JVC GR-DVA10 Technical Manual page 70

As mentioning above, it is unacceptable by using the service support system software to edit the doctor
area directly at the time of the repair. However, when writing of the initial data or the backup data is done,
the doctor area is also rewritten at the same time. Also, it is possible to turn off or renew the Doctor
Program by using the "Doctor Load" function. Table 4-2-2 shows the combinations that may be probably
programmed in practice now.
Original Data
ON/OFF
Address
ON
ON
OFF
ON
ON
OFF
The following explains each pattern from ∗1 to ∗6.
∗1: For the camcorder that Doctor Program System has been turned on, but it is replaced with another
Doctor Program System for improvement of the performance.
∗2: For the camcorder that has been locked because the data of the Doctor Program was broken for
some reason, the same Doctor Program is written again to release the set from the locked status.
∗3: For the camcorder that Doctor Program System has been turned off, the Doctor Program is written
for improving the performance.
∗4: For the camcorder that Doctor Program System has been turned on, the microcomputer is replaced
with an upgraded one.
∗5: It is required to release the set temporarily from the same locked status as the case ∗2.
∗6: For usual EEPROM data writing, which does not affect the Doctor Program System.
Under the locked condition such as ∗2 or ∗5, if the camera system fails in communication such as it
completely dead, the camera system cannot be recovered by rewriting the data of the EEPROM. In such
the case, it needs to replace the EEPROM with a new one and to write original data in it or to adjust all
items after writing the initial data in the new EEPROM. However, the communication may be recovered by
turning on in the deck mode after disconnecting the DC power supply once and connecting it again if the
deck system does not affected by the trouble. If the communication is recovered by the above means, turn
off the Doctor Program System using the "Doctor Load" function.
Unless there occurs a trouble, don't use the "Doctor Load" function. Usual editing of the EEPROM and
rewriting the initial data don't bring on any trouble.
Program
Address
Correct
Incorrect
" FEh " Change
Correct
Incorrect
" FEh "
Table 4-2-2 Changing situations of Doctor Program
Writing Data
ON/OFF Program
Address Address
ON Correct
ON Correct
ON Correct
OFF " FEh "
OFF " FEh "
OFF " FEh "
4-6
Yes: Normal
No: Locked
Yes → Yes ∗1
No → Yes ∗2
Yes → Yes ∗3
Yes → Yes ∗4
No → Yes ∗5
Yes → Yes ∗6