Adjustment - Kenwood RD-VH7 Service Manual

RD-VH7
QQ
3 7 63 1515 0
CD section
NO. ITEM
TEST MODE : While pressing the PLAY/PAUSE key ,plug the power cord into the AC power wall output.
Insert TEST DISC.
LASER CURRENT
[1]
CHECK
FOCUS ERROR
[2]
BIAS
(Set up vertically)
FOCUS ERROR
[3]
BIAS
(Set up vertically)
FOCUS ERROR
[4]
BIAS
(Set up horizontally)
TE
L 13942296513
FOCUS ERROR
[5]
BIAS
(Set up horizontally)
Note:
• Type 4disc: SONY YDS-18 Test Disc or equivalent.
• This unit needs to be adjusted by Jitter meter.
• Keep the step of adjustment.
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.
14

ADJUSTMENT

INPUT
OUTPUT
SETTINGS
SETTINGS
Set the tester across
Test disc R502(1Ω) on the
type 4 PCB(X09:D/4) of CD
mechanism .
Connect an oscilloscope
and jitter meter as follows.
Test disc
CH1:RF(CN402:7pin)
type 4
CH2:FE1(CN402:6pin)
GND:VC(CN402:4pin)
Connect an oscilloscope
and jitter meter as follows.
Test disc
RF IN:RF(CN402:7pin)
type 4
CH2:FE1(CN402:6pin)
GND:VC(CN402:4pin)
Connect an oscilloscope
and jitter meter as follows.
Test disc
CH1:RF(CN402:7pin)
type 4
CH2:FE1(CN402:6pin)
GND:VC(CN402:4pin)
Connect an oscilloscope
and jitter meter as follows.
Test disc
RF IN:RF(CN402:7pin)
type 4
CH2:FE1(CN402:6pin)
GND:VC(CN402:4pin)
x ao
y
i
8
CD PLAYER
SETTINGS
Press the PLAY/PAUSE
key to check that the
display is 03 or05.
Press the PLAY/PAUSE
key . Confirm that the
display is 05.
Press the PLAY/PAUSE
key . Confirm that the
display is 05.
Press the PLAY/PAUSE
key . Confirm that the
display is 05.
Q Q
3 6 7 1 3
Press the PLAY/PAUSE
key . Confirm that the
display is 05.
u163
.
2 9 9 4 2 8
ALIGNMENT ALIGN FOR
- 50±20mA
FE BIAS
Optimum eye pattern
VR401
FE BIAS
Jitter level minimum
VR401
FE BIAS
Optimum eye pattern
VR400
1 5 0 5 8 2 9 9 4
FE BIAS
Jitter level minimum
VR400
m
co
9 9
FIG.
2 8 9 9