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ADJUSTING THE ELECTRICAL SECTIONS
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Measuring instruments necessary for adjust-
ments
(1)
Audio signal generator
(2)
Variable resistance attenuator
(3)
Electronic voltmeter
(4)
Oscilloscope
(5)
Frequency counter
(6)
Adjustment screwdriver
(7)
Trap coil adjustment square stick
(8)
Test tapes (SONY TY-224)
{A-BEX TCC-130, TCC-153, TCC-262B/162B)
(DENON GR-2/60)
(9)
Transport Check cassette tape (A-BEX TCC-902)
(10) Lead line with alligator clip
e Caution on adjusting
(1)
Before adjusting, clean the head surface, capstan and 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)
Untess
instructed
otherwise,
set the various controls as
follows:
O
INPUT Volume oo... cecesscscesecssccssssececseeceeneeees maximum
©
DOLBY NR SWitch occ
ceececescssesscsscensesscaeeessetaaee OFF
1. Tape Transport Check
Load the transport check cassette.
In the operational
mode,
illuminate 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).
(2) Playback the test tape; adjust the azimuth screw so that
section 4 of the resurge wave form is maximum and section
B is minimum.
A-BEX TCC-153
REVERSE
MODE
MODE
FORWARD
3.
Checking and Adjusting the Tape Speed
{1)
Connect the frequency counter to the LINE OUT terminal and
load test tape (SONY TY-224).
(2)
Load cassette tapes on both cassette decks A and B. Next, on
the deck (A or B) whose speed is to be adjusted, while holding
down
the PLAY,
FF and
REW
buttons
together,
press
the
POWER switch. After the power has been on for abouttwo sec-
onds, the Remote Control Indicator "Ml" in Display will fight up
and the cassette deck will begin to play in speed adjustment
mode.
(Speed adjustments can not be made, unless this mode
is first
selected.)
(3)
At first high speed adjustments,
press the DUBBING
SPEED
"HIGH" button and use Meter Unit RT554 for Cassette Deck A
and RT552 for Cassette Deck B.
Next normal speed adjustements, press the DUBBING
SPEED
"NORMAL" button and use Meter Unit RT553 for Cassette Deck
A and RT551 for Cassette Deck B.
(Note that speed adjustment mode is cancelled when the tape is
ejected.)
F. Count er
LINE OUT
DRW-580
#7
SONY TY-224
Mode
| A/B
Adjusting volume
F. couner
:
number
(Hz)
b
t
Normal |
A
RT-553
L
3020410
apeed:
|
RT-551
3010+10
High
A
RT-554
6030+ 0
i
speed
B
RT-552
602010
4
11
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