Explanation Of Mechanism Error - Sharp MD-R3 Service Manual

MD-R3
Error display
DEFECT
TOC W ERROR
MD ERROR
Error display
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 (IC402) writing procedure
1. Procedure to replace E 2
value of microcomputer in E
2
(1) Replace E -PROM.
(2) Refer to the latest E 2 -PROM data list.
(3) Holding down the ENTER button and MD PLAY button,RESET
button, and start up the test mode.
Press the MD STOP button.
(4) Indication of version.
[ t s m e ]
(5) Press the ENTER button 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
key.
(7) Set the temperature reference value.
(Refer to "Temperature reference setting procedure".)
(8) The setting must conform to the E
(9) Perform the AUTO per-adjustment and the AUTO adjustment.
(10) Turn off power supply to write in E
Errors
• 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.
• Auto pre-adjustment is not complated.

EXPLANATION OF MECHANISM ERROR

HINF (IC1401 97 PIN)
< 1.3 V
> 3.06 V
1.853~2.48 V
1.3~1.853 V
-PROM and to write the initial
2
-PROM
E 2 -PROM version (01~)
Microcomputer ROM version
Model code
2 -PROM setting mode
2 -PROM data list, and
2 -PROM data list, using JOG
2 -PROM data list.
2 -PROM.
• Check that the disc is free from flaw,
• Check that the record head contact is
• Prefrom AUTO pre-adjustment.
• Once reset, and redo. If error occurs
Ejection failure
Head-up failure
Head-down failure
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.
Ambient temperature
12.2 ~ 15.8
15.9 ~ 19.6
19.7 ~ 23.3
23.2 ~ 26.8
26.9 ~ 30.7
30.8 ~ 34.3
34.4 ~ 37.9
An example: When ambient temperature is 22 C and meadured
temperature is 73H
Temperature setting = 73 H - 01 H
* When the measured temperature fluctuates between
two values, take lower one (if temperature fluctuates
between 73H and 72H, take 72H).
(3) Press the ENTER button 7 times.
[ E E P R O M S E T ]
(4) Press the MD PLAY button.
[ F O C U S
(5) Press the ENTER 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
JOG button.
(8) Press the MD STOP button.
[ T e m p
– 30 –
Corrective action
dust, fingerprint and black spot. Check
for disc disalignment and run-out.
normal. Check that there is no broken
wire between PWB and the recording
head.
persistently, replace EEPROM.
Errors
]
( C)
Temperature correction
-3
-2
-1
0
+1
+2
+3
= 72 H
]
]
]
: Temperature setting
]