Denon DN-730R User Manual download pdf (Page 9)

ADJUSTING AND CHECKING THE[

_ELECTRICAL SECT] _ON............

• Caution on adjusting

(1) Before adjusting, clean the head surface, capsta_l ,_r_d the

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.

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-_EX I _ _ ,,_ L-€.

TAPE| PB/DOLBY NR OUT -

Fig. 2-1

RESURGE WAVE

O" 30" 90" 135" 180"

OK NG

Fig. 2-2

(1)

(2)

Checking and Adjusting the Tape Speed

Connect the frequency counter to the LINEOUT tern_inal

and load test tape (SONY TY-224).

Playback a 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

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) (O dBs).

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! ....

50 _oo 200 SO0 t k 2= _ 10k _4_ 20_ {Mz)

Tape A.BEX TCC-262B/162B

Fig. 4-1

Record/Playback Overall Frequency Response

(do)

-I.

-2

-4

° _T I ;;i',[ _L___L_L_

-' _ _ !_J_! _ ! l_

20 50 ioo 200 _00

'' I ii ,"f..,. , I

_._J_._l i :ill ; ] I i

_[ I I illl ! I i 1

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 dB From Dolb¥ Level

Fig. 4-2

Dolby C Record/Playback Overall Frequency Response

till

IIII

lIII

__ _ 1 J

: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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 24 25

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Denon DN-730R User Manual Page 9

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