Sharp CD-E500 Service Manual - Page 11

TEST MODE CD-E500 CD-E55/E44 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 selfjudgment in case of final product inspection. 1. Turning on the test mode For obtaining each test mode, press the POWER ON/ STAND BY button, while keeping pressing the following two buttons in the ordinary stand-by 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 CD + VOLUME UP 2. Tuner Test Mode (TEST 2 TUNER(BAND) + VOLUME UP 3. Electronic Volume Test Mode (TEST 3 TUNING DOWN + VOLUME UP 4. Timer Test Mode (TEST 4 TIMER/SLEEP + VOLUME DOWN 5. FL Test Mode (TEST 5 CLOCK + VOLUME DOWN 6. CD MECHANISM Aging Test Mode (TEST 8) ........ MEMORY/SET + VOLUME DOWN Press the following buttons in this state to obtain the operations specified below. "POWER ON/STAND BY" .. 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. "MEMORY/SET" ...... Shift to step 2 "STOP Invalid "VIDEO/AUX CLV 2. Step 2 Mode Press the "MEMORY/SET" button in this mode to transmit the laser lighting command LDON (8400) and turn on the laser. Any other operations are not performed in this case. [Self-diagnosis Test Mode] 1. Button input diagnosis test mode (TEST06) ........ TUNNIG UP + VOLUME UP 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 ON/STAND BY 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. Press the following buttons in this state to obtain the operations specified below. "POWER ON/STAND BY" . Test mode and power turned off to shift to the ordinary standby mode. "FF/FWD The pickup slides toward the outer periphery while this button is pressed. "REW/REV The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is invalid. "MEMORY/SET"...... Shift to step 3 3. Step 3 Mode While the laser keeps lighting, CD initialization operation flow proceeds up to 'CLV servo ON' to wait for the following buttons to be pressed.(Focus servo turned on for focus search) The focus search is repeated to take focus. One second after display lights up Press the following buttons in this state to obtain the operations specified below. "POWER ON/STAND BY" . Test mode and power turned off to shift to the ordinary standby mode. "FF/FWD The pickup slides toward the outer periphery while this button is pressed. "REW/REV The pickup slides toward the inner periphery while this button is pressed. If PICKUP IN is on, input is invalid. "MEMORY/SET"...... If focus has been taken, shift to step 4 is executed. If not, acceptance is inhibited. *If the focus is not received after it has been taken, the process returns to step 1. - 11 -