MD-MS200W/MD-MS200/MD-MS200H
– 17 –
(1) Replace E
2
-PROM.
(2) Deprive E
2
-PROM of protection (connect the pins 8 and 2 of IC402).
(3) Refer to the latest E
2
-PROM data list.
(4) Press the Display/Lower-case Character button, Enter/Synchro button and Play/Pause button to start the test mode.
(5) Version display
[ V e r . ]
E
2
-PROM version (C ~ Z)
Microcomputer ROM version
(6) The whole LCD lights.
(7) Test mode stop state
[ T E S T ]
(8) Press the Enter/Synchro button.
[ E E P R O M ]
(9) Perform the operation to display "E
2
-PROM SETTING MODE CHART", compare the E
2
-PROM DATA LIST with the
display, and set according to the E
2
-PROM DATA LIST with the VOL UP or VOL DOWN key.
(10) Set the temperature reference. (Refer to the Temperature Reference Setting Method.)
(11) Set according to the E
2
-PROM DATA LIST.
(12) Press the Stop button.
[ T E S T ]
(13) Press the Stop button.
(14) After data is written in E
2
-PROM, turn off power .
(15) Restore protection of E
2
-PROM (Disconnect connection made in Step (2) above).
E
2
-PROM (IC402) writing procedure
1. Procedure to replace E
2
-PROM and write initial value of microcomputer in E
2
-PROM
2. Temperature reference setting method (to be performed at room temperature 21 to 29
°
C)
(1) Test mode stop state
[ T E S T M O D E ]
(2) Measure voltage of TEMP terminal (pin 3, IC401) of microcomputer.
(3) Calculate the temperature reference, using the following formula.
(4) Round down decimal fractions of calculated temperature reference, and convert it to hexadecimal value.
(5) Correct the temperature according to the table below depending on ambient temperature.
Temperature reference =
Measured voltage x 256
2.8
Ambient temperature
Temperature correction
21 - 23
+ 1
24 - 26
±
0
27 - 29
- 1
An example: Environmental temperature is 22
°
C and set voltage is 1.25V.
Temperature reference =
1.25 x 256
2.8
= 114.286
= 114
(Decimal fraction is rounded down.)
= 72
H
(Conversion to hexadecimal value)
(6) Press the BASS button, and press the SKIP DOWN button.
[ E E P R O M ]
(7) Press the PLAY button, and press the SKIP button.
[ T e m p ]
(8) Press the PLAY button.
[ T E M P ]
: Temperature reference
(9) Set the temperature standard value to the value obtained above with the VOL UP and VOL DOWN buttons.
(10) Press the STOP button.
[ T E S T ]
Содержание MD-MS200H
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