Marantz SUPERSCOPE CD-312 Service Data page 13

1. Head Azimuth Adjustment
SET UP
Power voltage:- 50 or 60Hz AC voltage rated
for the unit to be used in a market country.
TAPE selector switch position:- NORMAL.
Load:- Measuring instrument input im-
pedance.
Output terminal used:- LINE OUT.
Test tape used:- MTT-116U (31.5Hz . to
14kHz).
PROCEDURES
1.
3.
Play the 10kHz portion of the test tape
MTT-116U back. Adjust the head azimuth
adjusting screw for maximum VTVM read.
If the peak output reads of the right and left
channels are different, set the screws to
obtain the mechanical center between the
peaks.
After adjustment, lock the screw with bond.
Mode: playback
Tone [OKHz VTVM
iooKn Pe ket
Line Out
CAUTION
After adjustment, repeat the playback and
stop setting a few times to make certain of
no head azimuth deviation.
2. Tape Speed Adjustment
SET UP
1. Power voltage:- 50 or 60Hz AC voltage rated
for the unit to be used in a market country.
Output terminal:- LINE OUT.
Test tape used:- MTT-111.
Unit position:- Horizontal.
PROCEDURES
1. Play the mid portion of the test tape
MTT—111 back. Adjust the tape speed
adjusting semi-fixed resistor for 2990 to
3010Hz counter indication.
Mode: playback
Tone: 3kHz
FREQUENCY COUNTER
vag
See uP
CAUTIONS
For adjustment, the tape deck should be set
up in the normal operating condition.
Do not adjust the semi-fixed resistor more
turns than needed.
Do not proceed with adjustment after the
tape deck temperature has changed.
If a strong shock or similar vibration is
applied to the tape deck after adjustment,
make certain that the measured tape speed
had not changed.
If the tape speed deviation occurs, perform
the adjustment again.
Be careful that the counter may indicate a
wrong value because of too low counter
input level.
Before adjustment, allow for 30 seconds or
more after depressing of the PLAY push-
button.
12