NO. rlIl'ts TAPE
MQUIRED SELECTOR
POSITIOI.I
EQSw I BrASsl'l INPI'TSIG.]AL ALIG\OIENI PROCEUJRE LI}'IITED REMARKS
8. P/B Frequency
Response
Adj
ust.
(nonnal
)
t{IT-216 NORMAL NORIIIAL
no sigral
Plaltack MTT-216
standard frcquency response signal
(315H2), and nake note of the output 1eve1. Then
playback the frequency adjr.Etnent signal frcrn 31.5H2
to inkHz. At this time, the playbagl output levet
at eaci frequencyshould be within :2d&n
whenthe
standard output level is regarded as zero (0).
Should be
within:2d&n,
referencing
3l5Hzsignal
as 0.
Dolby off
9. P/iJ frequency
Response
Adj
ust.
(CrO2,
Ex)
MTT.316 CrOz
EX NOR]iiAL Set EQSelector to "CrO2" (or "EX'J position. Play
back standard frequency signal 315H2
of MTT-316
(5180uS+70uS),and rnakenote of the output level.
Then playback frequency aligunent signat from 31.sFlz
to l4ktlz. At this tine, the playba$koutput level
at each frequency should be withir :2d&n r'hen the
standard output level is regarded as zero (0).
Shouldbe
within:2dBn,
referencilg
315H2signal
as 0 [zero).
Dolbyoff
10. P/B Signal-to-
Noise Adjust. NORMAL NORMA-L Put the deck node without loading cassette
hub, and check noi.se 1eve1 at LINE oUTJacks.
Noise l€ve1 ----- no nore than -50dln(R[4s)
Likewise, check that at the respective mode: "CrOZ",
"E)c', "Do1by ol'1", "I.|PX.
FILTER
Should be no
lDre than
- 50d&r at each
node
11. FrequencyAdjr.lst.
of BIASOSC. cfz CrOZ Comect counter to the current output tenrinals of
erasing head lterninal No. 19 (+), No. 18 (-)].
set the BI.assw. to "cro2" node. Ilm the BLq.sosc
coi.1 to obtajn los}dlz oscillation frequency.
BIA.56C Coil --- L-201
Al-so check if oscillation frgquency at each I'NORMAL"
and "Exr Dosi.tion is 10skHz-skHz.
BiasoSC
frequency:
105ktlz
at CrO?
105ldz:sKtz-
At NORMAL
& EX
"REC'node
12. Bias Trap Adjust.
at RECEQAMP. EX EX CormectWl4vlbefore trap coil at mC EQAl'lP
for both
L and R ciarmels, ard adjust trap coil to obtain
ninim.un reading of vTlU.
Trap Coil --- L-ch L-105a
--- R-ch L-103b
At this tine, the VTW indlcatic'n should be no nore
than +20dBrn.
VTVMreadi-ng
should be no
more than
+
20dBn,
13. Bias Cunent Adj. NOFX''IAL NORMAI
CrOz CormectVTW across the 10-ohn resistor of the record
head.L-ch Tenri-nalNo. 42 ----- (+)
Terninal No. G.lD
---- (-)
R-ch Teminal No. 48 ----- (+)
Terninal No. G.lD
--- - (-)
(l) set the Blas sw to 'lioRMAI", and pre-set t}le
c1rrrent
-flow through the 10-ohn resistor to 300!A.
Trirmer Pot for NoRMAL
BIASADJ. -- Lch \4202a
Rdr I/T202b
NOFMAL
500!A
(=3nV,
at 10
ohns)
