Major Waveform - LG FFH-171A Manual

MAJOR WAVEFORM

TRACKING ERROR(REW)
TRIG 1=1.0V
∆V1=0.00V
∆V2=0.00V
1
2
1V 1V
• Connection : 1. IC501 pin
2. IC501 pin
• Inspection : Check tracking servo
circuit.(RWD)
FOCUS GAIN
∆V1=0.000V TRIG 1=0.09V
3
0.5V
• Connection : 3. IC502 pin
• Test disc : YEDS-43
• Inspection : Confirm focus servo circuit.
∆T=0.00ms
SAVE
DLY>=0.85ms
PEAKDET 1ms 1ms
.(TEO)
54
50
∆T=0.00ms
SAVE
DLY>=4.25ms
PEAKDET 5ms 5ms
and .
1 2
TRACKING ERROR(FWD)
∆V1=0.00V
∆V2=0.00V
1
2
1V 1V
• Connection : 1. IC501 pin
• Inspection : Check tracking servo
TRACKING GAIN
∆V1=0.0%
4
>1V
• Connection : 3. IC502 pin
• Inspection : Confirm TRACK servo circuit.
- 11 -
TRIG 2=1.0V
∆T=0.00ms
SREF 2 A
DLY>=0.85ms
PEAKDET 1ms 1ms
.(TEO)
54
2. IC501 pin
50
circuit.(RWD)
TRIG 1=-82% ∆T=0.000s
SAVE
DLY>=0.170s
PEAKDET 0.2s 50ms
and
26 27
• Test disc: YEDS-43
.