Pioneer CT-F10 Manual de serviço - Página 22

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1. Block Diagram and Schematic Diagram

CT-F10

6.3 ADJUSTMENT

Please execute this adjustment in test mode .

Adjustment Condition

(1) The ground at the time of adjustment shall be W134.

(Refer to Fig. 6–4).

(2) Clean the heads and demagnetize them using a head eraser.

(3) Set the measurement level to 0 dBV = 1 Vrms.

(4) Use the specified tape for adjustment. Use the labeled (A) side

of the test tape.

NCT–111

: For Tape Speed Adjustment

: For Head Azimuth Adjustment

NCT–132X

: For Playback Level Adjustment

: For Playback Frequency Adjustment

STD–633

: Normal blank tape

STD–622

: CrO

blank tape

(5) Provide yourself with the following measuring devides:

• AC millivoltmeter

• Low-frequency oscillator

• Attenuator

• Oscilloscope

(6) Adjust both right and left channels unless otherwise specified.

(7) Turn the DOLBY NR switch off unless otherwize specified.

(8) Warm up the unit for several minutes before adjustment. In

particular, be sure to warm up the unit in the REC/PLAY mode

for 3 to 5 minutes before starting recording/playback frequency

characteristics adjustment.

(9) Always follow the indicated adjustment order.

Otherwise, a complete adjustment may not be achieved.

Dolby noise reduction manufactured under license from Dolby

Laboratories Licensing Corporation.

"DOLBY" and the double-D symbol are trademarks of Dolby

Laboratories Licensing Corporation.

Test Tape NCT-132X

0 dB

30s

0 dB: 315 Hz, 250 nwb/m

30 s

315 Hz

6.3 kHz

30 s

10s

10s .......................................................................................................... 10s

12.5

10 kHz

315 Hz

14 kHz

kHz

Fig. 6-3 Test Tape NCT-132X

List of Adjustment

¶ Playback Section

(1) Tape Speed No Adjustment (Confirmation)

(2) Head Azimuth Confirmation

(3) Playback Level Adjustment FWD

REV Confirmation

(4) Playback Frequency Characteristics Confirmation

¶ Recording Section

(1) Recording Bias Adjustment FWD

(2) Recording Bias Adjustment REV

(3) Recording Level Adjustment FWD

REV Confirmation

PLAY BACK

250

3dB

RECORDING

250

3dB

Fig. 6-2 Frequency Characteristics

6.3

10 kHz 8 kHz

4 kHz 2 kHz

1 kHz

kHz

12.5k

10k

3dB

4dB

12.5k

10k

5dB

3dB

–20 dB

500

250

125

63 Hz 40 Hz