Sony DAV-S300 (serv.man2) Service Manual ▷ View online
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(e) Setting of tray position
Mechanical switch detects the tray position. If the tray is open, DVD circuit closes the tray,
letting loading motor rotate and then set to the status “loaded”.
In case that the tray doesn’t close within a certain period, open the tray by
counter-rotating the motor to set “Ejected” status.
If the tray operation doesn’t complete within a certain period, stop the tray control as it is.
In this case, the status (open/close) is displayed when the control is stopped.
(Repair Know-how) Tray doesn’t work.
Confirm by moving the tray manually whether mechanical operation isn’t getting heavy
due to catching foreign object. When you use a screwdriver for moving the tray, pay
attention to not damaging to screw hole. (Refer to page 4 on Service manual)
In case that loading motor driver (IC802) becomes extremely hot, confirm output of
loading motor. If no output found, change IC.
(Repair Know-how) After power is turned ON, power is turned OFF automatically.
Open the tray a little manually, confirm whether it is loaded normally. Also, touch loading
motor driver(IC802) for your confirmation whether it becomes extremely hot or not.
(Repair Know-how) Operation of detection switch
If the tray position is normal, the status becomes as follows:
Figure 1, Detection switch
Terminal Close/
Chucking
Full open/
Unchucking
IC601 64pin OCSW1
H
L
IC601 88pin CKSW1
L
H
(f) Setting of OP block position
By Servo SP(IC701) output, sled driver(IC802) lets sled motor rotate and move OP block
to the most inner radius. Servo DSP(IC701 23pin) with Limit-In switch input detects the
move of OP block to the most inner radius. Return to the outer radius a little when OP block
moves to the most inner radius.
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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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and “NO DISC” is displayed.
（Reference） Detection of Disc Type
Disc type during playback is automatically detected according to the difference of MIRR
signal created from the reflected laser light from media such as DVD-SL / DVD-DL / CD. If
it’s not detected correctly, confirm the value of P-P of RF signal and also make sure
whether reflected laser light is correctly detected. If the proper detection is impossible,
change OP block.
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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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