Teac CX-400 - ELECTRICAL ADJUSTMENTS AND CHECKS; PRECAUTIONS

5
ELECTRICAL
ADJUSTMENTS
AND
CHECKS
PRECAUTIONS |
1. Before performing adjustments and checks, clean and
demagnetize the entire tape path.
2. Make sure the deck is properly set for the voltage in _
your locality.
3. In general, adjustments and checks are done in the order
of L-ch then R-ch. Double REF. Nos. and test point de-
signations indicate L-ch/R-ch.
_ (Example: R11/R21)
4. The value of “dB” refers to 0 dB (0.775 V). If an AC
voltmeter calibrated to 0 dB (1 V) is to be used, ap-
‘propriate compensation should be made.
5. The AC voltmeter used in the procedures must have an
input impedance of 1 M-ohms or more.
6. Note the “Deck settings’’ at the top of each chart. The
settings must be used for all the checks or the chart un-
less explicitly stated otherwise.
OSCILLOSCOPE
OSCILLATOR DISTORTION ANALYZER ©
AC Voltmeter
IkHz FILTER
" Ss2
“ATTENUATOR
:
Fig. 5-1 Basic test setup
—70 dB or more ... What doés it mean?
| CX-400
Values in dB are often given like this: “—70 dB or more”’.
This sometimes leads to confusion. Is —76 dB more than .
—70 dB or less? To put the record straight, the “more”
refers to the absolute value. The absolute value of —70 is
|70|. The absolute value of 76 is |76| which is 6 more
than 70.
So, —76 dB is “more” than —70 dB
—55 dB is “‘less’’ than —60 dB