Panasonic RS-612US-D - Playback Performance Measurements

Playback frequency
response
Equipment:
* VTVM
* Oscilloscope
* Test tape---C-FH
Playback gain
Equipment:
*VTVM
* Oscilloscope
* Test tape--»C-FH
MEASUREMENT & ADJUSTMENT
. Test equipment connection is as same as “Head azimuth adjustment”
but use the test tape (C-FH) instead of head azimuth tape (See fig.
11).
. Place UNIT into playback mode.
. Play frequency response test tape (C-FH).
. Measure output level at 10kHz, 8kHz, 4kHz, 1kHz, 125Hz and 63Hz
and
compare
each
output
level
with
standard
frequency
333Hz,
at
LINE
OUT.
. Make measurement for both channels.
. Make sure that the measured value is within the range specified in the
frequency response chart.
Playback frequency response chart
333Hz
400Hz
125Hz —250Hz 6.3kHz 10kHz
Fig. 11
Adjustment
1. If the measured value decreases at high frequency range.
* Short the connection point (A) or unsolder connection point (C).
See fig. 19 on page 12.
. If the measured value increases at high frequency range.
* Short the connection point (B) or (C).
. Test equipment connection is shown in fig. 7.
2. Play standard recording level portion on test tape (C-FH 333H2z), and |
using VTVM measure the output level at LINE OUT jack.
. Make measurement for both channels.
| Standard Value: 0.42 V (—7 dB)
Adjustment
1. If measured value is not standard, adjust VR3 (L-CH), VR4 (R-CH)
(See fig. 20 on page 12).
2. After adjustment, check "Playback frequency response” again.
Playback S/N ratio
Equipment:
* VTVM
* Oscilloscope
* Test tape---C-FH
* Empty cassette
2. Play standard recording level test tape (C-FH 333Hz) and read out-
REMARKS
* Playback mode
* Playback mode
. Test equipment connection is shown in fig. 7.
put level on VTVM.
Refer to “Playback gain adjustment”.
. Place empty cassette (which has been cut) and play again.
. Measure noise level at this time using VTVM, and determine ratio of
this level to test tape output signal voltage (333Hz).
|
Standard Value: Greater than 46 dB
* Playback mode