Service manual

MD-MT180
– 15 –
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 MENU button, ENTER button and Play
button to start the test mode.
(4) Press the VOL.+ button, version display
[ V e r . ]
EEPROM version (c ~ z)
Microcomputer ROM version
(5) Press the VOL.– button, the whole LCD lights.
(6) Test mode stop state.
[ T E S T ]
(7) Press the "BASS" button, and press 3 times the "FAST
REVERSE
" button.
[ E E P R O M ]
(8) Perform the operation to display "EEPROM SETTING
ENTER 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.
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) Press the MENU button, ENTER button and Play
button to start the test mode.
(3) Start the EEPROM mode 'Temp' menu.
• Button operation in order of BASS, FAST REVERSE
x 3 times, PLAY , PLAY in the test mode
STOP state.
• 'TM§§ ' is displayed. (§§= Temperature code,
= Temperature reference)
(4) Once press FAST FORWARD , and determine
the displayed microcomputer TEMP input AD value.
• 'TPin##' is displayed. (## = TEMP input AD value)
(5) At the ambient temperature, determine the tempera-
ture corrected value from the temperature measure-
ment value correction table.
(6) Determine the temperature reference, using the fol-
lowing formula.
• Temperature reference = Microcomputer TEMP
input AD value + Temperature corrected value
(7) 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
[3] Temperature code identification
X
Ambient
temperature
Temperature
correction
Center
temperature
– 9
o
C ~ +10
o
C 08h + 0.5
o
C
+ 3
o
C ~ +21
o
C 07h + 12.5
o
C
+15
o
C ~ +33
o
C 06h + 23.6
o
C
+26
o
C ~ +43
o
C 05h + 35.0
o
C
Ambient
temperature
Temperature
correction
+ 9
o
C ~ +11
o
C - 05h + 10.0
o
C
+12
o
C ~ +14
o
C - 04h + 12.7
o
C
+15
o
C ~ +16
o
C - 03h + 15.4
o
C
+17
o
C ~ +19
o
C - 02h + 18.2
o
C
+20
o
C ~ +22
o
C - 01h + 20.9
o
C
+23
o
C ~ +24
o
C ± 00h + 23.6
o
C
+25
o
C ~ +27
o
C + 01h + 26.3
o
C
+28
o
C ~ +30
o
C + 02h + 29.0
o
C
+31
o
C ~ +33
o
C + 03h + 31.8
o
C
Center
temperature