Teac V-970X User manual

TEAC
SERVICE MANUAL
V-970X/R-919X
STEREO CASSETTE DECK

V-970X/R-919X
1 SPECIFICATIONS
Track System 4-Track, 2-Channel Stereo
Heads R-919X 4: 2 Erase, 1 Record and 1
Playback (Rotary)
V-970X 3: 1 Erase, 1 Record and 1
Piayback (Combination)
Type of Tape Cassette tape C-60 and C-90
(Philips type)
Tape Speed 4.76 cm/sec. (1-7/8 ips)
Motors 3: 1 OC Servo motor
(for capstan drive)
1 DC motor
(for reel drive)
1 DC motor (for ancillary control)
Wow and Flutter (WRMS) 0.03 %
(R-919X), 0.025 % (V-970X)
Frequency Response (Overatl) —20 dB
20 — 21,000 Hz Metal Tape
(25 — 20,000 Hz +3 dB)
20 — 20,000 Hz CrO, Tape
(25 — 19,000 Hz +3 dB)
20 — 18,000 Hz Normal Tape
(25 — 17,000 Hz +3 dB)
Signal-to-Noise Ratio (Overall)
60 dB (3% THD Level, Weighted)
70 dB (Dolby B In, over 5 kHz),
80 dB (Dolby C In, over 1 kHz),
92 dB (dbx In, at 1 kHz)
Dynamic Range 110 dB (dbx in, 1 kHz
Peak Level)
Fast Winding Time Approximately 100
seconds for C-60
NOTES:
Improvements may result in SPECIFICATIONS changes.
Value of “dB” in the data refers to 0 dB (0.775 V), except where
Specified.
CAUTION
+t. Parts marked with this sign are safety critical components.
They must always be replaced with identical components —
refer to the appropriate parts list and ensure exact replace-
ment.
e Dolby Noise Reduction System manufactured under license
from Dolby Laboratories Licensing Corporation.
“Dolby” and the double-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.
dbx Noise Reduction system made under license from dbx,
Incorporated. The name ‘‘dbx” and the dbx symbol are
trademarks of dbx, Incorporated.
fi tk
Inputs Line: 60 mV, 50k ohms
Outputs Line: 0,3 V for load impedance of
50k ohms or more
Headphones: 8 ohms
Power Requirements 120/220/240 V
AC, 50/60 Hz (General export
models)
120 V AC, 60 Hz (U.S.A./Canada)
220 V AC, 50 Hz (Europe)
240 V AC, 50 Hz (U.K./Australia)
Power Consumption 27 W
Dimensions (W x H x D)
435 x 123.5 x 279.5 mm
(17-1/8" x 4-7/8" x 11")
471 x 123.5 x 279.5 mm
(18-9/16" x 4-7/8" x 11")
(V-970X, with side panel)
Weight 5.9 kg (13.01 Ibs) net,
6.6 kg (14.55 Ibs) net (V-970X,
with side panel)
@ Specifications were determined using
metal tape except as noted.
© Improvements may result in specifica-
tions or features changing without
notice.
@ Photos and illustrations may differ
slightly from production models.
iz
1. HHEISKBOED, PSK REFSCEMHVUET.
2. KVIAP IMO OGBld0.775V CHEE CTOETF.
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DUTHMSNTOEF.

| V-970X/R-919X
2 REMOVAL OF EXTERNAL COMPONENTS
HEB OH LF

V-970X/R-919X
3 PARTS LOCATION
3B an Bc im
POWER SW PCB Power transformer JOINT PCB D DBX PCB
SELECTOR PCB JOINT PCB C MAIN PCB
(General export)
70us sw METAL sw JOINT PCB A DISPLAY PCB
FWD Cassette sw REV JOINT PCB B
Rec safety sw Rec safety sw
(R-9I9X only)
Fig. 3-1 Topview tm

