QT-CD161H (serv.man2) - Sharp Audio User Guide / Operation Manual. Page 8

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The types of test mode for this microcomputer and specific test mode turning-on procedure are as follows. Only the unit key is used.
The remote control key is not valid. The power must be turned on while two keys are held down.
(1) CD test mode function

The power is turned while the (PRESET 

 ) and STOP (TUNING 

 ) keys are held down.

(2) Tuner test mode function

The power is turned on while the (PRESET 

 ) and PAUSE (BAND) keys are held down.

(3) LCD test mode function

The power is turned on while the (PRESET 

 ) and MEMORY keys are held down.

When the CD test mode is turned on, the CD pickup is moved to the innermost periphery, and the following indication appears.
The operation of CD test mode is as follows.

Indication

(1) The CD pickup is moved with the unit UP key and DOWN key.

UP key: The pickup is slid to the outer periphery.
DOWN key: The pickup is slid to the inner periphery. However, when it reaches the innermost periphery, it does not move further
inward.

(2) When the PLAY key is pressed in stop state, "the laser diode turns on if CD lid is closed" .

Indication

(3) When the PLAY key is pressed in laser ON state, playback is started from the current position of pickup.

Indication

(4) When the STOP key is pressed during playback, the laser goes out and playback is stopped, and the process returns to step

(1). (The pickup position does not change.)

(5) When the MEMORY key is pressed during playback, tracking servo ON/OFF is performed. (Even if the playback is stopped

in servo OFF state, the servo is turned on when the playback is restored.)

Indication

The current pickup position and time are indicated. (When the
pickup is moved with the UP/DOWN key, the time at that point
is indicated.)

The current playback track No. and time are indicated.

The tuner test mode is intended to store the measurement frequency for adjustment and inspection in the preset memory CH
without frequency adjustment in the case of tuner adjustment in the production line.
When the power is turned on while the PRESET 

 (DOWN) key and BAND (PAUSE) key are held down together, the frequency

for adjustment measurement of destination (specified according to AREA terminal) is preset-stored in the preset memory CH. (The
frequency to be preset-stored for specific destination is as shown in the next page.)

Others

While the CD lid is open (LID-SW = "H"), the test mode is turned on but the operations of step (2) and subsequent steps are not
performed. The operation of step (1) is performed.

Contents of error display

Error display

Contents of an error

Er  01

Er  02

when TOC information cannot be read normally.

When a PU-IN SW detection error occurs.