![ADJUSTING AND CHECKING THE[](/images/new-backgrounds/25710/2571017x1.webp)
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.
© | INPUT volume | maximum |
© | DOLBY NR switch | OFF |
© | TAPE SPEED volume | Center position |
3.Checking and Adjusting the Tape Speed
(1)Connect the frequency counter to the LINEOUT tern_inal and load test tape (SONY
(2)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.
F Counter
PB Amp
0UT3000 Hz +6Hz
SONY
,Adjusting the Playback and Recording Section
Procedure | Item | Usage tape | Response | Mode | Adjustment |
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| Adjustment | procedure |
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1 | PLAYBACK |
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| Fig. | PLAYBACK | (L) | Adjust | the LINEOUT | output to 775 | mV | |||
| GAIN | TCC- 130 |
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| (R) | (O dBs). |
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2 | P.B. |
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| Fig. | PLAYBACK |
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| Make | sure the playback characteristics | ||||
| Frequency | 262B |
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3 | REC/P.B. |
| Fig. | REC. PLAY | (L) | Record | 1 kHz and 10 kHz alternately. | ||||||
| Frequency | 1 kHz, | dB |
| _ | (R) | Adjust | each volume | so the 10 kHz |
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| 10 kHz, | dB |
| PLAYBACK |
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| playback | output is 0.5 dB in relation | to | |||
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| the 1 kHz playback output. |
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4 | REC GAIN |
| Fig. | REC. PLAY | (L) | Adjust | each volume | to the playback | output | ||||
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| 1 kHz, | dB |
| _ | (R) | is the | same as when | the recording | monitor | |||
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| PLAYBACK |
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5 | REC/P.B. |
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| Fig. | REC. PLAY |
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| Make | sure that the DOLBY NR C recording |
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 |
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to make sure the tape edge does not come in contact with the |
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tape guide section |
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| [] | ol,,_.___.......J | J |
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The tape transport is the most important element in determining | i°: |
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the performance of a cassette deck. |
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Avoid moving the various adjustment screws, nuts, etc., as much |
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as possible Refer to the pages on "Adjusting and Checking the |
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Mechanism Section" when replacing or adjusting the R/P HEAD |
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2.Adjusting the Azimuth
(1)After completing the tape transport check, load the test
tape
(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.
Fig, 3-1
OSCILLOSCOPE
; | / | PO,'DOLBYNR | / |
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| TAPE | PB/DOLBY NR | OUT | - |
RESURGE WAVE
O" | 30" | 90" | 135" | 180" |
OKNG
Frequency | Dolby NR C | _ | and playback characteristics conform to |
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| PLAYBACK | Figure |
| Playback | Frequency | Response |
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| Tape A.BEX | |||||
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| Record/Playback | Overall | Frequency | Response |
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(do) |
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| J_ | I | [ | _ | ] | II |
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_T | I ;;i',[ |
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| Dolby | NR | Off |
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| Dolby | C Record/Playback | Overall Frequency Response |
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.6_ |
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°t .... |
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I | I | lIII |
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20 |
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| IK |
| 2k |
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| Dolby | NR | On | C |
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| Level |
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Fig.