V-970X/R-919X
4
MECHANICAL
ADJUSTMENTS
AND
CHECKS
AM BBO EE & PER
4-1
PINCH
ROLLER
PRESSURE
4-1
EvF-no-FEBHA
1.
Press
the
cassette
switch
(see
Fig.
3-1)
up
to
set
the
deck
to
1.
HtYK+>
R(yF
(
Fig.
3-1
BR)
SEAHLTIL
the
playback
mode.
4*E-KFETS,
The
cassette
switch
should
be
pressed
up
throughout
measure-
WER,
ALYb
+
AY
FULACMLBGSTCE,
ment.
2.
CVF
+O-F*
P-LRNAREHNIS.
2.
Hang
the
spring
scale
from
the
pinch
roller
arm.
3.
RAE
YF
+
O-SOREMILE
SS
CRROAAKEIEOK
3.
Extend
the
spring
in
the
direction
shown
in
the
figure
until
BR,
CYF
+
O-DMBCE
PT
RZSY
YeThicseMess
the
rotation
of
the
pinch
roller
stops,
then
return
it
gradually
FSRBAKCES.
so
that
the
pinch
roller
comes
into
contact
with
the
capsten
4
bys.
O-SHGORHS
LOWER.
shaft
again.
BURIE
V-970X
F4OPYTH
390
9
~
490
9
4,
Read
the
value
at
the
moment
the
pinch
roller
starts
rotating.
HT5-4
HY
170
9
~
230
g
Standard
values
R-919X
FHD/REV
Lf
380
9
~
480
9
V-970X Take-up side : 390g —490g (13.8 oz — 17.3 oz)
Supply side 170 g — 230 g (6.0 oz — 8.1 02)
R-919X FWO/REV play: 380g — 480 g (13.4 oz — 16.9 02)
R-919X
V-970X
left
pinch
roller
right
pinch
rolier
Supply
side
Take-up
side
BEYF-O-5
Bee
aa?
7978 TIIPITM
Measure
when
in
REV
play
Measure
when
in
FWD
play
REV
1
BRIE
FWOT
TL
7
Bett
ae
Fig.
4-1
Pinch
roller
pressure
measurement
E>
+-O—S/PRHBE
4-2
TAPE
PATH
ADJUSTMENT
4-2
7
-PHEO
ME
Note: The following special tools and tapes are required for this
section,
Head check jig A (P/N 5736006600)
Head check jig B (P/N 5736006700)
MTT-150 test tape (for Dolby level calibration)
MTT-356 (or MTT-256) test tape (for frequency response
check)
MTT-902 mirror tape (C-90 type)
DECK
under TEST
R
OUTPUT AC Voltmeter
Fig. 4-2 Test setup for azimuth adjustment
PYVYAZMBEBERK
HE.
COMBETSROMAKOBR,
FAK
F—-THYE
CTH.
Av
biBA
(P/N:
5736006600)
Ay
FieSB
(P/N:
5736006700)
MTT-150
FAR+>F-—TD(PILVE—-
VAI:
Py
RA)
MTT-356
(RIAMTT-256)
FAR
+
F—
TC
BR
BAEHE
TAY
56
FA)
MTT-902
=3—->+-—T
(C-90#!)
O°{in
phase)
45°
90°
135°
180°
(out
of
phase)
inte
x04trAB
WADHD
Fig. 4-3. Confirming phase relationship
4c 48 RAHA

