Playback Performance - Tascam 122MKII Service Manual

122MKll
6·1. PLAYBACK PERFORMANCE
Initial Settings
-TfJliI~~JE
DOLBYNRswitch OUT
o
UTP UT switch
: REPRO
MPX FILswitch OUT OSC switch : OFF
TAPE switch I\lORMAL
ADJ switch
: OFF
Mode : PLAY
1.
2.
ITEM
WYlJj E!
REC· PLAY
head azimuth
~.
ili"'Y
i'
7'.J?7.
Repro
output level
iIl~ t±l:tJ I/"')~
SETTING
&;l lE
Connection
(I~*~)
:
Connection
(j'l:'r;;) :
Connection
(~~J'l)
:
-
Fig. 6-4
Fig. &5
Fig. &6
INPUT SIGNAL
A:IJ{jj~
MTT·256
10 KHz section
MTT-150
ADJUST
(or CHECK)
tJj)!.!M]i'Ji
P.B azimuth
adj. srews
(Fig . &4-2)
Rl15/ R215
(Fig. &2)
OUTPUT
CONT.
R201
( Fig. & 1)
HEASURING POINT,
RESULT
;lI
l
llE@pJi • OOU fin
OUTPUT:
Pha se between L-ch/R-ch: O'
Hax. output at L-ch
&
R-CH's
L-R M lI)(!t m~tJ( O'
-z:
.§. ":llWi
ch
P.;Xl:*:::t.:IJ
TP. 11 / TP. 21 (Fig. &2) : 245 mV
OUTPUT (RCA pin jack) L-ch:
-7 dBV (0.447 mV)
OUTPUT (RCA pin jack) R-c h:
-7 dBV (0.447 mV)
After adjusting, do n ot move the outpu t
cont.
(Nominal position)'
V!l!liKz
1;1: OUTPUT
":l J;:
.7.7
~thtJ\ c;
:t;,:( \;: Co
C\ll.)2:{UlIf)
3. Repro frequency
responce
jfi~I!J;~~j~11
Connection (j}ft;<) : Fig. &6 MTT-256 R116/R216
(Fig. &2)
OUTPU T ( RCA pin iack) :
Level difference as slight as poss i­
ble between for 315 Hz and 10 kHz,
315 Hzc 10
kHzll)t±l:tJtJ( f'iJ I/"')~I':'
:t;,:{'J:5 tnJ!l
Check
OUTPUT (RCA pin iack) :
Spec ifications
mll\:
Fig. &7
5PI( A
oscilloscope
O'CdIO,COp. Amp
AC voltmeter 08
O~
DECK
Ef]
"i'
tj"1i\
~ Ii\ ~
under
ti'lfi'''i\ (il~ ~
AC Voltm ete,
0
test
<'0
HOR
Iii
Fig. 6·5 Connections Through Test Points
DECK
~-----4----r-~
____
-J
undor TEST
f- ' ------J~
o
0
~~~ ' ~~~~ ' ~I~~fflIDW m ~
'---_ _ _- ' R
OUTPUT
oscilloscope
Fig, 6-4-1 Test setup for azimuth check
1n:;j:lnlJ:'EJ9:Hl'E~
RE C Head A,imulh Screw 0
Amp 5PKR
REC
7 '-'77.1' : 1!.!*S!
Height Adj . Sc rew A
,ii;2W1!.'~ OJ
P / 8 Head
Tilt Adj. Screw 8
DECK
L 51
3')1-
H~)!.t:;r. OJ
under
o
0
<'0
c..t:...e_st _ _
-...l
R
REC Head P / 8 Head
AC voltmeter
Ull" "
f'
jJj~" .>
f'
Fig , 6-4-2
Fig. 6-6 T est setu p for output check
tl',1J ; ~II:AEB~IDjiJ~~
0° lin phase) '45°
90° 135° 180
0
tout o f phase)
fjiJtt-lfj i.2!
{;'iA§
40 63 125 315
10k (Hz)
Fig. 6-7 Repro Frequency Response
Fig, 6 -4-3 Pha se Difference
iiL~§fj.%Y;~
-2 1­