VC-MH80
VC-MH90
REPLACEMENT OF
IC703
(E2PROM)
eservicing
precautions+
When the
IC703
(EZPROM)
has been replaced, make the following reprogramming.
Depending on models, the
IC703
(EZPROM)
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.
Memory function reprogramming.
1. Check the power off. (Power
isstandby
mode)
2. Make for a moment short-circuit between test jumpers 3 and 4 located on the timer PWB.
Be sure that all the fluorescent display
tubes,ljght
up into the TEST mode.
3. Using the CHANNEL
(+),and
(-)
buttons,
select
the right function numbers from among JPO-JP31, which
appear in the fluorescent display tube, referring to the
E2PROM
map.
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
4. Finally make for moment short-circuit between test jumpers 3 and 4 located on the timer PWB to clear the
TEST mode.
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