Pioneer CT-F10 Service Manual page 22

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
2
(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
22
30 s 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
Hz Hz Hz