(7) By operating the tracking button (both in + and - directions)4.3.4 A/C head height & azimuth
in the manual tracking mode, vary the output level of theRemove the exterior parts attached to the UPPER CASE
FM waveform from maximum to minimum and vice versa toASSEMBLY so that the screws around the A/C HEAD
confirm that the waveform varies nearly in a flat shape.ASSEMBLY can be tighten or loosen.
(8) When the FM waveform breaks in the level varying process,? CASE COVER(M) ASSEMBLY
subtly adjust the height of guide rollers at every breaking? LOWER CASE ASSEMBLY
point so that the waveform varies as flat as possible. ? TOP COVER ASSEMBLY
Repeat the above steps 6. and 7. several times to confirm? UPPER CASE(M) ASSEMBLY
that the waveform is flat as a whole.? FRONT FRAME ASSEMBLY
(9) Playback the SP stairstep signal of alighment tape and ad-
NOTE:
just the tracking control to maximize the FM waveform,
In performing adjustment, it is recommended that LOWER
confirm that FM waveform variation is always flat.
CASE ASSEMBLY and TOP OPE UNIT are attached to the
(10) Record the signal and play it back in both of the SP and EP
main body for better operation and safety.
modes, and confirm that the FM waveform is flat in both
(1) Remove the Cover (JIG) shown on Fig.4-2-1.
modes.
(2) Connect the JIG CONNECTOR CABLE to CN25 on the
NOTE:MAIN BOARD ASSEMBLY.
Among the above-mentioned adjustment steps, the(3) Connect the channel-1 scope probe to the audio output
items of No.9 and No.10 are needed for the EP model(AO_SIG_J) and connect the channel-2 scope probe to PB
only.CTL.
(4) Playback the alignment tape.
(5) Set the tracking to its center range by pressing the (+) and
CH-2
(-) tracking controls simultaneously.
1 field(6) Adjust screws[ A ], [B] and [C] approximately 45 degrees
in the same direction to obtain maximum audio output and
CTL signal levels.
FLATTEN WAVEFORM.(7) As a final fine adjustment, adjust screw [B] for minimum
signal level fluctuation and screw [C] for maximum output
signal level.
CAUSER BY WRONG HEIGHT
CAUSED BY WRONG HEIGHT
OF SUPPLY GUIDE ROLLER
OF TAKE-UP GUIDE ROLLER
Fig.4-3-5
A/C HEAD
SCREW [C]
CORRECT VARIATION OF WAVEFORM
BAD VARIATION OF WAVEFORM
SCREW [A]
SCREW [B]
Fig.4-3-6
(11) Through the above steps, confirm that there occur no wrin-Fig.4-3-7
kling and damage in the tape around the PINCH ROLLER
and TU GUIDE POLE whenever the deck is in operation of
Loading/Unloading, Search Rewind and at mode change
from Search Rewind to play mode. If wrinkling or damage
in the tape occurs around the TU GUIDE POLE, adjust theAudio
angle (slant) of the A/C HEAD to the tape. So that the tapesignal
normally runs along the lower flange of the GUIDE POLE.
Control
pulse
signal
Fig.4-3-8
1-20 (No.YF073) |
ACEC
