Sharp MD-X7H, Руководство по обслуживанию

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MD-X8H
– 28 –
• UTOC was read but total TNO and the number of characters of
NAME was 0?
• Focusing error was caused by shock during REC-PLAY.
• Although UTOC can be read but UTOC cannot be rewritten.
• Data of EEPROOM is not correct.
• As a result of occurrence of failure in the power amplifier circuit
stage the power supply is turned off, and the "PROTECT" error
display blinks.
Error display Errors Corrective action
BLANK MD
DEFECT
TOC W ERROR
MD ERROR
PROTECT
• Perform recording to check that the disc
is recordable disc.
• Check that the disc is free from flaw,
dust, fingerprint and black spot. Check for
disc disalignment and run-out.
• Check that the record head contact is
normal. Check that there is no broken wire
between PWB and the recording head.
• Once reset, and redo. If error occurs
persistently, replace EEPROM.
• Check, applying the trouble-shooting
described below.
EXPLANATION OF MECHANISM ERROR
Error display
Errors
M E C H A _ E R R 1 _ * Ejection failure
M E C H A _ E R R 2 _ * Head-up failure
M E C H A _ E R R 3 _ * Head-down failure
HINF (IC1401 97 PIN)
* = E Ejection completion position < 1.3 V
* = MHorizontal midway position > 3.06 V
* = L Load completed position 1.853~2.48 V
* = D Head-down position 1.3~1.853 V
E
2
-PROM (IC1402) writing procedure
1. Procedure to replace E
2
-PROM and to write the initial
value of microcomputer in E 2 -PROM
(1) Replace E
2
-PROM.
(2) Refer to the latest E
2
-PROM data list.
(3) Hold down the button and MD PLAY button, and press the
POWER button to enter the test mode.
(4) Indication of version.
[ t s m e ]
E 2 -PROM version (c to z)
Microcomputer ROM version
Model code
(5) Press the CD PLAY key 7 times.
[ E E P R O M S E T ]
(6) Perform the operation shown in the "E
2
-PROM setting mode
chart", compare the indication with the E
2
-PROM data list, and
make a setting according to the E
2
-PROM data list, using VOL
UP botton or VOL DOWN button.
(7) Set the temperature reference value.
(Refer to "Temperature reference setting procedure".)
(8) The setting must conform to the E
2
-PROM data list.
(9) Turn off power supply to write in E
2
-PROM.
2. Temperature reference value setting procedure
(to be executed at room temperature within 21 to 29
°
C)
(1) Test mode stop state.
[ t s m e ]
(2) Crrect temperature depending on ambient temperature according
to the following table.
An example: When ambient temperature is 22
°
C and meadured
temperature is 73H
Temperature setting = 73 H - 01 H
= 72 H
* When the measured temperature fluctuates between
two values, take lower one (if temperature fluctuates
between 73H and 72H, take 72H).
(3) Press the CD PLAY button 7 times.
[ E E P R O M S E T ]
(4) Press the MD PLAY button 1 times.
[ F O C U S ]
(5) Press the CD PLAY button 4 times.
[ T e m p ]
(6) Press once the MD PLAY button.
[ T E M P ]
: Measured temperature, : Temperature setting
(7) Set temperature to the value determined above, using the
VOL UP or VOL DOWN button.
(8) Press the MD STOP button.
[ T e m p ]
Ambient temperature correction
+ 12.2
°
C ~ + 15.8
°
C -0 3
H
+ 15.9
°
C ~ + 19.6
°
C -0 2
H
+ 19.7
°
C ~ + 23.2
°
C -0 1
H
+ 23.2
°
C ~ + 26.8
°
C
±
0
H
+ 26.9
°
C ~ + 30.7
°
C +0 1
H
+ 30.8
°
C ~ + 34.3
°
C +0 2
H
+ 34.4
°
C ~ + 37.9
°
C +0 3
H
* For details refer to Trouble-shooting (page75).