Sony DVP-NS300 Training Manual page 32
Circuit descriptions & troubleshooting
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Also See for DVP-NS300:
- Service manual (111 pages) ,
- Operating instructions manual (76 pages) ,
- Specifications (1 page)
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No Power
Several simple things can cause NO Power in this DVD player: Refer to Figure 6-2.
In-limit Sensor:
If a In-Limit sensor is defective, IC302 will cause the System Controller to shut off power.
Also, check the "INLIM" sensor signal to ARP. If there is no change in the voltage at Pin 166 of ARP (IC302),
check the "INLIM" sensor or flex cable continuity to the switch.
VCO Voltage:
The VCO voltage varies between 1.3 and 2.6 Volts. If outside of this range, the VCO is not operating and the unit
will shut down. Check this voltage after switching ON the set with a disc inserted.
Checking Laser Current
The laser diode is extremely sensitive to static electricity and should not be probed with test probes. Laser diode
current can be checked by determining the voltage drop on the emitter resistors of Q201 and converting it to
current using ohms law. See Figure 6-3.
Trouble Shooting Tips
No Power
Check VCO
At Pin 106
IC 302
Check limit
Switch Pin 166
Check Pin 106
While turning on off
No change?
Yes
IC 302 def
FIGURE 6-2 - NO POWER FLOW CHART
VCO 1.3 ~ 2.6 V
(Varies from model)
If '0' volt indicates no oscillation
CN202
IC302
GI00/INT2
ARP
166
INLIM
30
6. Troubleshooting
INLIM
7
Sensor
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Troubleshooting
