SD-NX10 (serv.man6). Part 3 - Description of circuit, Block diagrams - Sharp Audio Service Manual (repair manual). Page 7

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Outline: To test the AUX operation

Operation

a. Press the VOL-UP/DOWN button.

MIN (0) 

←→

 1 

←→

 250 

←→

 MAX (40)

(The volume can be switched among 4 levels.)

b. Switching of the graphic equalizer and switching test for X-BASS ON/OFF and SURROUND ON/OFF are possible.
c. Press the POWER button to exit the AUX test mode.

Outline: To check if KEY data are input to the microcomputer accurately

Operation

All lights of segments on FL go off while the keys are not effective.
Segments corresponding to the keys are lit up as shown below.
The power button is an exception; 2 seconds after all lights are lit, the TEST mode is cancelled.

POWER

TEST mode canceled 2 seconds after all lights are lit

VOLUME UP

kHz

VOLUME DOWM

MHz

TUNER/BAND

[FM]

AUX (DEMO)

[AUX]

ERASE

TOC

MD EJECT

AM

MD PLAY

PM

MD STOP

[MD]

MD REC

REC MARK

REC MODE

LP2

PLAY-MODE

REPEAT MARK

+10

LP4

MD SKIP-UP

REC

MD SKIP-DOWN

PLAY

CD/MD OPEN/CLOSE

RANDOM

CD EJECT

FLAG MARK

CD PLAY

PLAY MARK

CD STOP

[CD]

CD SKIP-UP (TUNING 

 / 

 )

[ST]

CD SKIP-DOWN (TUNING 

 / 

 )

STEREO

Outline: To test the accurate operation of the tuner

The following presets are written.
a. Reception of Preset 1.
b. Press the POWER button to cancel the TEST mode. In this case, preset is entirely erased.

P  1

P  2

P  3

P  4

P  5

P  6

P  7

P  8

P  9

P10

P11

76.0

108.0

77.0

106.0

89.0

83.0

522k

1629k

603k

1404k

990k

PNO Display

FM/AM Flickering

AM

FM

TUN TEST