17
CDJ-2000NXS
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.2 FAILURE JUDGEMENT OF THE PICKUP ASSY
Measure the voltage at the probe pad on the SR
V
B Assy (see the photo below), using a tester.
∗
To check lighting of each LD, follow the procedure indicated in "[7] Checking the servo operations of the drive unit" in
"6.1
SER
V
ICE MODE."
∗
N
ote that the LD may be degraded if the probes of a tester are applied to or pulled away from the probe pad with the LD O
N
.
Check method
Directly measure the resistance value of the actuator, using a tester.
* Before measuring, short-circuit the LD short-circuit pads.
N
ote that the LD may be degraded if connection/disconnection of C
N
7001 is performed with the LD short-circuit pads open.
• Focus side
Disconnect* the FFC connected to the C
N
7001 then measure the resistance value between FFC pins 23 and 24.
• Tracking side
Disconnect* the FFC connected to the C
N
7001 then measure the resistance value between FFC pins 21 and 22.
Check method
1. With the LD OFF, apply the probes of a tester to the reference probe pad (LDCHK) and 7
8
CHK (CD side) or 65CHK
(D
V
D side).
2. With the probes kept applied to the above-mentioned pads, turn the LD O
N
to measure the voltage between them.
3. After measurement, turn the LD OFF (ALL OFF) then pull the probes away.
4. Calculate the current value by dividing the measured voltage value by the resistance value mentioned below.
(For CDs: R700
8
= 22 ohms, For D
V
Ds: R7007 = 12 ohms)
Procedures
If the calculated current value exceeds the maximum value, the LD has been degraded
Failure judgment:
A value out of the range of the specifications is judged as failure.
Failure judgment:
7
8
CHK
65CHK
IC7002
Fig.1 SR
V
B Assy
LDCHK
LD power after passing through the objective lens [mW]
SPEC: D
V
D 0.1
8
0 ± 0.03
CD 0.210 ± 0.03
Check method: Measure the LD power, using an optical power meter.
Failure judgment: A value out of the range of the specifications is judged as failure.
Actuator resistance value [ohms]
Specifications on the focus side: 3.7 ±0.55
Specifications on the tracking side: 4.3 ±0.65
LD current [mA]
SPEC: D
V
D TYP50 MAX70
CD TYP65 MAX75
This unit has self-diagnostic functions for the drives.
For drive-related malfunctions, first perform the self-diagnostics to check the drives in Service mode. If the results indicate any
problem with the drives, check the following items:
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