KENWOOD DPSG7G
Service Manual

DP-SG7/SG7G
ADJUSTMENT
No. ITEM INPUT SETTINGS OUTPUT SETTINGS PLAYER SETTINGS ALIGNMENT POINTS ALIGN FOR FIG.

While pressing the "REPEAT" key, turn the AC ON. { Refer to test mode (MODE 0 0) } On the power from 0.08 to 0.15 mW, when the diffraction grating is correctly aligned with the RF level of 0.6 Vp-p or more.

1

LASER POWER

�

Apply the sensor section of optical power meter on the pickup lens.

Press the PLAY/PAUSE key, then confirm that the LED is "03".

�

(a)

2

FOCUS ERROR BIAS

Test disc Type 4

Connect an oscilloscope as follows. CH1 : RF (CN3 pin 1) CH2 : TE (CN3 pin 6)

Press the PLAY/PAUSE key, then confirm that the LED is "05".

FE BIAS VR2

Optimum eye pattern

3

TRACKING ERROR BALANCE

Test disc Type 4

Connect an oscilloscope as follows. CH1 : RF (CN3 pin 1) CH2 : TE (CN3 pin 6)

Press the PLAY/PAUSE key, then confirm that the LED is "03".

TE BALANCE VR1

Symmetry between upper and lower patterns

4

TRACKING GAIN

Test disc Type 4 Connect a LPF to CN3 Apply signal of pin 5-6 to which you 1.2 kHz, connect an oscilloscope 50mVrms to or AC voltmeters. CN3 pin 5-6.

Press the PLAY/PAUSE key, then confirm that the LED is "05".

TRACKING GAIN VR3

Two VTVMs should read the same value.

(e)

Note: Type 4 disc : SONY YEDS-18 Test Disc or equivalent.(KTD-0V) LPF: Around 47 k�+ 390 pF or so. Step 1~4 are in Test Mode.

(a) Laser power
0.08 0.15 mW

(e) Tracking gain
CN3
1 2 3 RF FE1 FE2 VC TE2 TE1

VC L.P.F. L.P.F. + + VTVM VTVM

_
1.2 kHz 50 mVrms

4 5 6

+

Pickup

Optical power meter

7 S.S

ALIGNMENT POINTS

CN1

T-GAIN

TE-B

FE-B

VR3

VR1

VR2

4