V-970X/R-919X |
V-970X
Note 1: When the record/playback head has been replaced, tighten %& 1. &°- HAY FARRULEL SI, Fig. 4-6 ORD (A),
screws (A), (B), (C) shown in Fig. 4-6 until they stop,
then slacken them by 1-1/2 turns before starting align-
ment.
Note 2: When the erase head has been replaced, install itasshown i 2. MAAyY RAMBLE LRI, Fig, 4-67 OLIICRAIS.
in Fig. 4-6.
1. Attach head position alignment jigs A and B, then set the deck 2.
to the play mode.
2. Fit jig B on the tape guide of the record/playback head as 3.
shown in Fig. 4-5, then align the height with screw (A) as shown
in Fig. 4-6.
3. Fit jig B to the head as shown in Fig. 4-5 to check its tilt and 4,
align it using screws (B) and (C) shown in Fig. 4-6. Then align
the height again with screw (A). 5.
4, Repeat alignments in procedure 2 and 3 two or three times to
align height and tilt. (When adjusted to the standard height,
the head should be under the tape guide.) 6.
5. Fit jig B to the tape guide of the left pinch roller and align the
height with nut (E). (The standard height is above the tape
guide.) 7.
6. Play test tape MTT-902, and adjust nut (E) so that the lower
edge of the tape guide of the record/playback head is in contact
with the tape edge, but the tape is not curled.
7. Adjust the azimuth of the playback head with screw (C) shown
in Fig. 4-6 according to item 5-3 (on page 15). If the screw is 8.
rotated by half a turn or more, turn screws (A) and (B) by the
same amount then align again from item 6 to correct the height
of the tape guide of the record/playback head. 9
8. Adjust the azimuth of the record head with screw (BD) shown ‘
in Fig. 4-6 according to item 5-5. (Refer to page 18.)
Screw (D) should not be turned more than half a turn.
9. After alignment is complete, check that the tape does not curl
over the tape guide by repeating play and stop operations.
head check jig A
(5736006600)
head check jig B
(5736006 700)
Fig. 4-4
Height Adj. Screw A
REC Head Azimuth Screw D S&MRRY
REC 7YVARERY
Kee
Pie
c
Tilt
Adj.
Screw
B
zimu crew ; FIL RB RY
P/B? UV AMBRY =e
REC Head P/B Head
BEN» F Ben *F
Fig. 46
(B), (C) MIEKSE THO, TOMB STNTHORY
& 1.5 GROSOKRRTHBEMOSCE.
Ny
POMBMBIBR
A,
BARY
BLT
+
E-RKETS.
Fig, 4-4 DAKDKRe BAYROT-T+ HAKKAR B
#@MT, Fig. 4-6 ORD (A) CHATHETS.
Fig. 4-5 OFSICBRR ENYRICMTCFVE CHERL,
Fig. 4-6 ORY (B), (C) TELE, BRAY (A) T
ASeeeTS.
Lic 2, 3 ROMB* 2~3 DRORL, BS, FIVE CIAB
3S. (BADBELT-TF > HL KFORMETS) .
ECYVF + 0-DOF-T*HA CBR BMT, tFyb
(€E) CTHACMBIS. (BAOBHAT-T>HTFOEM
tgd).
FAb+F—-T MIN-92 LEASH, R+ BAY kOT-TF
HI FORRMAA-VUGWRECBKSASHYb (E) &
mes S.
BENNY FOPIVA® 5-3 (1 X-YBik ) Ktto
T Fig.4-6 ORD (C) CHETS.
1/2 GK EGIL ERR ANY FOT-T + HFRS
EEOtSKH, RY (A), (B) SABELBES RCROR
BEPOGHT.
REWY FOV IVA 5-5 (18 N-VBM) KitoT
Fig. 4-6 ORY (0) THETS.
2Y (0) ORBBHIS 1/2 DRUALTS.
BCORBOR, TU + AhyTEROKRL, T-Te tit
ECT -TRA-NWVULBWC ERR S.
head check jig B
(5736006700) head check jig A
(5736006600)
Erase head
These should touch
EMACSE

R-919X
head check jig B
(5736006700)
head check jig A
(5736006600)
START
|”
Erase
Head
Height
Adjustment
(Using
Jigs)
7
FWD
erase
head
REV
erase
head
1, Connect the deck to test equipment as shown in
Fig. 4-2. REC*PLAY
2. Insert the head check jig A into the cassette holder. head
Close the halder then push the jig in firmly.
3,
Check,
in
FWD
play*,
height
of
FWD
erase
head‘s
A
c
E F
Db
B
tape guide using head check jig B. If needed, adjust
by turning nut A.
4. Similarly, check REV erase head in REV play*. If
needed, adjust by turning nut B.
5. Repeat steps 3 and 4 until both requirements are
satisfied.
Fig. 4-7 Head height adjustment
* Pushing up the cassette switch (Fig. 3-2), place in play mode.
Keep the switch pushed up during adjustments.
REC-PLAY Head Height Adjustment
1. Check, in FWD play*, height of REC*PLAY head’s
tape guide using head check jig B.
2. In REV play*, check it also.
Replace spacers below screws C and D with thinner
(thicker) ones. (For both C and D, the same num-
ber of spacers having same thickness should be added
or substracted).
F Spacer [1mm _| 5800695000
[Spicer | 02 mm |
[Spacer [0:28 mm | 5800595200__
REC-PLAY Head Spacers
* In both FWD and REV,
higher (lower).
Tape guide height?
* In both FWD and REV, the head check jig B can just
Bass smoothly between the edges of the guide.
or
* Between FWD and REV, relative height is reversed
(ex.: higher in FWD, lower in REV).
REC-PLAY Head Azimuth Adjustment
1, Playing a MTT-150 tape in the FWD or REV direc-
tion, check that the phase relationship between
L-ch and R-ch is within 45°.
2. Playing 10 kHz section of a MTT-356 or MTT-256
tape in the forward direction, adjust screw E so
that phase relationship becomes 0°.
3. In REV play, make the same adjustment with
screw F,
How many degrees was screw(s) in steps 2 and 3 More than 45°
turned?
| Less than 45°
Tape Path Adjustment
Playing MTT-902 mirror tape in FWO and REV, check
the following contents.
4
+ {s there tape curling at each tape guide?
+ Is the head core (silver) of the REC-PLAY head
visible from the tape edge?
+ Curling occurred
* Visible
+ Not touching
Erase Head Height Adjustment (Using Tape}
Using MTT-902 tape, correct by repeating tape guide
height adjustments between FWD erase head in FWD
play and REV erase head in REV play.
Adjust screw A for FWD erase head, screw B for
REV erase head.
+ No curling
+ Not visible
- Touches
COMPLETED
V-970X/R-919X

