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(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
Note:
MEASUREMENT
INSTRUMENTS
Audio Generator (20 Hz — 200 kHz)
AC Millivolt Meter (with dB measures)
Oscilloscope (DC — 5 MHz)
Distortion Meter
Speed & Wow/Flutter Meter
Frequency Counter (DC — 1 MHz)
Ohm Meter
DC Volt Meter
AC Volt Meter
Torque Gauge (DA09013A)
15 kHz Azimuth Tape (DA09004A)
3 kHz Speed & Wow/Flutter Tape (DAQ9006A)
1 kHz Track Alignment Tape (DA09007A)
400 Hz Level Tape (DAO9005A)
20 kHz PB Frequency Response Tape (DA09001A)
15 kHz PB Frequency Response Tape (DA09002A)
10 kHz PB Frequency Response Tape (DA09003A)
Reference EXII Tape (DAO9066A)
Reference SX Tape (DAQ9025A)
Reference ZX Tape (DA09037A)
Tilt Check Gauge M-9036 (DA09036A)
Stroke Check Gauge M-9038 (DA09038A)
EH Tilt Check Gauge M-9040 (DA09040A)
EH Stroke Check Gauge M-9051 (DA09051A)
Back Tension Gauge (DAO9055A)
Tension Arm Adjustment Cassette (DAOQ9056A)
Audio Analyzer T-100
(including Distortion, Wow/Flutter, Speed, Oscillator
and dB meters)
(10) — (27) are the products of Nakamichi
Corporation.
"nN
"
Mechanism
5
Chassis
X
Pointer
Fig. 4.1
VR6O2
R606
15K
@\
(Stop)
VR6OI
10K
Cam Control!
(Play)
Volume
a
L————
to Control
Motor
Fig. 4.2
11
4.
MECHANICAL ADJUSTMENTS
4.1.
Mechanism Control Cam Adjustment
Before
adjustment,
disassemble
the
Front
Panel
Ass'y
then remove the Cover Plate Ass'y referring to items 2.4
and 2.14.
(1) Offset Adjustment of Control Motor Driver
(a)
Refer to Figs. 4.1 and 4.2.
Adjust
VR602
and VR603
on the Control
P.C.B.
Ass'y to locate approximately
at the middle of the
variable range. Then turn ON the Power switch.
VR602 (for cam position stop)
VR603 (for cam position play)
Press
the Stop button
to set the N-480Z
in Stop
mode. Adjust VR602
(for stop) so that the '"S'' mark
on
the
Cam
corresponds
to
the
pointer
on
the
mechanism chassis.
Press the Play button to set the N-480Z in Playback
mode.
(Cam will rotate, and the position marked with "PY"
comes to the pointer.)
Adjust VR603
(for play) so that the "'PY" mark on
the Cam corresponds to the pointer.
Repeat above (b) and (c) 2 — 3 times so that the "'S""
and
"PY''
marks
on
the Cam
correspond
to the
pointer
accurately
in Stop
and
Playback
modes
respectively.
(This adjustment
is required
because
the position
adjusted by one volume will be slightly changed when
the other volume is adjusted.)
Set the N-480Z
in F.F., Pause, or Record mode by
pressing each
button
and check
to insure that the
pointer is in a range
of "F", "PS", or "R" mark
respectively.
If out of the range, precise adjustment for each posi-
tion
according
to (2)
Offset
Fine Adjustment
of
Control Motor Driver' will be required.
(b)
(d)
{e)
(f)
(2) Offset Fine Adjustment of Control Motor Driver
Adjust only if a satisfactory result is not obtained in ''(1)
Offset Adjustment of Control Motor Driver". This adjust-
ment is made by changing the value of the fixed resistors
on the Logic P.C.B. Ass'y.
Note:
The value of voltage is typical value.
(a) Observation Point of Reference Voltage
Observe the each voltage at the sliding contact of the
Cam Control
Volume
VR601
(10 kQ) in Stop, Fast
(F.F. or Rew.), Pause, Record and Playback modes.
Note:
When
Record and Play buttons are pressed to
set the N-480Z
in Record mode, the Cam is
first set to the
record
position
in a short
period of time then stays at the play position.
Therefore
to keep the Cam
at the
record
position,
following
procedure
is required:
Short
both
leads of capacitor
C417
(2.2
BF)
on
the
Logic P.C.B. with
a jumper
wire,
then
press
the
Record
and
Play
buttons.
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