Kenwood DP-R3070 Service Manual page 11

TRACKING GAIN
3 FOCUS ERROR
4
ae"
~ DP-R3070/R4070R5O70
ADJUSTMENT
INPUT SET-
No. ITEM TINGS OUTPUT SETTINGS SETTINGS
~ Remove the clamper ass'y before step 1. And remount it after step 1.
With pressing the
P.MODE key, turn the
Set the sesor section of | power on to enter the
1 LASER POWER the optical power meter | test mode. Press the
on the pickup lens. CHECK key to check
that the display is
"03".
Cancel test mode and open the tray to load the disc.
Load disc and set to
test mode.
Confirm the display
is "03".
Connect an oscilloscope
as follows.
CH1:RF (CN3-1)
CH2:TE (CN3-6)
Test disc
Type 4
TRACKING ERROR
Connect an oscilloscope
as follows.
CH1:RF (CN3-1)
CH2:TE (CN3-6)
Press the PLAY key.
Confirm that the dis-
play is "05".
Test disc
Type 4
Test disc
Type 4 Connect a LPF to CN3
Apply signal of} pin 2-3 to which connect
Press the PLAY key.
Confirm that the dis-
FOCUS GAIN
Test disc
Type 4 Connect a LPF to CN3
Apply signal of} pin 5-6 to which connect
Press the PLAY key.
1.2 kHz, an oscilloscope or AC eae eel dis-
50mVrms to
voltmeters.
pray
CN3 pin 5-6.
Note:
Type 4 disc : SONY YDS-18 Test Disc or equivalent.
LPF: Around 47 k Q+390 pF or so.
Step 1~5 are in Test Mode.
(a) Laser power (e) Focus Gain, Tracking Gain
Focus gain
0.08 ~0.15 mW
1.0 kHz
comeaasnia 50 mV
—
Caaase
Pickup
Optical power meter
Tracking gain CN3
TE BALANCE
FE BALANCE
FOCUS GAIN
TRACKING
GAIN
POINTS
On the power from
0.08 to 0.15 mW,
when the diffraction
_ grating is correctly; (a)
aligned with the RF
level of 1.0Vp-p or
more.
Symmetry between
upper and lower or
DC=VC +0.025V
VR4 (c)
(d)
VRi Optimum eye pattern
Two VTVMs should
read the same value.
VR2 (e)
Two VTVMs should
VR3 read the same value.
2 pwsec/ div
20 msec / div
eer ne ee = ee
DP-R3070/R4070/R5070
ADJUSTMENT
e RF signal and E. Spot signal in test mode (PLAY).
CH1 RF if the diffraction grating has been adjusted properly, the
0.5V/div influence of triggering is observed on the E. Spot wave-
form of approx. 18 us after RF signal, in the form of a pro-
jection.
"@-VREF : 2.1 V
CH2 E. Spot
0.2 V/div
; projection
@ RF signal and T. Error signal in test mode (Focusing ON).
(Disc Type 4)
"@ VREF:2.1V
CH2 T. Error
0.2 V/div
@ RF signal in test mode (PLAY).
@ Perform the tangential and focusing offset adjistrments so
that each of the center cross points are focuied into one
point on the display. The crossing pointsabove and
below the center shall also be displayed cleary.
RF signal
0.5 V/div
10
.
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