V-970X/R-919X
R-919X
Av F@AB
wy KOS
~y
FRSA
(5736006700)
(5736006600 )
AS—b
FWOR WAS vy F REVAWaS yy F
Wika» FMS CEA)
1. Fig.4-204 91 Fy $ EMTS. $-BAY FE
DAVY bh: HUTCAY KAMAN TATS.
TATE, Ay Kit AS CICADAS,
3. Ay KHMEBS HIN CEWDIL 1 iF? IC Mt SF-
WDINH RAY KOH T KMS EELT S.
Welty KATHE.
4,
WD
RRICREV
JL
1
BEY
CRS
BREVIS
:
ee
DHA
KGET
S,
Fig.
4-7
~v
FS
HE
Weitty KBE.
5. 340M SSE TM RT. Ay he Af yF (Fig. 3-28 EHICMULT, TUT EKITS.
DUT: E-FH, Atv Fld LIC MLMIS OK,
fh - Bn~y KRSM
L Ay KIRK BENNY TFWDIL 7 ie” ICRI S
SRO EN ROHL Kiet SEUSS.
2. WH RICREV DL 1 BEY HHT S
RUC.DN FNAN—HERMO BY (YL) EM
(TINA SB
(C,D Hb LIZED EDM IAB HMRI SIL, )
ae [we] ue |
By FRAN
FWD,REV
WEY CAEL) BG >
* FWD,REVi:AY FiKSLBIIH
Kiki RITAS.
Kit
+ FWD,REV Ti & DSO 5 Pr
CA > FWDRF ALY, REVEFEELY)
RM- Bay ks PYLVzAME
L FAR F—OMTT-150@ FWD Jy ti] XIEREV Jj
WIC IL 4 UT, L-chE R-chO fh EAS" LUA
THOEDEDDHAT S.
2F AR + F—IMTT-356XIAMTT-256M 10kHz
IKX4FE PWD RMIATU TUT, (HAO CaS
A DICMB RAVES WIS,
3. RIT REV DL 1 FOL Se ER VE TAS
1 «
tk2,340T BY BET (MH L EY?
F—-FEOME
MTT-902 = S— + 7— J@FWDRUREVTIUL 1
St Peeks.
*N-NUIGD
"WAS
“MHLW
WEN Y FMS (5 — SH)
MTT-9027 —J@ Liat T., FWDIL fia
FWDHiK BAY FAT Ra ARCREV IL
BFOREVI KAY K-27 Rite Wee KL
CHILES S. FWD RAY RIARLYAT,.
REV EAY RISA YB COMES TES.
AFD HART —IMA-WLEOD?
+h HAY FOOD PORWAF—THU ISAM
UTHALUD’?
>A ILLEY
«WAL
“4S

