Sharp MD-X7H Service Manual page 64

MD-X8H
Error display
BLANK MD
DEFECT
TOC W ERROR
MD ERROR
PROTECT
* For details refer to Trouble-shooting (page75).
M E C H A _ E R R 1 _ *
M E C H A _ E R R 2 _ *
M E C H A _ E R R 3 _ *
* = E Ejection completion position
* = MHorizontal midway position
* = L Load completed position
* = D Head-down position
2
E -PROM (IC1402) writing procedure
1. Procedure to replace E
value of microcomputer in E
(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
(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
chart", compare the indication with the E
make a setting according to the E
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
(9) Turn off power supply to write in E
• 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.
EXPLANATION OF MECHANISM ERROR
Error display
HINF (IC1401 97 PIN)
< 1.3 V
> 3.06 V
1.853~2.48 V
1.3~1.853 V
2
-PROM and to write the initial
2 -PROM
]
E 2 -PROM version (c to z)
Microcomputer ROM version
Model code
2 -PROM setting mode
2
-PROM data list, and
2
-PROM data list, using VOL
2 -PROM data list.
2 -PROM.
Errors
Ejection failure
Head-up failure
Head-down failure
2. Temperature reference value setting procedure
(to be executed at room temperature within 21 to 29
(1) Test mode stop state.
[ t s m
(2) Crrect temperature depending on ambient temperature according
to the following table.
Ambient temperature
+ 12.2 °C ~ + 15.8 °C
+ 15.9 °C ~ + 19.6 °C
+ 19.7 °C ~ + 23.2 °C
+ 23.2 °C ~ + 26.8 °C
+ 26.9 °C ~ + 30.7 °C
+ 30.8 °C ~ + 34.3 °C
+ 34.4 °C ~ + 37.9 °C
An example: When ambient temperature is 22°C and meadured
(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,
(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
– 28 –
Corrective action
• 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.
Errors
e ]
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).
]
]
]
: Temperature setting
]
°
C)
correction
-0 3
H
-0 2
H
-0 1
H
± 0
H
+0 1
H
+0 2
H
+0 3
H