Recording Section - Pioneer IS-21T Service Manual

XC-IS21T
6.1.2 Playback Section
(1) Tape Speed Confirmation
No. Mode Input Signal/Test Tape
1 PLAY NCT-111 (3 kHz)
(2) Head Azimuth Adjustment
¶ This unit is equipped with auto tape selector.
¶ Do not switch between forward and reverse operation with the screwdriver inserted.
No. Mode Input Signal/Test Tape
STD-331E test tape
1 PLAY
(Playback: 10 kHz, –20 dB)
(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)

6.1.3 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 signal to the LINE -
1
PAUSE IN terminal.
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 IN terminal.
REC =
STD–632 test tape and record/
2
playback the 315Hz signal.
PLAY
52
Adjustment Points Measurement Points
VR2701 (DECK ASSY) TP R (C2204)
(Refer to Fig. 6-3) (DECK ASSY)
Measurement
Adjustment Points
Head azimuth TP L (C2203)
adjustment Screw TP R (C2204)
(Refer to Fig. 6-3) (DECK ASSY)
Measurement
Adjustment Points
VR2301
TP L (C2203)
L ch
TP R (C2204)
VR2302
R ch (DECK ASSY)
Adjustment Points
Input signal level
VR2801
L ch
VR2802
R ch
Adjustment Points
Input signal level
VR2401
L ch
VR2402
R ch
Adjustment Value
+10
3000 Hz
–10
Adjustment
Points Value
Max. Playback
signal level
Adjustment
Points Value
–3.7 dBV
Measurement
Adjustment
Points
Value
–23.7 dBV
TP L (C2203)
TP R (C2204)
Repeat adjustment until playback level of
(DECK ASSY)
the 10kHz signal is within 0.5dBV ±0.5dB
from that of the 315Hz signal.
Measurement Adjustment
Points Value
–7.7 dBV
TP L (C2203)
TP R (C2204)
Repeat recording, playback and
(DECK ASSY)
adjustment until playback level of the
315Hz signal becomes –7.7dBV±0.5dB.
Remarks
FWD adjustment
Hz
REV Confirmation
+60
( 3000 Hz Hz )
–60
Remarks
After adjustment, apply silicon
bond to the head azimuth
adjustment screw.
Remarks
Remarks
Remarks