Test Mode - Sharp XL-520W Service Manual

TEST MODE

The Test Mode for this microcomputer has two variations, namely "regular Test Mode" for adjustment and measurement and "self-
diagnosis Test Mode" for self-judgment in final inspection of products.
1. Entering the Test Mode
To enter the each Test Mode, press the POWER key, holding down the following two keys in the regular standby mode (power
off state). In this case only the main unit keys are valid. The Test Mode is not set even when the remote controller POWER
key is turned on.
[Regular Test Mode]
1. CD Test Mode (TEST 1).............................. Stop + Play
2. Tuner Test Mode (TEST 3)........................... Memory/Set + Band Selector
3. Electronic volume Test Mode (TEST 4)............ Stop + Extra Bass/Equalizer Mode
4. Timer Test Mode (TEST 5)........................... Fast Forward + Function Selector
5. LCD Test Mode (TEST 6).............................. Memory/Set + Function Selector
[Self-diagnosis Test Mode]
1. Key input diagnosis TEST Mode (TESTA).........Play + Record Pause
2. CD Test Mode (TEST 1)
1. Step 1 Mode
When the CD Test Mode is set, the following display lights, and the CD pickup slides to the innermost periphery.
After lighting for 1.5 sec
When the following operation key is pressed in this state, the following operation is performed.
"POWER" ................ The Test Mode is set to off, power is turned off, and the mode is changed to the regular standby mode.
"FF/FWD" ................ After the pickup returns once to the innermost periphery, the pickup slides to the external periphery while
................................. this key is held down.
"REW/REV" ............. After the pickup returns once to the innermost periphery, the pickup slides to the internal periphery while
................................. this key is held down. However, input is invalid if PU-IN is on.
"PLAY" ..................... Shift to Step 2
"STOP" .................... Invalid
* In case of mode entry the pickup is moved to the internal periphery. At this time entry of any key other than POWER key is
disabled until shift of pickup to the internal periphery is completed. If PU-IN SW ON cannot be detected while waiting for 10
seconds, the slide motor is stopped, the following error is displayed, and entry of any key other than POWER key is disabled.
2. Step 2 Mode
When the PLAY key is pressed in the mode above, the laser lighting is turned on. In this state the laser is only turned on,
and other operations are not performed.
[Holding Down Keys]
– 11 –
XL-520W/CP-520