Pioneer CT-IS21 Service Manual page 29

(3) Playback Level Adjustment
• Since this adjustment determines playback DolbyNR level, Perform it carefully.
No. Mode Input Signal/Test Tape
STD-331E test tape
1 PLAY
(Playback: 315 Hz, 0 dB)
(4) Playback Frequency Characteristics Confirmation
No. Mode Input Signal/Test Tape
1 PLAY STD-331E test tape
6.2.2 Recording Section
(1) Recording Bias Adjustment
• After the adjustment, caution should be exercised so as not to become under bias by checking the distortion rate.
No. Mode Input Signal/Test Tape
REC/ Input a 315Hz (–26 dBV) signal to
1
PAUSE the LINE INPUT.
Load the STD–632 test tape and
REC =
2 record/playback the 315Hz and
PLAY
10kHz signals. (see the Note below)
Note: Set the 10kHz input signal level to the same value as the 315Hz input signal level of step 1.
(2) Recording Level Adjustment
No. Mode Input Signal/Test Tape
REC/ Input a 315Hz signal to the LINE
1
PAUSE INPUT.
• STD–632 test tape and record/
REC =
2
playback the 315Hz signal.
PLAY
• DOLBY NR : OFF
(3) Recording Frequency Characteristics Confirmation
No. Mode Input Signal/Test Tape
• STD–632, STD-622 test tape
REC =
• Record with –26.0 dBV
1
PLAY
• DOLBY NR : ON/OFF
Note : Impedance of LINE IN/OUT are as follows :
• LINE IN : 53 kΩ
• LINE OUT : 2 kΩ
Measurement
Adjustment Points
Points
VR2301
LINE OUT
L ch
(L, R ch)
VR2302
R ch (AF Assy)
Measurement
Adjustment Points
Points
LINE OUT
(L, R ch)
(AF Assy)
Adjustment Points
VR2801
L ch
VR2802
R ch
Adjustment Points
Input signal level
VR2401
L ch
VR2402
R ch
Measurement
Adjustment Points
Points
LINE OUT
(L, R ch)
(AF Assy)
Adjustment
Value
–6.0 dBV
Adjustment
Value
Check that the frequency
characteristics is within the
range of Fig. 6-2.
Measurement
Adjustment
Points Value
–26 dBV
LINE OUT
(L, R ch)
Repeat adjustment until playback level of
(AF Assy)
the 10kHz signal is within 0dB ± 0.5dB
from that of the 315Hz signal.
Measurement Adjustment
Points Value
–10 dBV
LINE OUT
(L, R ch)
Repeat recording, playback and
(AF Assy)
adjustment until playback level of the
315Hz signal becomes –10dBV ± 0.5dB.
Adjustment
Value
Check that the frequency
characteristics is within the
range of Fig. 6-2.
CT-IS21
Remarks
Remarks
Remarks
Remarks
Remarks
29