Sharp XL-3700 Service Manual - Page 10

XL-3600 XL-3700/C TEST MODE The test mode applied to this microcomputer has three modes, namely the ordinary test mode for adjustment or measurement, the aging test mode, and the self-diagnosis test mode for self-judgment in case of final product inspection. 1. Turning on the test mode For obtaining each test mode, press the POWER button, while keeping pressing the following two buttons in the ordinary standby mode (power off ). In this case, the main unit buttons are valid. When turning the POWER on with remote control buttons, test modes are not obtained. [Ordinary test mode] 1. CD Test Mode (TEST 1 BASS/TREBLE + STOP 2. Tuner Test Mode (TEST 2 BASS/TREBLE + VOL+ 3. Electronic Volume Test Mode (TEST 3 BASS/TREBLE + VOL- 4. Timer Test Mode (TEST 4 MEMORY/SET + STOP 5. LCD Test Mode (TEST 5 MEMORY/SET + VOL- 6. Electric CD Lid Aging Test Mode (TEST 8)........ MEMORY/SET + VOL+ [Self-diagnosis Test Mode] 1. Button input diagnosis test mode (TEST6)........MEMORY/SET + PLAY Processes are different depending on destinations at initial settings. 2. CD Test Mode (TEST 1) In the CD test mode the operation of each step is possible even if the LID-SW is off. If focus cannot be taken in step 3 or any error is processed, it is impossible to proceed to the next step. During error processing, end the test mode by pressing the POWER button or return to the step 1 by pressing the CD STOP button. Any other operations are inhibited. 1. Step 1 Mode When the CD test mode is obtained, the following display lights up. Then CD initialization operation flow proceeds up to CD STB off to wait for the following buttons to be pressed. One second after display lights up Press the following buttons in this state to obtain the operations specified below. "POWER Test mode and power turned off to shift to the ordinary standby mode. "FF/FWD After the pickup returns to the innermost periphery, it slides toward the outer periphery while this button is pressed. "REW/REV After the pickup returns to the innermost periphery, it slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is invalid. "PLAY Shift to step 2 "STOP Invalid "FUNCTION Shift to step 5 * In case of initialization, the pickup is moved toward the inner periphery. Any buttons other than "POWER" button are not accepted until the shift of pickup to the inner periphery is completed at this time. If PICKUP IN SW ON cannot be detected within 10 seconds, the slide motor stops, and the following error display appears. Press the POWER button to end the test mode, or press the CD STOP button to return to step 1. Any other operations are inhibited. - 10 -