Table of Contents
Advertisement
Fe-Cr TAPE
7.
To measure erase efficiency, a 1 kHz
narrow bandpass filter should be used.
The test signal delivered from the AF
oscillator should be tuned to the filter
used.
CrO, TAPE
1.
2.
CONNECTION
NOTE
Load a TEAC
MTT-505TB
test
tape.
Apply and record a 1 kHz signal
at +5 dB
(1.37 V) for several
seconds,
.........+-0+-
(1)
Rewind the tape to the mid-point
of the recording and remove the
signal from the LINE IN jacks.
Place the deck in the record mode
and record through this previously
recorded
portion with no input
signal applied.
.......... (3)
Rewind the tape to the starting
point of the 1 kHz signal recorded
portion.
Play the tape and read the indica-
tion on the VIVM to obtain the
output level of both the unerased
portion and the erased portion of
(2)
the recorded section.
...... (5)
Measure
the output level differ-
ences between the 2 portions.
record
(3)
Specification: 65 dB (minimum)
Fe-Cr & Hi-Fi TAPES
The erase efficiency checks for these
tapes usually may be omitted unless
the technician wants to confirm they
also are within specifications.
Hi-Fi TAPE
10.
11.
12.
OSCILLOSCOPE
DECK
under TEST
Fig. 7-18 Connection
SWITCH & CONTROL SETTING:
4
i
:
OLBY
eval
rea / COPY
~ SOURCE
Controls are same as
preceding section.
rewind
(4)
(5)
Fig. 7-19 Erase Efficiency Check Procedure
25
Advertisement
Table of Contents
