Sony DVP-S300 Training Manual page 68

Fourth Generation DVD
The fourth generation DVD players consist of models DVP-S350, DVP-
S560, DVP-S560, DVP-S570, DVP-C660d and DVP-C670d.
Symptom 4: Multiple Symptoms -
1. No chroma from the S video output jack; or
2. No component video (Y, B-Y, R-Y) output. The com-
posite video output is OK in both cases.
Cause: Output Video Buffer IC101 failure
Repair Procedure
In the following steps you will remove the MB board from under the mecha-
nism deck and use the jig to operate the board and the mechanism out-
side the unit. This way you can check the video signal entering the video
buffer and verify IC101's defect.
1. You can damage the laser when unplugging the laser assembly. To
prevent this, either short out the laser diode with a solder blob on the
ribbon cable or use an anti static mat with a wrist strap.
2. Set up the jig (P/N J-6090-100A) to operate the MB board outside the
unit (you have to take out the MB board anyway to replace IC101 so it
will take an extra two seconds to check the signal and prove IC101 is
the cause of this symptom).
3. Press power ON, insert a disc and press the play button to keep the
unit powered ON.
4. Check IC101's input signals at the extender board's CN103 pins:
Signal Level *
Composite video 1Vp-p
S Video - Chroma 0.6Vp-p
S Video - Luminance 0.9Vp-p
Component Y 0.9Vp-p
* Typical level taken from four sample movies +0.1V.
Test point name CN103/pin
JL103 25
JL104 21
JL105 17
JL107 4
65
If these input signals are present at the test points of the extender board
but not at the rear panel jacks, replace buffer IC101 on the bottom of the
AI board.
Alternate Test Procedure
You can also check for chroma leaving the MB board at IC502/pin 77
without disassembly. IC502 is located to the right of the tray/laser assem-
bly and accessible while the player is fully assembled.
Tray/laser assembly
1. Turn the DVD player ON by pressing the power button. The player
will enter Standby (red light). Press tray open or play to power the unit
ON. The power supply will remain ON and the front panel display will
light.
2. Within two seconds after a communications check is completed, the
color DVD logo will appear on the TV screen. The logo is shortly
replaced by an "Insert Disc" message on a blue stripe. If the message
is in B&W, place your scope probe at the left side of R506 behind
IC502. If there is signal (chroma) present, Video Buffer IC101 on the
bottom of the AI-17 board is defective. IC502/pin 77 = 0.6Vp-p, 10usec/
div.
T
1
P K D
C H 1 2 0 0 m V = M T B1 0. 0 us - 0 . 88 d v c h 1 -
IC502/pin 77 = 0.6Vp-p, 10usec/div.
R506
77
61
60
IC502
1
Chroma
H sync pulses