Marantz SD555 - Adjusting the Electrical Sections

3. ADJUSTING THE ELECTRICAL SECTIONS
@ 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 (A-BEX TCC-112)
(A-BEX TCC-130, TCC-153, TCC-262B/162B)
(TDK AC-514)
(9) Transport Check cassette tape (A-BEX TCC-902)
(10) Lead line with alligator clip 3.
(1)
e Caution on adjusting
(1) Before adjusting, clean the head surface, capstan and the (2)
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
FORWARD
MODE MODE
REVERSE
Checking and Adjusting the Tape Speed
Connect the frequency counter to the LINE OUT terminal and
load test tape (A-BEX TCC-112)
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 about two sec-
onds, the Remote Control Indicator “I” in Display will light up
and the cassette deck will begin to play in speed adjustment
mode.
follows:
(Speed
adjustments
can
not
be
made,
unless
this
mode
is
first
O ENPUT
Volume
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maximum
selected.)
© DOLBY NR SWIth o....ceccccsssscsssssesssecssseeessecssseeaseesseesnes OFF (3) At first high speed adjustments, press the DUBBING SPEED
O BIAS volume .. Center click position “HIGH” button and use Meter Unit RT554 for Cassette Deck A
1. Tape Transport Check
Load the transport check cassette. in the operational mode,
iluminate the fixing guides of the R/P HEAD with a tamp 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).
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 Counter
LINE OUT
A-BEX TCC-112
(2) Playback the test tape; adjust the azimuth screw so that
section
A
of
the
resurge
wave
form
is
maximum
and
section
Mode
A/B
Tee
‘
‘i
B
is
minimum.
7
Normal
A
RT-553
3020+10
speed
B
|
RT-551
3010410
High
dir
a
|
RT-554
6030420
(eee
fe
B
RT-552
6020+20
A-BEX
TCC-153
PCS
87
612.
4
6 abu i AON a8 hh Ment EN AAR otS EON th np tte be Aten mrt enters Seti,
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