Sharp MD-MT88H S Service Manual page 17
Portable minidisc recorder
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Also See for MD-MT88H S:
- Operation manual (52 pages) ,
- Operation manual (56 pages) ,
- Operation manual (152 pages)
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EEPROM (IC402) writing procedure
1. Procedure to replace EEPROM and write initial
value of microcomputer in EEPROM
(1) Replace EEPROM.
(2) Refer to the latest EEPROM data list.
(3) Press the Display button, ENTER button and Play
button to start the test mode.
(4) Press the VOL. + key, version display
[ V e r .
X
(5) Press the VOL. – key, the whole LCD lights.
(6) Test mode stop state.
[
T E S T
(7) Press the "BASS" button, and press twice the "FAST
REVERSE
" button.
[ E E P R O M ]
(8) Perform the operation to display "EEPROM SETTING
MODE CHART", compare the EEPROM DATA LIST
with the display, and set according to the EEPROM
DATA LIST with the VOL. + or VOL. – button.
(9) Set the temperature reference. (Refer to the Tem-
perature Reference Setting Method.)
(10) Set according to the EEPROM DATA LIST.
(11) Press the Stop
button.
[
T E S T
(12) Press the Stop
button.
(13) After data is written in EEPROM, turn off power .
(14) Restore protection of EEPROM.
]
EEPROM version (b ~ Z)
Microcomputer ROM version
]
]
2. Temperature reference setting method
[1] Measurement, calculation and setting procedure
(1) Set the TEST mode.
• Set TEST 1, 0 = '01', and turn on power
(or set PLAY ON in standby state).
(2) Start the EEPROM mode 'Temp' menu.
• Key operation in order of BASS, FAST REVERSE
x 3 times, PLAY
STOP state.
• 'TM§§
' is displayed. (§§= Temperature code,
= Temperature reference)
(3) Once press FAST FORWARD
the displayed microcomputer TEMP input AD value.
• 'TPin##' is displayed. (## = TEMP input AD value)
(4) At the ambient temperature, determine the tempera-
ture corrected value from the temperature measure-
ment value correction table.
(5) Determine the temperature reference, using the fol-
lowing formula.
• Temperature reference = Microcomputer TEMP
input AD value + Temperature corrected value
(6) Set the temperature reference value by button opera-
tion, and check whether the temperature code indica-
tion corresponds to "Temperature Code Identification
Table".
[2] Temperature measurement value correction table
Ambient
temperature
+ 9
o
C ~ +11
o
C
o
o
+12
C ~ +14
C
o
o
+15
C ~ +16
C
o
o
+17
C ~ +19
C
o
o
+20
C ~ +22
C
o
o
+23
C ~ +24
C
o
o
+25
C ~ +27
C
+28
o
C ~ +30
o
C
+31
o
C ~ +33
o
C
[3] Temperature code identification
Ambient
temperature
- 9
o
C ~ +10
o
C
+ 3
o
C ~ +21
o
C
+15
o
C ~ +33
o
C
+26
o
C ~ +43
o
C
– 17 –
MD-MT88H/99H
, PLAY
in the test mode
, and determine
Temperature
Center
correction
temperature
- 05h
+ 10.0
o
o
- 04h
+ 12.7
o
- 03h
+ 15.4
o
- 02h
+ 18.2
o
- 01h
+ 20.9
± 00h
o
+ 23.6
o
+ 01h
+ 26.3
+ 02h
+ 29.0
o
+ 03h
+ 31.8
o
Temperature
Center
correction
temperature
08h
+ 0.5
o
07h
+ 12.5
o
06h
+ 23.6
o
05h
+ 35.0
o
C
C
C
C
C
C
C
C
C
C
C
C
C
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