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1-3. Disc Selection Sequence
• During the aging mode, discs are selected in the following se-
quence:
Disc 1 → Disc 2
↑
Disc 2 ← Disc 1
2. Aging Mode in Tape Deck Section
2-1. Operating procedure of Aging Mode
1. Load a commercially available 10-minute tape into the decks
A and B respectively.
(If a 10-minute tape is not available, another tape may be
used but a cycle time will be longer.)
2. Select the function "TAPE".
3. Rewind tapes in advance by pressing 0 button respec-
tively on decks A and B.
4. Press three buttons NEXT , ENTER/NEXT , and
KARAOKE PON/MPX simultaneously.
5. Press · button on deck A. (This button triggers the aging
mode.)
6. The aging mode is activated if "AGING A" is displayed on
the fluorescent indicator tube.
7. In the aging mode, the aging is executed in a sequence given
in "2-2. Operation during Aging Mode".
The aging continues unless an alarm occurred.
8. To exit from the aging mode, press POWER button to turn
the set OFF.
2-2. Operation during Aging Mode
In the aging mode, the program is executed in the following se-
quence.
TE
L 13942296513
1. A tape on FWD side is played for one minute.
2. PAUSE STOP is made.
3. Recording is made for 3 minutes. (For the deck not having
the record function, the play is executed. In this case, ·
LED does not light up.)
4. FF is executed up to the end of tape.
5. A tape is reversed, and the tape on REV side is played for
one minute.
6. PAUSE STOP is made.
7. Recording is made for 3 minutes. (For the deck not having
the record function, the play is executed. In this case, ª
LED does not light up.)
8. FF is executed up to the end of tape.
9. Steps 1 through 8 are executed for the other deck.
10. Steps 1 through 9 are repeated unless an alarm occurred.
2-3. Deck Selection Sequence
• During the aging mode, decks are selected in the following se-
quence:
Deck A (FWD) → Deck A (REV)
Deck B (REV) ← Deck B (FWD)
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8
SELF-DIAGNOSIS
This model has the self-diagnosis function for the VIDEO and
AUDIO decoder sections.
Immediately after the power on, the self-diagnosis function searches
each operation of IC's around the mechanism control microcom-
puter (IC701).
The results can be checked by connecting an oscilloscope to TP709
(LED) of theVIDEO board.
Oscilloscope (Waveform)
1 time blinking
2 time blinking
3 time blinking
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3
6 7
1 3
Note: The LED for check (D701) is mounted to some sets
(FORMER TYPE). In this case, confirm the lighting condi-
tion of LED.
[VIDEO BOARD] (SIDE A)
D701
IC771
[VIDEO BOARD] (SIDE B)
u163
TP709 (LED)
.
IC751
— 5 —
2 9
9 4
2 8
H
No error
L
Light
H
External SRAM (IC751)
error
L
H
MPEG decoder (IC201)
error
L
H
DRAM (IC251) error
L
1 5
0 5
8
2 9
9 4
oscilloscope
VIDEO board
+
TP709 (LED)
–
m
co
X901
IC251
9 9
Symptom
2 8
9 9
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