Sony MZ-R50 Section Adjustments, Optical Pickup flexible board, Connection, Adjusting Method

SECTION 5

ADJUSTMENTS

5-1. Precautions for Laser Diode Emission Check

When checking the emission of the laser diode during adjustments, never view directly downwards as this may lead to blindness.

5-2. Precautions for Using Optical Pickup (KMS-280A)

As the laser diode inside the optical pickup damages by static elec- tricity easily, solder the laser tap of the flexible board when han- dling. Also take the necessary measures to prevent damages by static electricity. Handle the flexible board with care as it breaks easily

Laser tap

Optical Pickup flexible board

5-3. Precautions for Adjustment

1)Perform all adjustments in the order given in the test mode. After adjusting, exit the test mode.

2)Use the following tools and measuring instruments.

• CD test disc TDYS-1

(Parts Code : 4-963-646-01)

• Recorded MO disc PTDM-1

(Parts Code : J-2501-054-A)

• Laser power meter LPM-1

(Parts Code : J-2501-046-A)

•Oscilloscope (Frequency band above 40MHz. Perform the cali- bration of probe first before measuring.)

•Digital voltmeter

3)Unless specified othewise, supply DC 6V from the DC IN 6V jack.

4)Swtich, knob positions

Hold switch • • • • • • • • • • • • • • OFF• •

AVLS switch • • • • • • • • • • • • •NORM•

5-4. DD 2.8V Adjustment

Connection :

Digital voltmeter

POWER board

TP8507 (+2.8V)

TP8505 (AGND)

Adjusting Method :

1.Connect the digital voltmeter to test point TP8507 (+2.8V) and TP8505 (AGND) on power board.

2.Adjust the RV801 for 2.8V reading on the digital voltmeter.

Connection point and adjustment location : POWER board

[POWER BOARD]

(SIDE A)

RV801

[POWER BOARD]

(SIDE B)

TP8505

TP8505

(AGND)

TP8507	TP8507
(+2.8V)	TP8503

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