Read Sony DAV-S300 (serv.man2) Service Manual online
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2. Troubleshooting in Test Mode
In case that Test Mode cannot start up, confirm the set operation, referring to “1.
Troubleshooting at Start-Up”.
(1) Display of emergency history
When you select “4” in Test Mode, you can confirm the contents of error in Emergency
history mode.
If Emergency code is 10/12/14, there is a possibility that the communication between
system controller(IC202) and each digital IC has an error. Confirm soldering of each IC and
connection of each board with connectors etc.
In case that other error is displayed, it’s possible to think that scratch on disc or defects of
OP unit (spindle motor included) may cause an error. Confirm that the value of p-p level of
RF signal is over 0.7V, the balanced difference of S curve of FE signal is 15% or less and
the value of S curve p-p level is over 1.0V. If the level doesn’t recover after cleaning lens,
change OP block.
(2) Syscon Diagnosis
Self diagnosis recognizes defective point automatically if you select “0” in Test Mode and
“1. ALL” in Check Menu.
The screen stops at an item which requires your confirmation, press “NEXT” button and
go ahead. In the case, “OK” is displayed instantly and then goes to next item.
In case that it doesn’t go further even if you press NEXT, confirm the communication
route of IC related.
(3) Video Output Circuit
Color bar for adjusting video level is displayed when you select “6” in Test Mode Menu.
Color bar signal is output from AV decoder according to serial data commander from audio
microcomputer(IC903). If the color bar is output normally, analogue video output circuit
except for OSD operation is normal.
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