Power Adjustment; Q Q - Pioneer DVR-104 Service Manual

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6.2.3 Power Adjustment

QQ
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Before adjustment, turn VR1 and VR2 (periphery of CN101) fully counterclockwise to set their laser power output to
A minimum.
(1) DVD Power Adjustment
• Set the wavelength of the light power meter to 660 nm, and shine the sensor to the objective lens.
(1.1) Playback Power Adjustment
Objective
Symptom when out
of adjustment
Measurement Instru-
B
ment connections
Adjustment standard
value
[Procedure]
"5DT" (Selects 4.7R mode)
"LD" (LD ON)
Adjust VR1 so that the indication of light power meter becomes 1.03 ± 0.03mW.
"LD" (LD OFF)
C
Note: When confirm the output power once again after the Playback Power Adjustment, if indication of the light power
meter is limit of 1.03 ± 0.06mW, ther is not a problem.
TE
L 13942296513
(1.2) Recording Power Adjustment
Objective
D
Symptom when out
of adjustment
Measurement Instru-
ment connections
Adjustment standard
value
[Procedure]
E
[Write Power Low Adjustment]
"1AW"
Adjust with UP/DN command so that the indication of light power meter becomes 5.34 ± 0.2mW. (When enters the
"5UP/5DN", it can send every 5 step.)
"EE" (Store the adjustment value in the nonvolatile memory)
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To optimize the playback power of laser diode (LD).
When a gap is terrible : Player does not playback, track search is impossible
When a gap is light : RF waveform is dirty.
Shine the light emitted from the objective
lens on the light power meter sensor.
Wavelength 660nm Ave. mode
Wavelength 660nm,
1.03 ± 0.03mW (Ave.)
To optimize the Recording power of laser diode (LD).
When a gap is terrible : Player does not playback, track search is impossible
When a gap is light : RF waveform is dirty.
Shine the light emitted from the objective
lens on the light power meter sensor.
Wavelength 660nm Ave. mode
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y
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Player state
Adjustment
location
Disc

Q Q

3 6 7 1 3
Player state
Adjustment
location
Disc
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.
DVR-104
3
4
2 9 9 4 2 8
STOP
VR1
None needed
1 5 0 5 8 2 9 9 4
STOP
Set the value with the command
None needed
m
co
4
9 9
2 8 9 9