3-20
No. Item
Measuring
instruments &
Input signals
Mode
Measuring point
(*)
Adjustment parts
(-)
Adjustment level
(+)
Adjustment procedure
3
PB EQ
(Error rate)
adjustment
• Internal color
bars (100%)
• PC
• REC
↓
PB
•
VITERBI : OFF
*
PC monitor
-
68 h, 69h, 67h, 6Bh,
63h, 64h
+ Minimize error rate
(Total less than
1000, and less than
500 at each chan-
nels )
Notes: • Use a new tape or non-used section of
tape in this adjustment.
• Be sure to clean the head before this ad-
justment.
• It takes about 1 second from the data
change to its reflection in the error rate.
• Also measure the error rate after the
“Sync Block” monitor has become per-
fectly OK.
• If the adjustment within specification is
not possible, clean the head. If the next
adjustment is still out of specification, use
another tape.
(1) Click [PB EQ (Error rate)].
(2) Click the [OK] button.
(3) Adjust “New value” of each address to mini-
mize the error rate, by following the order
shown in the flow chart.
(4) After adjustment, click the “v” marking and set
the power button of the set to OFF.
Start
End
Error Timing : 68h
Slice Level : 69h
1 + D Delay : 67h
PLL Phase : 6Bh
α : 63h
Error Timing : 68h
β : 64h
α : 63h
Error Timing : 68h
Error Rate Check
START
END
OK
NG
NG
NG
NG
2.4.3 Head cleaning
Is error rate within
specification?
2.4.3 Head cleaning
Replace tape.
2.12 Interchangeability Adjustment
END
OK
Is error rate within
specification?
END
OK
Is error rate within
specification?
END
OK
Is error rate within
specification?
Drum failer or
RF circuit failer
To START
3-19
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