Marantz SD1010 - Page 12

6.
ELECTRICAL ADJUSTMENTS
Precautions before Adjustment
1.
6.
7.
Before playing the test tape back, thoroughly
demagnetize the heads, capstan and similar metal
parts using an eraser as the test tape-recorded tone
is easily erased.
. Do not place the test tape on any measuring instru-
ment.
. Do not put the test tape near a place where the
eraser is used.
. Method of Demagnetization: — Turn the eraser
power switch on at a remote position far away from
the heads. Bring the eraser close to the heads,
capstan and other parts to be demagnetized, and
move it up and down four or five times to demag-
netize. Slowly separate the eraser far away from the
parts, and turn the power switch off.
. Do not use any magnetized adjusting tool. When
using it, demagnetize it from time to time in the
course of each adjustment.
Do not turn semi-fixed resistor more than needed.
Do not apply locking bond excessively.
Definitions
1.
The “normal playback state’’ is an operating state
of the tape deck which plays back the MTT-150
test tape and is adjusted so as to produce a 580mV
output at the LINE OUTPUT terminal with the load
assuming the measuring instrument input impedance
of greater than 100 kQ2Q and with the TAPE SELEC-
TOR switch set at the NORMAL position.
. The “normal recording state’ is an operating state
of the tape deck which records a 1 kHz signal to a
specified recording level for which the recording
level control is adjusted with the 1kHz signal
applied at a specified input level to the MIC termi-
nal.
In the normal recording state, therefore, this tape
deck is set up with the level control to the state
that the Peak Level Displays may illuminate to the
0 VU with a 1 kHz, 1 mV input signal applied.
11
6.1 HEAD AZIMUTH ADJUSTMENT
SET UP
1. Power voltage:- 50 or 60 Hz AC voltage rated for
the unit to be used in a market country.
. TAPE SELECTOR switch position:- NORMAL.
. Load:- Measuring instrument input impedance.
. Output terminal used:- LINE OUTPUT.
. Test tape used:- MTT-215M (315 Hz to 12.5 kHz).
. Tape Speed:- 1-7/8 IPS.
PROCEDURES
1. Play the 315 Hz and 12.5 kHz portions of the test
tape MTT-115C back. Adjust the head azimuth
adjusting screw for maximum VTVM read.
. If the peak output reads of the right and left chan-
nels are different, set the screws to obtain the
mechanical center between the peaks.
3. After adjustment, lock the screw with bond.
Mode: Playback
TONE: 315 Hz,
12.5 kHz
LINE OUTPUT
CAUTION
After adjustment, repeat the playback and stop setting
a few times to make certain of no head izimuth
deviation.