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ADJUSTING AND CHECKING THE[
_ELECTRICAL SECT] _ON............
• Caution on adjusting
(1) Before adjusting, clean the head surface, capsta_l ,_r_dthe
pinch roller with a gauze or a cotton swab moistened with
alcohol.
(2) Demagnetize the R/P HEAD and the E. HEAD with a head
eraser.
(3) Completely demagnetize the adjustment screwdriver.
(4) Unless instructed otherwise, set the various controls as fol-
lows.
© INPUT volume ............................................................. maximum
© DOLBY NR switch ................................................................. OFF
© TAPE SPEED volume ......................................... Center position
1. Tape Transport Check
Load the transport check cassette In the operational mode, illu-
minate the fixing guides of the R/P HEAD with a lamp and check
to make sure the tape edge does not come in contact with the
tape guide section
The tape transport is the most important element in determining
the performance of a cassette deck.
Avoid moving the various adjustment screws, nuts, etc., as much
as possible Refer to the pages on "Adjusting and Checking the
Mechanism Section" when replacing or adjusting the R/P HEAD
2. Adjusting the Azimuth
(1) After completing the tape transport check, load the test
tape (A-BEX TCC-153). Fig. 2-1
(2) Playback the test tape; adjust the azimuth screw so that
section A of the resurge wave form is maximum and section
B is minimum. Fig. 2-2
OSCILLOSCOPE
; / PO,'DOLBYNR /
A-_EXI_ _ ,,_ L-€.
TAPE| PB/DOLBY NR OUT -
Fig. 2-1
RESURGE WAVE
O" 30" 90" 135" 180"
OK NG
Fig. 2-2
3.
(1)
(2)
Checking and Adjusting the Tape Speed
Connect the frequency counter to the LINEOUT tern_inal
and load test tape (SONY TY-224).
Playbacka test tape. At about halfway through the tape,
where the tape transport is stable, adjust the adjustment
points (RT305)on the P.W. BOARD (222 2778 ***) so that
the frequency counter will have a reading within the
range of 3,000 Hz +6 Hz.Fig. 3-1
PB Amp
0UT
SONY TY-224
F Counter
3000 Hz
+6Hz
r"
¢
i°: d i . |
i _ _ [] ol,,_.___J....... J
-" _ "APE
Fig, 3-1
,
DN-730R I
Adjusting the Playback and Recording
Section
Procedure Item Usage tape -- Response Mode Adjustment Adjustment procedure
input condition location
1 PLAYBACK A-BEX Fig. 4-1 PLAYBACK RT-101 (L) Adjust the LINEOUT output to 775 mV
GAIN TCC- 130 RT-201 (R) (OdBs).
2 P.B. A-BEX Fig. 4-1 PLAYBACK Make sure the playback characteristics
Frequency TCC-162B, 262B conform to Figure4-2.
3 REC/P.B. GR-2/60 Fig. 4-2 REC. PLAY RT-103 (L) Record 1 kHz and 10 kHz alternately.
Frequency 1 kHz, --40 dB _ RT-203 (R) Adjust each volume so the 10 kHz
10 kHz, --40 dB PLAYBACK playback output is 0.5 dB in relation to
the 1 kHz playback output.
4 REC GAIN GR-2/60 Fig. 4-2 REC. PLAY RT-108 (L) Adjust each volume to the playback output
1 kHz, --30 dB _ RT-208 (R) is the same as when the recording monitor
PLAYBACK is output.
5 REC/P.B. GR-2/60 Fig. 4-3 REC. PLAY Make sure that the DOLBY NR C recording
Frequency Dolby NR C _ and playback characteristics conform to
PLAYBACK Figure 4-3.
Playback Frequency Response
....... +r -4 - --_ ! i! ....
_6
20
50 _oo 200 SO0 tk 2= _ 10k _4_ 20_ {Mz)
Tape A.BEX TCC-262B/162B
Fig. 4-1
Record/Playback Overall Frequency Response
(do)
.6
.4
,z
.I
0
-I.
-2
-4
° _T I ;;i',[ _L___L_L_
-' _ _ !_J_! _ ! l_
20 50 ioo 200 _00
P
'' I ii ,"f..,. , I
_._J_._l i :ill ; ] I i
_[ I I illl ! I i 1
I,
I'
J_ I [ _ ] II
t!! ', !
k 2w 5_
.6_
.2---------+------i----
°t .... -+---_ _
-2
-,--- I I
-5--- I *
-is _ i
20 50
,-,,-" ---I
-- --4-------.I
Ta_ HD-TE_60
Dolby NR Off
Level -- 20 dBFrom Dolb¥ Level
Fig. 4-2
Dolby C Record/Playback Overall Frequency Response
till
IIII
lIII
__ _ 1 J
1
:I --•
........ __-- _--, ' 1 . Fig. 4-3
IK 2k 5k t0k 14k 20k(z)
Itlt
tOO 200 500
Tope HO-7E/60
Dolby NR On C
Level -- 20 dB From Dolby Level