Doctor Program System In The Present Circumstances - JVC GR-DVA10 Technical Manual

4.2 DOCTOR PROGRAM SYSTEM IN THE PRESENT CIRCUMSTANCES

Though it explained about the outline of the Doctor Program and the doctor complying with of the service
support system software in the preceding clause, it explains here about the present circumstances of the
Doctor Program system.
4.2.1 ON/OFF address and Program address
The Doctor Program system is stored in the EEPROM. The system is divided into two blocks; one is the
ON/OFF address block and the other is the program address block. Each address varies in the model.
Moreover, those blocks may be away.
In case of this model, the ON/OFF addresses are (1ACh
2F4h, 77h, DAh DFh). For other models, refer to the "table 4-2-3. Address list of Doctor Program" of the
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postscript.
The contents of the ON/OFF address and the program address are as mentioned in the following.
For the ON/OFF addresses, write as follows.
To answer to the Doctor system: 1ACh = "12h" / 1ADh = "34h" / 1AEh = "56h" / 1AFh = "78h"
Not to answer to the Doctor system: 1ACh to 1AFh = "00h"
For the program addresses, write as follows.
To answer to the Doctor system: Programmed data
Not to answer to the Doctor system: "FEh" or any data
It can be considered that there are four kinds of combinations in theory, and those combinations determine
ON or OFF of the Doctor Program system. As shown in the Table 4-2-1, the combination that turns the
Doctor Program system on is the pattern (1) only. The pattern (2) turns the Doctor Program system off
because "FEh" is written for all the program addresses, in which "FEh" is a cancelable data even when the
ON/OFF address is in the ON status. The pattern (3) is invalid even when an optional data is written in,
because the ON/OFF address is in the OFF status. In practice there are two patterns of (1) and (4).
In case of the pattern (1), if "33h" is written for the address 1ADh for example, the Doctor Program system
turns off. When all aforementioned data are written in four addresses properly, and Doctor Program
system becomes on for the first time.
ON/OFF Address
Table 4-2-1 Combinations of ON/OFF Address and Program Address
1ACh = 12h
1ADh = 34h
1AEh = 56h
1AFh = 78h
(ON)
1ACh = 00h
1ADh = 00h
1AEh = 00h
1AFh = 00h
(OFF)
1AFh), and program addresses are (2A4h
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Program Address
Programmed Data
ON...(1)
OFF...(3)
4-5
"Feh"
or any data
OFF...(2)
OFF...(4)
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