4-3
PHOTO
SENSOR
ADJUSTMENT
(R-919X)
1. Connect DC voltmeter as shown in Fig. 4-8.
2.
Playing,
in
REV
direction,
magnetic
tape
portion
of
test
tape
consists
of
elements
in
Fig.
4-9
(MTT-5551
tape,
etc.),
adjust
R84
so
that
a
voltage
of
3.0
V
is
obtained
at
TP.
3.
In
FWD
play,
similarly
adjust
R83
for
obtaining
a
voltage
of
2.8
V,
4.
Re-check
that
voltage
in
REV
play
does
not
change
from
3.0
V.
5.
Set
AUTO
REVERSE
switch
in
C=
position,
then
play
tape
in
FWD
mode
from
point
A
in
Fig.
4-9.
Check
that
tape
motion
changes
in
REV
play
mode
at
point
B,
then
changes
in
FWD
play
mode
at
point
A.
DC voitmeter
|
V-970X/R-919X
4-3
Fah
+t
>-t+39%
(R-919x)
1.
2.
DC
MBH
Fig.
4-8
DESKCHEITS.
Fig.
4-9
KCARTBROTAK
+
F-T
(MIT-5511
3)
O
HiT
—-TRAS
REV
TA
CHTAKKES,
IP
OBE
DM
Z.0VCGSES
ROA
LHBITS,
laltklc
FU
PU
4
THETA,
TP
OBER
28V
KGS
£D
R83
ABTS,
REV
FL
BFC
TP
OBER
3.0
V
DSORSAWCLABH
Bag
D.
AUTO
REVERSE
R4YF&
CadWRKCtybhl,
F-7e
Fig.
4-9
DO
ApaAkO
FID
TL
7atts,
T-TH
B
ROWMBT
REV
SUVKRERL,
TOB
AR
OWBNSHE
FW
SUBS
SCLAMRITS,
OC} R84 (REV)
J R83 (Fwo)
Fig.
4-8
Photo
sensor
adjustment
(1)
7
4
b
-+2
>
4
BBR!)
splicing tape
AVG4YvYr7-F-7F
leader tape t
YF F— 7
Magnetic tape
BAT -T
splicing tape
AVIA YA F-TF
A leader tape
YS -F-T7F
Fig.
4-9
Photo
sensor
adjustment
(2)
7
+
b
-
tz
>
+
3
8K(2)

V-970X/R-919X |
10
4-4 REEL TORQUE CHECKS AND ADJUSTMENTS
1. Using a cassette torque meter, check that reel torque at each
tape transport operation is within the following specified range.
fe ee 2 V-970X R-919X
25 ~ 60 g-cm 25 ~ 60g-cm
(0.34 ~ 0.83 oz-inch) | (0.34 ~ 0.83 oz-inch)
Take-up
(FWD/REV)
0.40 ~ 0.52
* . pee
Fast Forward/ 90 ~ 160 g-cm
Rewind (1.25 ~ 2.22 oz-inch)
*Back Tension
1. Connect a DC voltmeter between TP.4 and TP.GND on the
main PC board.
2. Play the middle part of test tape MTT-5511 and adjust the
follawing so that the voltmeter shows the values in the above
table.
V-970X: R42
R-919X: R42 (FWD), R74 (REV)
(Since R42 and R74 are interlocked, after adjusting one, check
the other.)
4-5 TAPE SPEED ADJUSTMENT
1. Connect a frequency counter to the deck as shown in Fig. 4-10.
2. Playing the mid portion of an MTT-111 test tape in FWD and
REV directions, adjust the semi-fixed resistor on capstan
motor so that tape speed becomes 3,000 Hz +5 Hz. An insu-
lated and non-metallic flat-head screwdriver should be used for
this adjustment,
3. In both FWD and REV play modes, check that the following
values are obtained at the beginning and at the end of the tape.
Deviation: 3,000 Hz +45 Hz
Width of deviation: Within 30 Hz
4-6 WOW AND FLUTTER CHECKS
Note: tn both FWD and REV play modes, these measurements
should be made at the beginning, middie and the end of the
tape.
4-6-1 PLAYBACK METHOD
1. Connect a wow and flutter meter to the deck as shown in
Fig. 411.
2. Loada TEAC MTT-111 test tape or equivalent and, in FWD and
REV directions, play it to measure the wow and flutter value.
3. Specifications are shown below.
0.05% WRMS (V-970X)
0.055% WRMS (R-919X)
4-4 YW hb ORRRORE
lL ARy hE RIL - A-—FICKSMEMAT HO MAINT
HDOELLCSHERSS.
25~60 g > cm
FAGLEF
eRe
(FHD/REV)
25~60 g + cm
0.40~0. 52V
(FHD/REV)
90~1609 - cm | 90~~160g - cm
enKy DeFvYary
1. DC @BGERt4% HAIN PCB ® TP.4 & TP.GND KCeMRTS.
2. FAb+F—T HIT-5511 OPRAAEBEL, BHO
0. 40~0. 56V
FRO (F.F.,REWSE )
DEROECSOLA RBIS.
V-970X R42
V-919X R42 (FWD), R74 (REV)
( R42 & R74 SMBHLTTWSOCHASMBLERAI
HHFTOHBITSce. )
4-5 F-TPREWE
1. Fig. 4-l0OD KK DITIMKRADUY SET y FICS B.
20 MTT-S Ab F—IO WE MEFWD.REVENENT
FEEL, KE D3, 000Hz PSHzIC OK DIC Fp
DAPY > EC-IO FEM IETS S. TAMIA HARK
SNEFTEGBR VY IFA KBSCNEWHNTSCK,
3. FWD,REVENENICRT, F-ID BME SRUICT
POH DEESNS CEMA S,
fi: = 3,000Hz * 45Hz
ZH. 30H2 LWA
4-6 D9 -7>v7T7RER
its FWD,REV#H, FTO BH, 4A, BRU CEA
ENMET SB.
4-6-1 BAK
1 Fig4-lIDkDICDD-DIOyvI + A-—- Fay FICHE
B.
2. TEAC MTT-HIF Ah» F~ TRIGA MER TAR,
FWDAUREVO ii i CHELID - D Oy BG WE
tS.
3. BUS 0.05% WRMS (Re HUE) V-970X
0.055% WRMS (HBRe HIE) creo R-919X

