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9-6. Error Rate
This check is required to check if adjustment is correctly adjusted, using the test tape TY-7551.
[Checkpoints]
Oscilloscope Channel 1 — Test pad F1ER (pin 90 of HD62004)
Oscilloscope Channel 2 — Test pad PBO
Oscilloscope's External Trigger — Testpoint PG
Also connect a frequency counter on Testpoint FiER
[Checking Method]
(1) Track No. 13 of test tape TY-7551.
(2) The frequency counter's reading is under 96 Hz.
(3) Observing the oscilloscope screen make sure that no C2 Error occurs at muted area onthe tape.
(4) Ifthe adjusted value is off the specified value, adjust 1 to 4 again. If still the same it could be PCB
faulty.
on the tape.
FIER
HELL
Ltt
|
One pulse appears on F1ER terminal per one error
before the adjustment.
PG
ee
ee ee a
47
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