an H level. Further, a TR Q2 is turned on, a cassette loading detection terminal A2 of a logic control circuit 3b is at an L level and a key enable terminal B2 goes to an L level, the command signal from the operating section 4 is made effective only to the logic control circuit 3b. The processing sections 1a, 1b are operated selectively by the operating section 4 with the operation from an operation switch circuit 5.</p> |
