Sony DVP-S300 Training Manual page 96

Note:
Check these Serial Numbers also. If your serial number falls within the following range, You must change the following resistors
on the main board, as well as the SYSCOM ROM. After resistors are changed, perform the Drive Auto Adjustment. If unit is not in
range,confirm version of SYSCON, replace if necessary, and do the Drive Adjustment.
DVPS330 100001 to 135300 and 800001 to 836000
DVPS530D 800001 to 840000
DVPS550D 800001 to 843000
DVPC650D Not Applicable
RESISTORS Remove and Replace with new part
R305 (NEW PART )
Part Number 1-216-837-11
R307 (NEW PART
Part Number 1-216-839-11
Change from 10K Ω to 22K Ω
Change from 15K Ω to 33K Ω