Sanyo FISHER DVD-1500 Service Manual page 6

DVD P.W.BOARD OPERATION
(Actuating description)
1. After turning on the power or inserting a disk, this DVD Assy starts to perform a disk identification operation.
1) Sets the circuit to the DVD mode, returns the pickup, lowers the lens an lights the LASER lamp.
The pickup return, lens operation and LASER lamp illumination are visuall recognizable.(spindle kick)
2) In PU mode (CD), raises the lens.
Focus level measurement (A), judges the FE pulse whether to be 1 or 2.
3) In PU mode (DVD), lowers the lens.
Focus level measurement (B).
4) Judgment pulse 2 : DVD two-layer disk,
(B)/(A)>1.5 : DVD one-layer disc.
Other than the above condition : CD
5) Sets the circuit to the PU mode (based on the above disk judgment, the circuit is set to the PU mode)
6) Servo attracting operation (servo turns on):CLV turns on in the same way as a CD player.
The orientation that optical lens
FOCUS DRV.
IC601 25pin
①
FE
TP513
TE
TP512
SLED
IC601 20pin
VRA
CD
Disc distinction
DVD
one-layer
disk
DVD
t w o - l a y e r
disk
② ⑤ ⑥
③
DiskDistinction
④
FServoCLV ON
TServo ON
pick return play (If there is pick in perimeter of a circle,
there is it, and time of bottom gets longer)
Disc distinction
Disc distinction
Focus error signal（lens distant→near）
Focus point
Don't Servo on
Servo on
Disc distinction
Zoom
Two Focus err.
- 5 -
Image
Disc distinction
level difference
Disc distinction