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1-4-3. Abnormality Analysis by Self-check
Function
The unit used V3 mechanism has a self-check function.
The self-check function works as a system which stored
some abnormal condition. So, use this function to try to
analyze the cause(s).
For the data display method and the content of the data,
refer to the self-check function (described on page 2-47)
in item 2-3,
Note:
« Abnormal data is displayed only when the first
abnormal condition occurs, and is not displayed in the
second time. Accordingly, the claim from customers
and the actual data displayed may be different.
¢ The data is stored only when the power turns off after
occurring the abnormality condition(s). The data is not
stored when the unit operation is recovered by the
microcomputer.
¢ After repairing, initialize the data by pressing the
[COUNTER RESET] button while displaying the
abnormal mode.
The typical examples in abnormal condition are shown
below.
Table 4-3-1
>
QO
Abnormal Condition
coy om
c WwW
playback the tape.
ca
My
C3
in
the tape.
eo man
playback the tape.
Ca ca ca
Lo
hat
=f
REVIEW the tape.
ta Ca C3
cou
Tu
me
ca
oO
a &
og
mo
Lug
co
uw
ca
Cylinder is stopped at playback position during
Cylinder is stopped at FF/REW position during rewind
T reel sensor is abnormal at playback postion during
S reel sensor is abnormal at playback position during
Cassette-in and out operation cannot be performed.
Mode shift cannot be performed during shifting to
REVIEW.
Check Item
Check the cylinder motor.
Check if the cylinder and tape transport guide
are clogged.
Check the capstan motor.
Refer to the cases 2 and 3 describe on the table
"Defective analyzing list".
Refer to the case 1 described on the tabie
"Defective analyzing list".
A: System control mode, B: Abnormality No., C: Mechanical position when an abnormality occurs.
1-4-4. Check by Defective Analyzing List
If the abnormality causes the mechanism abnormal condi-
tion, presume, confirm and treat the defective according
to the "Defective analyzing list" in table 4-4-1.
(1) Manual mechanism operation (mode shift) method
Push in the lock lever R and L manually and turn the
worm wheel counterclockwise as shown in Fig. 4-1-1.
The cam gear is turned clockwise and the mode shifts
to the direction where the loading operation can be
performed. So, check the mechanism condition in the
defective mechanism position when the abnormality
occurs,
(2) Defective parts replacement
When a defective occurs due to the defective part(s)
and the part(s) is replaced, take care the following
items.
* Especially as for the mechanical parts requiring the
phase alignment, take care of the part replacement
E.g.. Assembling mode, phase alignment mark and
etc,
* As for the part(s) requiring lubricant such as a
specified amount of oil or grease, apply grease or oil
according to the instructions and do not stick grease or
oil to the portions without allowing to stick it (espe-
cially in removal and assembly).
(3) Check after treating the defective
After replacing a defective part and/or aligning a part,
first check the mechanism operation manually and
confirm that no problem occurs, and then mount the
mechanical deck, turn the power ON and check the
mechanism operation.
Note:
¢ After replacing the defective parts according to the
procedure of the treatment method for the "damage
and phase shift of mechanical part", check the
operation of the mechanism again, since the same (or
similar) defective problem may occur due to other
serious cause (in mechanism or electrical circuit)
when performing the actual total check with turning
the power on.
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