Sharp VC-MH80 Service Manual page 61

VC-MH80
REPLACEMENT OF IC703 (E2PROM)
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.
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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