2-9
2.4.4 Phase of control head (X value)
1. Connect the jig connector cable to CN25 on the MAIN
board.
2. Playback the SP stairstep signal of the alignment tape
and observe signal at V.TP FM with external trigger from
V.FF on the jig connector cable.
3. Operate the tracking button in the center and manual
tracking mode by pressing the tracking (+) and (–) but-
tons and confirm that the FM output level is maximum at
the center position as shown in Fig. 2-4-8.
4. If necessary, slightly loosen the setscrews
D
and
E
and
insert the Tweezers into the notch and guide hole to
move the A/C head fully in the direction of the capstan
to the extent.
5. Gradually move the A/C head toward the drum to find
the position where the FM output level maximum for the
first time (a’ – b’ in Fig. 2-4-8).
6. Fine adjust the phase of the A/C head and tighten the
screws
D
and
E
at the point a.
Fig. 2-4-7 Phase of control head
Fig. 2-4-8 Phase adjustment point of control head
A/C head
Insert the
Tweezers
Screw E
Screw D
A/C head phase
Direction of drum
Zero
Direction of capstan
FM output
a
b
Adjusting
point
Max
Table 2-5-1 Specific oil and grease to be used
2.5 REMARKS
2.5.1 Cleaning
1. For cleaning of the upper drum (particularly video
heads), use fine-woven cotton cloth or Kimwipe with al-
cohol soaks through. Do not move the cloth but turn the
upper drum counterclockwise.
Note: Make sure not to move the cloth in the vertical di-
rection to the video head, since it may cause damage
of the video heads.
2. For cleaning of parts of the tape transport system ex-
cept the upper drum, use fine-woven cotton cloth or cot-
ton swab soaked alcohol.
3. After cleaning, confirm that the cleaned parts are com-
pletely dry before loading the deck with cassette tape.
2.5.2 Applying oil and grease
1. Periodical oiling and greasing are not required but should
be done to new parts when replacing. If oil and grease
on the other parts of the other party are old and dirty,
wipe them clean and apply new oil or grease.
2. For parts and points to apply oil and grease, refer to the
exploded view of the mechanism assembly (M3).
Table 2-5-1pecifies oil and grease to be used.
3. When oiling, clean the objective parts with alcohol first
and apply one or two drop(s) of oil. Too much oiling
causes rotary parts to slip because of oil leakage.
Grease
KYODO-SH-P
AA
Oil
YTU94027
BB
Classification
Name
Symbol in drawing
2.5.3 Checkup
After replacement of the supply reel disk and tension band,
make sure to inspect back tension according to the adjust-
ment procedure of MECHANISM ADJUSTMENT section.
