Technics RS-M250

@ Fluorescent meter
Condition:
* Record mode
* Input level controls ---
* Output level control ---
* Tape selector
-+ Normal position
MAX
MAX
Equipment:
*VTVM
* AF oscillator
* ATT
® Overall frequency
response
Condition:
* Record/playback mode
* Tape selector
«++ Normal position
-» Fe-Cr position
«+ CrOQ2 position
-+ Metal position
MAX
- MAX
* Input level controls ---
* Output level control --
Equipment:
*VTVM
+ AF oscillator
* ATT
* Resistor (600 Q)
* Test tape
(reference blank tape)
--QZZCRA for Normal
++ QZZCRX for CrO2
-- QZZCRY for Fe-Cr
+++ QZZCRZ for Metal
3. Supply 1 kHz signal (—24 dB) to the LINE IN jack,
4. Adjust the ATT so that the output level at LINE OUT
5. Adjustment at “—20dB”.
6. Adjustment at “O dB”.
ITEM MEASUREMENT & ADJUSTMENT
1. Test equipment connection is shown in fig. 10.
2. As shown in fig. 11, connect the collector of Q206
and ground.
rom
then press the record button. Microcomputer
jack becomes 0.7 V (The input level at this condition
is termed the standard input level).
A. Adjust the ATT so that input level is —20dB Fig. 11
below standard recording level. J
B. Adjust VR11 so that the —20dB segment lights up in the -20dB+0.8dB range (L-CH ONLY)
(See fig. 12). = .
A. Adjust the ATT so that the output L SUTURE LUCE LECER CLERC
level at LINE OUT jack becomes
0.7V
20
[PEAK]
6
*
4*
22
0
«
2
F101
*6
8+
(The
input
level
at
this
condition
is
Fig.
12
termed
the
standard
input
level.)
ii
TOC
B.
Adjust
VR10
so
that
the
+1dB
CMuavuavaansanaays
vy
tan
(+1
dB)
segment
lights
up
in
the
0+
0.2
4B
MT
UTNUTUUUUT
CUTOUT
OU
range
of
the
standard
input
level
20
[PEAK]
6»
4+2+0+2
0068:
(See
fig.
13)
Fig.
13
7.
Repeat
twice
between
steps
5
and
6
above.
ai
[HCO
DDULUVV
A000
TT
Rg
8.
Adjust
ATT
and
check
that
all
:
aTTTTTTTTTITTTTTTTT
TTT
PTTITTITATITTTIT
basueavasasand
segments
light
up
when
an
input
signal
SUININIEVIUEIUUTTUTHUUEEETU
LAU
UTNE
TES
level
is
increased
to
10
dB
higher
than
20
6*4*52+0*
2
OO
<6
8
(100)
the
standard
input
level
(See
fig.
14).
14
Note: 1 ae
WAZ
Before
measuring
and
adjusting,
make
+5.50B
f
the
playback
f
ye
-—1+4
SB
sure
of
the
playback
frequency
response
+308
~_|+2.58
(For
the
method
of
measurement,
please
+20Bl
Anu
gone
00
B00
ky
SkH2
10
nae
refer to the playback frequency response). Eig =e srs nt eS | Bp
Note:
2
aia
\—2dB
; 12.5kKH
Test
tape
QZZCRA
to
be
supplied
after
aus
New
Former
Ps
July 1980 has higher recording sensitivity eo Refer to Note 2.
c “ . Zz
in the middle and high frequency range Fig. 15
* This chart indicates the standard values for the new type of QZZCRA when in use.
|
* ere This chart indicates the standard values for the former type of QZ7ZCRA when in use.
The new type of QZZCRA is marked as shown in fig. 16.
Former type New type
co
0,20]
Fig.
1. Test equipment connection is shown
in fig. 10.
2. Place the test tape (QZZCRA) in
the cassette holder.
3. Place UNIT into record mode, and 750 iz 100 ie 300H2 goon)
tape selector to normal position. te aa —15¢4B
4. Supply 1 kHz signal from AF oscillator _4 ie St
through ATT to LINE IN. oa
5. Adjust ATT so that input level is =e
—20dB below standard recording pole
level (standard recording level=O VU).