Sharp XL-UR250H (serv.man3) Service Manual ▷ View online
XL-UR250H
2 – 1
CHAPTER 2.
ADJUSTMENTS
[1] CD Section
1. CD SECTION
• Adjustment
Since this CD system incorporates the following
automatic adjustment functions, readjustment is not
needed when replacing the pickup. Therefore,
different PWBs and pickups can be combined freely.
automatic adjustment functions, readjustment is not
needed when replacing the pickup. Therefore,
different PWBs and pickups can be combined freely.
Each time a disc is changed, these adjustments are
performed automatically. Therefore, playback of
each disc can be performed under optimum
conditions.
performed automatically. Therefore, playback of
each disc can be performed under optimum
conditions.
Items adjusted automatically
1) Offset adjustment (The offset voltage between the
head amplifier output and the VREF reference
voltage is compensated inside the IC.)
voltage is compensated inside the IC.)
* Focus offset adjustment
* Tracking offset adjustment
2) Tracking balance adjustment
3) Gain adjustment (The gain is compensated inside
the IC so that the loop gain at the gain crossover
frequency will be 0 dB.)
frequency will be 0 dB.)
* Focus gain adjustment
* Tracking gain adjustment
2. CD ERROR CODE DESCRIPTION
* 'CHECKING'
If Error is detected, 'CHECKING' will be displayed
instead of 'ER-CD**'. 'ER-CD**' display will only be
displayed when error had been detected for the 5
instead of 'ER-CD**'. 'ER-CD**' display will only be
displayed when error had been detected for the 5
th
times.
Error
Explanation
10*
CAM error. Can't detect CAM switch when CAM is moving.
11*
When it detect cam operation error during initialize process.
20*
TRAY error. Can't detect TRAY switch when TRAY is
moving.
moving.
21*
When it detect TRAY operation error during initialize
process.
process.
XL-UR250H
2 – 2
[2] Test Mode
• Setting the test mode
During stand-by mode, press STOP button while
pressing down the
• Setting the test mode
During stand-by mode, press STOP button while
pressing down the
button and
button. Then,
press the CD button to enter the test mode.
\
3
44
IL isn’t done
OPEN/CLOSE operation is using manual.
IL isn’t done
C D
T E S T
<<
>> key input.
Laser ON.
Focus ON
CLV Servo ON
<<STOP>> key input.
<<STOP>> key input.
1
Step
2
Step
3
Step
4
Step
5
Step
/
<<
>> key input.
/
<<
>> key input.
/
<<
>> key input.
/
<<
>> key input.
/
Tracking Servo ON
Reading Sub-code and Display
STOP and return to Step 1
Hold down << CD >> key for more than 2 sec.
Start Auto Adjustment at current pick-up location.
XL-UR250H
2 – 3
During at Step , if press << >> for more than 1 sec, it directly
goes to step .
goes to step .
To cancel: Power OFF
<<STOP>> key input.
a) Focus Balance
= FB : XX
b) Focus Gain
= FG : XX
c) Tracking Balance
= TB : XX
d) Tracking Gain
= TG : XX
e) Focus Offset
= FOFF : XX
f) Tracking Offset
= TOFF : XX
g) RFRP
= RFRP : XX
h) Focus Error
(RW Judgement)
(RW Judgement)
= RW : XX - XXXX
i) Focus Error
(Other than RW Judgement) = DA : XX - XXXX
(Other than RW Judgement) = DA : XX - XXXX
Sliding the PICKUP with << >>, << >> button can be set
in STOP mode or play mode.
in STOP mode or play mode.
/
STOP and return to Step 1
1
5
Note
STOP and return to Step 1
Everytime << DISPLAY >> key input
XL-UR250H
2 – 4
[3] Standard Specification Of Stereo System Error Message Display Contents
(*) CHECKING:
If CD changer mechanism error is detected, 'CHECKING' will be display instead of 'ER-CD**'. 'ER-CD**' will only be
display when error had been detected for the 5
display when error had been detected for the 5
th
times.
Speaker abnormal detection and +B PROTECTION display
In case speaker abnormal detection or +B PROTECTION had occurred, the unit will automatically enter to stand-by
mode and Timer indicator will flashing as below.
mode and Timer indicator will flashing as below.
Example:In case of speaker abnormal
BEFORE TRANSPORTING THE UNIT
The following process need to be taken after set tapering/parts replacement.
1. Press the POWER ON/STAND-BY button to enter stand-by mode.
2. While pressing down the
button and the
button, press the button. The Micro Computer version
number will be displayed as "XR H****” and " FW****V**”.
3. Press the
button until "WAIT"--> "FINISHED" appears.
4. Unplug the AC cord and the unit is ready for transporting.
Error Contents
DISPLAY
Notes
CD
CD Changer Mechanism Error. ‘ER-CD**’ (*)
10: CAM SW Detection NG during normal operation
11: CAM SW Detection NG during initialize process
20: TRAY SW Detection NG during normal operation
21: TRAY SW Detection NG during initialize process
11: CAM SW Detection NG during initialize process
20: TRAY SW Detection NG during normal operation
21: TRAY SW Detection NG during initialize process
Focus Not Match/IL Time Over. ‘NO DISC’
TUNER
PLL Unlock.
FM
MHz
PLL Unlock.
87.50
TIMER
LED
LED
OFF
OFF
OFF
1
OFF
OFF
OFF
OFF
FRAME
(REPEAT)
FLASHING
FLASHING
NO. 2
NO. 2
ON
ON
ON
ON
NO. 1 : +B PROTECTION
NO. 2 : Speaker abnormal
NO. 2 : Speaker abnormal
NO
NO. 1
. 1
3
4
4
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