Fostex CR200 Service Manual page 22

Fostex cr200 cd recorder: supplementary guide

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CR200

4.2.6 Fine Focus Offset Adjustment

• Objective

• Symptom when out of adjustment

• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF) (SERVO UCOM BOARD assy)

• Disc

• Player state

• Adjustment location

[ Procedures ]

(1)

Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD or REV keys.

(2)

Press the FINALIZE key, the PLAY key and the PAUSE key in the order to close the respective servos and put the player

into play mode.

(3)

Adjust VR105 (FE. OFS) so that the 3T waveform at CN204, Pin-1 (RF) is maximum.

To optimize the DC offset voltage of the focus servo circuit.

The unit does not focus in, sound is caracking and the RF signal is dirty.

GND probe can be connected to CN204, Pin-4 (AGND).

[ Settings ]: 20 mV/div., 500 nS/div., AC mode

TCD-785

Test mode, play

VR105 (FE. OFS) (HEAD BOARD assy)

Out of adjustment

Optimum adjustment

Fig. 15

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