Adjustment; Deck Section - Pioneer IS-21T Service Manual

Cd tuner deck
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6. ADJUSTMENT

For adjustment, use the stereo power amplifier (M-IS21).

6.1 DECK SECTION

6.1.1 Adjustment Condition
(1) The ground at the time of adjustment shall be W166.
(Refer to Fig. 6–3).
(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
STD-331E : For Playback adjustment
STD–632
: Normal blank tape
* As the reference recording level is 250 nwb/m for STD–
331E, the recording level will be higher by 4 dB for STD–
331B (160nwb/m). When adjusting, pay carefull attention
to the type of tape used.
(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.
0 dB
30s
0 dB: 315 Hz, 250 nwb/m
30 s
315 Hz
6.3 kHz
30 s
30 s
10s
10s .......................................................................................................... 10s
12.5
10 kHz
315 Hz
14 kHz
kHz
Fig. 6-2 Test Tape STD– 331E
7 List of Adjustments
¶ Playback Section
(1) Tape Speed Confirmation
(2) Head Azimuth Adjustment
(3) Playback Level Adjustment
¶ Recording Section
(1) Recording Bias Adjustment
(2) Recording Level Adjustment
PLAY BACK
250
3dB
RECORDING
250
3dB
Fig. 6-1 Frequency Characteristics
Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.
6.3
10 kHz 8 kHz
4 kHz 2 kHz
1 kHz
kHz
XC-IS21T
12.5k
10k
3dB
4dB
12.5k
10k
5dB
3dB
–20 dB
500
250
125
63 Hz 40 Hz
Hz
Hz
Hz
51

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