CD-ES222E (serv.man5) - Sharp Audio Service Manual (repair manual). Page 12

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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.

For obtaining each test mode, press the 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

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 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.

[Self-diagnosis Test Mode]

1.  Button input diagnosis test mode (TEST 6) .…....

TUNNIG UP + VOLUME UP

Processes are different depending on destinations at initial
settings.

One second after display lights up

Press the following buttons in this state to obtain the
operations specified below.

"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.

Press the following buttons in this state to obtain the
operations specified below.
"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

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.

Press the following buttons in this state to obtain the
operations specified below.
"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.