Technics RS-M14 User Manual

. Make sure that the measured value is within the range specified in the overall frequency response chart
(Shown in fig. 33).
. Change test tape to Fe-Cr (QZZCRY), CrO2 (QZZCRX) and metal (QZZCRZ).
. Set the tape selector to each position.
. Measure in the same manner from step (3) to step (8).
. Make sure that the measured value is within the range specified in the overall frequency response chart
for Fe-Cr, CrO2 and metal tape (Shown in fig. 34).
Adjustment — Using bias current
1. When the frequency response between the middle and high
frequency range becomes higher than the standard value, as *
shown by the solid line in fig. 35’ increase, refer to bias
current adjustment.
. When it becomes lower, as shown by dotted line, refer to
bias current adjustment.
Note:
For the method of bias current measurement, refer to “Bias
current adjustment” on page 8.
1kHz = 2kHz ; 8kHz 12kHz
@ Fluorescent meter . Test equipment connection is shown in fig. 32.
Condition: . As shown in‘tig. 36, connecting the base of Q402 and
* Record mode ground stops the oscillation of the astable multivibrator
* Input level controls --- MAX comprising Q402 and Q403.
* Tape selector . Supply 1kHz signal (—24 dB) to the LINE IN then press
.-- Normal position the record button.
. Adjust the ATT so that the output level at LINE OUT
becomes 0.39V (The input level at this condition is termed
the standard input level).
. Adjustment at “—20 dB”:
A. Adjust the ATT so that the input level is —20dB below
standard recording level. ao
B. Adjust VR401 so that the —20dB segment at
ights
up
in
the
~200.8dB
range
(L-CH
—.
SU/IIIMIUIIIIIIIIIIIIIIIIIIIIIIUIIUI1111111111HIHI1
only) (See fig. 37). ray
. Adjustment at “OdB”: 2 6+ 4°25 0 2 00 +66
A. Adjust the ATT so that the output level at Fig. 37
LINE OUT becomes 0.39 V. ei scence
(The input level at this condition is termed MYTYTETTYYT TTY = (+108)
the standard input level.) STMT UU MT
. Adjust VR402 so that the +1dB segment a; el a oe ak an
lights up in the O+0.2dB range of the pan lhe abated
standard input level (See fig. 38). ":
. Repeat twice between steps (5) and (6) above. Mmm ccc cece
. Adjust ATT and check that all segments lights shaven asuaaaviasiauiatas Sarasa
up when an input signal level is increased to STILT ATLA UU
10 dB higher than the standard input level (See 20 PEAK) 6 * 42+ 20 2 («6 8» (1048)
Equipment:
*VTVM — * AF oscillator
* ATT * Resistor (600Q)
@ Dolby NR circuit . Test equipment connection is shown in fig. 40.
Condition: . Place UNIT into record mode, set the Dolby NR switch
* Record mode to OUT position and supply to LINE IN to obtain
* Dolby NR switch --- IN/OUT —34.5dB at TP11 (L-CH), TP12 (R-CH) (frequency cron TPL CH)
* Input level controls --- MAX 5kHz). ae ea
. Confirm that the value at IN position is 8(+2.5)dB LINE IN [X (ieee
Equipment:
se
Q
fee
aa
ter
than
the
value
at
OUT
position
of
Dolby
NR
1
*VTVM
+
AF
oscillator
a.
P
y
SOL
OOOO
OQ.
*
ATT
*
Oscilloscope
:
AF
oscillator
ATT
Record
mode
©
VTVM
*
Resistor
(600
Q)
Fig.
40

Technics RS-M14 Specifications

General

Brand	Technics
Model	RS-M14
Category	Cassette Player
Language	English