Technics RS-676US

ITEM
MEASUREMENT & ADJUSTMENT.
REMARKS
Tape Speed
Equipment:
* Digital Electronic
Counter or Frequency
Counter (RP-8067)
* Test Tape...C-WAT
Tape speed accuracy
1. Test equipment connection is shown below.
R/P Head (Playback Mode) (Digital Electric Counter)
Fig. 15
. Play test tape (C-WAT 3,000Hz), and supply playback
signal to frequency counter.
. Measure this frequency.
. On the basis of 3,000Hz, determine value by following
formula:
Tape speed accuracy=(47 3.000 100%
where, f=measured value
. Take measurement at middle section of tape.
Standard Value: +1.5% |
Adjustment method
1. Play the test tape (middle).
2. Adjust the tape speed adjustment VR shown on page 19
so that frequency becomes 3,000 Hz.
Tape speed fluctuation
Make measurements in Same manner as above (beginning,
middie and end of tape), and determine difference between
maximum and minimum values and calculate as follows:
fi=fe x100]%
Tape speed fluctuation=[ 3.000
f1=maximum value
fz=minimum value
Standard Value: 0.5%
* Playback Mode
Wow and Flutter
Equipment:
* Wow Meter
* Test Tape...C-WAT
1. Test equipment connection is shown below.
Test Tape Playback Mode
Fig. 16
. Use wow test tape (3,000Hz) and measure its playback
signal on wow meter.
_ Wow & Flutter is expressed in percentage and that
measurement can be weighted by JIS Network. (WRMS)
. Measure at middie section of test tape.
Standard Value: 0.063% (WRMS)
* Playback Mode
10