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Vc-H91GM(BK)
VC-H91SM(BK)
VC-H92GMI(BK
REPLACEMENT OF IC703 (E2PROM)
< Servicing precautions >
When the IC703 (E2PROM) has been replaced, make the following reprogramming.
Depending on models, the 1C703 (E2PROM) has been factory adjusted for it's memory function.
It's therefore necessary to reprogram the memory function for the model in question.
Note that the servo circuit requires readjustments for the HEAD SWITCHING POINT, SP/LP SLOW TRACKING
PRESET and FV (False Vertical sync) of STILL PICTURE modes.
(1) Memory function reprogramming.
1.
2.
3.
5.
Check the power off. (Power is standby mode)
Make for a moment short-circuit between TP5003 and TP5004 on the main PWB.
Be sure that all the fluorescent display tubes light up into the TEST mode.
Using the CHANNEL (+) and (-) buttons, select the right function numbers from among JP0-JP31, which
appear in the fluorescent display tube, referring to the E2PROM map. (See Table A).
Press the DISPLAY button to pick up the functions (ON) and the CLEAR button to discard the functions
(OFF).
DISPLAY and CLEAR buttons are located on the remote control unit.
* When the DISPLAY button has been pressed (ON), the memory function No. starts flashing.
* When the CLEAR button has been pressed (OFF), the memory function No. lights up.
. Make the short circuited cathode of D5004 and jumper pin 345 on the main PWB, and the settings will be
displayed in hexadecimal notation.
Now you can see if the settings are correct.
Example:
"ON" and "OFF" are taken as "1" and "0" respectively.
The numbers JPO to JP31 are divided
into eight groups and each group's setting is displayed in hexadecimal notation.
J31
J30
J29
J28
J27
J26
J25
J24
J23
J22
J21
J20
J19
J18
J17
516
0
0,
0
O
0
a
0
0
ae
0
0
0,
0
O
SPACE
0
0
J15
314
J13
J12,
511
#310
JD
J8
JT
S60
OS
4B
DessSSsS
0
is
0
0
1
0
60
0
ae
0
1
1
L
0
4
0
"000040D"" appears in the fluorescent display tube.
Finally make for moment short-circuit between TP5003 and TP5004 on the main PWB to clear the TEST
mode or press the operate button to turn the power on.
(2) Memory guide channel mapping of VIDEO plus + reprogramming (VC-H92GMonly)
1. Press the MENU key to call the MENU on the screen. (Make presetting while watching the TY mnonitor
screen.)
2. Slect No.7 and call the GUIDE CH Preset on the screen.
3. Adjust the initial mapping of the GUIDE CH (3 digits) to the PRESET CH. See the accompanying tale (8).
Note: The table (B) covers the initial mapping data that have been factory-set. If the data hve been
modified by the user, it is better to enter the modified data.
67
)
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