Read Sony DAV-S300 (serv.man2) Service Manual online
6
If the position setting doesn’t complete within a certain period, move to next operation
automatically.
(Repair Know-how) Sled operation of OP block
Even if OP block is in the most inner radius from first, sled operation is performed to
return to the outer radius a little. If no sled operation is available, touch sled motor
driver(IC802) and confirm whether it becomes extremely hot or not. Also, confirm
input/output of driver and the cancellation of muting (IC802 9pin : L => H)
(g) Setting of Tilt default
By Servo DSP(IC701) output, tilt driver (IC801) lets tilt motor rotate and OP block tilt
default set.
(Repair Know-how) Setting of Tilt default
In case that OP block doesn’t perform tilt default setting, confirm TLTA, TLTB signal
(IC801 23,26pin) and TILT MUTE signal (IC801 20pin).
(h) Image output
Initial screen is output from video terminal. Data of initial screen is stored in ROM(IC205
or IC206) and output to AV decoder(IC401) via serial bus. And, the initial screen signals are
output by YC signal (IC401,61, 62 pin) and COMP OUT signal (IC401 65pin).
(IMPORTANT) Initial screen is not displayed.
If the setting from (a) to (g) is not completed due to a defect of mechanical switch and so
on, initial screen is not displayed. In case that image is not displayed, confirm each
mechanical operation is completed.
(Repair Know-how) Check of image output
If you confirm image output, confirm both S terminal and VIDEO terminal. If no output
found, confirm signal output path from AV decoder (IC401).
(i) Focus search
It detects whether disc is loaded or not. If there is enough amount of reflected light from a
disc, reading disc is started, letting disc rotate. If just focusing is unavailable, repeat
detection twice, changing search point.
In case that reflected laser light can’t be detected with OP block, it judges as “NO DISC”
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