Test Mode - Sharp XL-560 Service Manual

TEST MODE

The test mode applied to this microcomputer has three modes, namely ordinary test mode to be used for adjustment or
measurement, aging test mode to be used for aging test, and self-diagnosis test mode for self-inspection in case of final product
inspection.
1. Turning on the test mode
To turn on the specific test mode, press the POWER button, holding down the following two buttons in the ordinary stand-by
mode (power off state). In this case only the main unit button is valid. Even when the POWER of remote control button is set
to on, the test mode is not turned on.
[Ordinary test mode]
1. CD Test Mode (TEST 1).............................. BASS/TREBLE + PLAY
2. Tuner Test Mode (TEST 2)........................... FF/FWD + MEMORY/SET
3. Electronic volume Test Mode (TEST 3)............ STOP + BASS/TREBLE
4. Timer Test Mode (TEST 4)........................... FF/FWD + BAND
5. LCD Test Mode (TEST 5).............................. MEMORY/SET + REW/REV
[Self-diagnosis Test Mode]
1. Button input diagnosis test mode (TEST6)..........
2. CD Test Mode (TEST 1)
In the CD test mode the operation of each step is enabled even when the LID-SW is off. However, if focus cannot be set in step
3 or any error processing is started, it is impossible to proceed to the next step. When the error processing is started, operations
other than termination of test mode by pressing the POWER button or return to the step 1 by pressing the STOP button are inhibited.
1. Step 1 Mode
When the CD test mode is turned on, the following indication lights, the processing (until turning-off of CD STB terminal of CD
initialization operation flow) is executed, and the next button input is waited.
After lighting for one second
If the following operation buttons are pressed in this state, the operation is performed as follows.
"POWER" ................. The test mode is turned off, the power is turned off, and the ordinary standby mode is set.
"FF/FWD" ................. After the pickup returns once to the innermost periphery, it slides toward the outer periphery while this
button is held down.
"REW/REV" .............. After the pickup returns once to the innermost periphery, it slides toward the inner periphery while this
button is pressed. However, if PU-IN is on, input is invalid.
"PLAY" ..................... Shift to step 2
"STOP" ..................... Invalid
"REC PAUSE" .......... 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 PU-IN SW ON cannot be detected within
10 seconds, the slide motor is stopped, and the following error indication appears. Press the POWER button to end the test
mode, or press the STOP button to return to step 1. Any other operations are inhibited.
FF/FWD + REC PAUSE
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XL-560,570/C