Technics RS-M10 - Page 6

Playback frequency
if
Playback gain ik
Equipment: 2
*VTVM
* Oscilloscope 3
* Test tape --- QZZCFM
2
Playback S/N ratio
Equipment:
*VTVM
* Oscilloscope
* Empty cassette
* Test tape --» QZZCFM 3.
MEASUREMENT & ADJUSTMENT
. Test equipment connection is as same as “Head azimuth adjustment”
response
but
use
the
test
tape
(QZZCFM)
instead
of
head
azimuth
tape
(See
Equipment:
fig.
10).
;
*VTVM 2. Place UNIT into playback mode.
* Oscilloscope 3. Playback frequency response test tape.
* Test tape --- QZZCFM 4. Measure output level at 8kHz, 4kHz, 1kHz, 315Hz, 250Hz, 125Hz
and 63Hz and compare output level with standard frequency 315 Hz,
at LINE OUT.
5. Make measurement for both channels.
6. Make sure that the measured value is within the range specified in the
frequency response chart.
Playback frequency response chart
125Hz
{ 4kHz
t 250Hz
125H2 — 200Hz S00HZ 1kH2 4kHz
Fig. 14
Adjustment method
the measured value is not standard, adjust VR1 (L-CH), VR2 (R-CH).
. Test equipment connection is shown in fig. 10.
.
Playback
standard
recording
level
portion
on
test
tape
(QZZCFM
315
Hz),
and
using
VTVM
measure
the
output
level
at
LINE
OUT
jack.
Make
measurement
for
both
channels.
| Standard value: 0.39V |
Adjustment method
Al.
If
measured
value
is
not
standard,
adjust
VR3
(L-CH),
VR4
(R-CH)
(See
fig.
26
on
page
10).
.
After
adjustment,
check
“Playback
frequency
response”
again.
. Test equipment connection is shown in fig. 10.
2.
Piayback
standard
recording
level
test
tape
(QZZCFM
315H7z)
and
read output level on VT VM.
Refer to “Playback gain adjustment”.
Place empty cassette (which has been cut) and playback again.
Measure noise level at this time using VTVM, and determine ratio of
this level to test tape output signal voltage (315 Hz).
Standard value: Greater than 45dB |
REMARKS
* Playback mode
* Playback mode
+ Playback mode