Testing the LA/BA chip for dud focus coils driver –
A effective way to test the focus/tracking coils for both BA and LA is:
Put multimeter on diode probe/beep mode
(there's a diode symbol on the position)
Find the following signals on the chips:
TR+ (Tracking +)
TR- (Tracking -)
FK+ (Focus +)
FK- (Focus -)
With the multimeter on diode test scale, measure the 4 laser coil pins to GND one time with the black probe on GND. Then again with the red probe on the GND.
With the black probe on GND it should measure something arround 1.800 on all 4 pins.
With the red probe on GND it should measure .650 on the 4 pins.
Testing the inverse, from Focus VCC pin put black probe on it (you can put the probe on the fuse close to the LA or BA chip.
With the black probe on Focus VCC it should measure something arround .750 on all 4 pins.
With the red probe on Focus VCC it should measure something arround 1.750 on the 4 pins.
These values are not absolute, they're aproximated.
Should any of the pins be open (PS2 can't read anything) or shorted (PS2 will burn the coils of a new laser if you replace it) the LA/BA chip must be replaced.
Remember that the laser unit must be disconnected from the motherboard for this test to be performed correctly.
SCPH-10000_GH-001 SCPH-15000_GH-003 SCPH-18000_GH-008 SCPH-30001_GH-005 SCPH-30000_GH-016(V4) SCPH-30001_GH-010(V4)
2xSCPH-10190, 2xSCPH-10350, 2xSCPH-10280
"**** j0 hackers!"
-Sjeep (As seen on TOXIC OS ELF...)