JVC TH-C90A Service Manual page 41

STEP OPERATION
Press 10 at 10 key of remocon.
5
Press STOP key of main unit/
6
remocon.
Press OPEN/CLOSE key of main
7
unit/remocon.
Press PLAY key of main unit/
8
remocon.
Press MENU key of remocon.
7
Press POWER key of main unit.
*1 Mode toggle by press MENU key.
*2 STEP2-3 and STEP3 are only for DVD-AUDIO or VR correspondence model.
4.3 DVD special mode
4.3.1 Special mode
Mode name
DVD up grade
ROM CORR
(System micon)
ROM CORR
(Mecha micon)
4.3.2 DVD upgrade
Processing FL indication
TOC READ "READING"
DATA READ "UPGRADE"
WRITING
"_OPEN_"
"_OPEN_"
END
4.3.3 ROM correction (System micon)
Processing FL indication
TOC READ "READING"
DATA READ "ROM_CORR"
WRITING
"ROM_CORR"
END "COMPLETE"
*ROM CORR data confirm
The following processings are performed in order to prevent that fault occurs, when a new micon / the old micon / ROM collection is
intermingled.
The data (ID) which a micon should make a judgment standard is stored in a [E2PROM] start address [2 bytes].
A data format presupposes that it is free (the version of the data which can be differentiated etc. is desirable).
When the [ROM coll data area] of [E2PROM] is read at the time of a reset start and data exists, it processes by judging whether it is
by the [ROM coll] data which should be applied.
In the case of the data which should be applied [good] : It progresses to the following step by un-processing.
In the case of the data which should be applied and which does not come out, it is [no] : All the [ROM coll data area] of [E2PROM] is cleared (FF).
MOVEMENT
DVD-DL (parallel, opposite),
Serch & jitter measurement of the
specified position of DVD-SL.
Disc stop, LD-OFF.
Tray open/close.
Disc playback.
Return to STEP2.
Releasr the TEST MODE.
Operation
Load up grade disc
Load ROM CORR disc
Load ROM CORR disc
Display (OSD) indication
NOW READING
VERSION UP DISC
PROGRAM&DESTINATION MODE
CURRENT VERSION
NEW VERSION
READING..
SECTOR
VERSION UP DISC
PROGRAM&DESTINATION MODE
CURRENT VERSION
NEW VERSION
WRITING..
OPEN
Display (OSD) indication
NOW READING
VERSION UP DISC
SYSCON UPG MODE
CURRENT VERSION
READING..
SECTOR 1
VERSION UP DISC
SYSCON UPG MODE
CURRENT VERSION
WRITING..
VERSION UP DISC
SYSCON UP MODE
CURRENT VERSION
WRITING..
FL (LCD) indication
1 2 3 4 5 6 7 8 9 10 11 12 13
C H E C K
Function
Do the update the DVD firmware.
Do the repair of system micon problem.
Model number of ROM CORR is A300
Do the repair of mecha micon problem.
Invalid the inside of TEST mode.
Remarks
TOC reading
Disc data reading
Indicate firm current versin, new version and reminder sector
quantity.
Only [POWER] [OPEN/CLOSE] key of a main unit is validated.
Writing the data to flash rom.
Input a main unit and all the key of remote control are forbidden.
Upgrade completed.
Prohibition of a key input is canceled as initialization end status.
Remarks
TOC reading
Disc data reading
Indicate firm current versin.
Only [POWER] [OPEN/CLOSE] key of a main unit is validated.
Writing the data to EEPROM.
Input a main unit and all the key of remote control are forbidden.
ROM CORRECTION completed.
Prohibition of a key input is canceled as ROM CORR completed
status.
REMARKS
Upper:0x00-0x06
(Measured position with VT-501)
Lower:Jitter value
Upper:Laser current value
(Backup value, Real measured value)
Lower:Jitter value
When this key is pushed any STEP, the test
mode is canceled.
(No.MB570)1-41