JVC UX-QX3WA Service Manual page 25

(2) EEPROM writing timing
When abnormality occurs respectively, the value of the generated item is rewritten.
at the following.
The writing method does the batch writing 16 bytes with PAGE WRITE.
exp.) The data taking to EEPROM
address 120
data 01
After it shifts in the direction of the subordinate position by one byte, "20" is written at head byte when ERROR
information new "20" is written. The data of final byte is thrown away.
address 120
data 20
(3) EEPROM clear condition
When COLD SET is fixed by remote control code [ 0 ]+[
cleared (ALL0x00).
RECEIVE
[ 0 ]
+
[ ]
+
[STANDBY/ON]
Do not clear EEPROM when COLD SET processing at power to ON.
In case of clear EEPROM, so that the ERROR HISTORY data may disappear when the set returned from the user.
4.2.3 Reading the ERROR HISTORY
Reading ERROR HISTORY is assumed to be able to read set both POWER ON and turning off.
The reading method is done by the following ways.
No. Operation
1 Receive the remocon code.
[COLOR]+[ ]+STANDBY/ON]
2 Address change to
(skip) key of remote controller.
Address change to
G>>| (GROUP SKIP) key of remote
controller.
Indication is start address to 00 then
indicate staep by 1 byte.
operation exp.) address 00 indicating
Press >>| key
Press G>>| key
Press |<< key
Press G|<< key
Press G|<< key
3 Cancel the mode by remocon code.
[COLOR]+[ ]+STANDBY/ON]
121 122 12D 12E
02 03 0D 0E
121 122 12D 12E
01 02 0C 0D
EEPROM
E.HISTORY
CLEAR
Indication
E R R
0x01 by |<<, >>|
0 0 :
0x10 by G|<<, address
0 1 :
1 0 :
0 F :
0 0 :
F 0 :
12F
0F
12F
0E
]+[STANDBY/ON] receive, the ERROR HISTORY part is
COLD SET
INDICATION
/
PROCESSING
System micon processing
Read out the ERROR HISTORY
I N F O
information from EEPROM.
Indicate the read out value by key
0 1
operation.
data
0 5
2 1
1 1
0 1
0 0
Return to normal function indication.
(No.MB574)1-25