Sanyo FISHER DVD-1500 Service Manual page 38

MPEG P.W.BOARD OPERATIONAL
(Check wave form)
5 IIC - BUS signal (IC101 Pin 5,6)
6 FRONT communication
Performs the communication between IC102 (EEPROM) and IC002 (video
encoder).
An unsuccessful communication fails to proceed to the next step. Compare the
waveform of this part with the following waveform or that of a good unit.
If there is an abnormality, check the communication destination (IC101, IC002)
and/or micon port.
- In the absence of the indication despite the presence of the above
waveform, the effect of static electricity or the difference in voltage
from that of the device connected (the presence of difference in voltage
large enough to cause an electrical shock) is conceivable. In the case
of an independent failure, a mere open or touch is suspected.
- When a tactile switch is not accepted, check for a flux rise at the
tactile switch. An abnormal VFD DO signal (pin 3 of CN810) prevents
KEY signals from being accepted.
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