4-6-2 RECORD/PLAYBACK METHOD
Note: When measuring with this method, the recorded section
should be played back repeatedly to obtain an average value.
Be careful not to read the meter for those parts of the tape
in which wow and flutter components in recording and play-
back cancel each other.
4, Load a blank TEAC MTT-5521 test tape or equivalent and
record a 3,000 Hz signal in FWD (REV) direction.
5. Rewind (fast forward) the tape to the beginning of the recorded
section, and play it in the FWD (REV) direction.
6. The wow and flutter should not be more than specified.
Specification: 0.2% RMS (V-970X)
0.25% RMS (R-919X)
oscillator
frequency counter
attenuator DECK
roe
®
unew|
UNder
test
|
oureyr
Fig. 4-10 Connection for tape speed, wow and flutter
F—TRE, TV9-7oavIMeeRy
4-7 LUBRICATION
Lubrication is only required when parts are replaced. For this pur-
pose, use the oil and grease specified below.
Oil: TEAC TZ-255A motor oil (from TEAC TZ-255 oil kit),
Mobil D.T.E. Oil Light, or equivalent
Grease: ORE-LUBE G1/3 or equivalent
1. Apply a drop of oil with an oil applicator to a point about 1/3
the way down the shaft (from the free end) of the flywheel, then
insert the shaft into the capstan housing.
2. Apply a suitable amount of light grease to the well of the fly-
wheel bearing.
4-8 VOLTAGE CONVERSION
(FOR GENERAL EXPORT MODELS)
ALWAYS DISCONNECT THE POWER LINE CORD BEFORE
MAKING THESE CHANGES.
1. Locate the voltage selector on the rear panel. of the deck as
shown in the illustration.
2. Using a regular screwdriver, tura the selector until the numerals
corresponding to the vol’tage requirements of your area appear.
| V-970X/R-919X
4-6-2 $B
EB: KWEKOWA, RFLEMTEREDARYI, 18
teRikL, KES SEMMNGIRERG. REL
REC HBELEERODD - DOV IRI OMAANS p
VRUVLEETCARRMEAVKDICTS,
4, DOYVI+FAKR+F—TFTEAC MTT-5521 RlthH 74 a
TAL, 3,000Hzfes ZFWD(REV) 4 fl CHES SB.
5. FIORE UR Mare wEL CFWD(REV)A CBEST
Do
6 D9- DSy SHRI FO MDS ANGIE,
BUS: 0.226RMS (JERR ER HIE) (V-970X )
0.2526 RMS (JERR ES HH IE) (R-919X )
4-7 jE5h
TEGH ISEB AA DSSEA SN SOABBETSH. Hittite Feclc AA
PEATIWVETVU-ARGALET.
Atv: TEAC TZ-255A€—% + #1 JLU(TEAC
TZ-2557A fb: Fy kA)
E-EID: T+ EAT: Sth, KES
#8 4 oe
F\—-A:AP + W—-IG1/3, KIAMA
Ll. DOT WA IDLER iD 5491/3 F 7 aN, ETS CT
AT IV VGeIEWE, DSK HEP DAY +N
QUVVINE3ATS.
2. GHROTU-RADSTKAIL-NPULVLFRUIADIS.
capstan flywheel ass‘y
capstan shaft
well of
flywheel
bearing
capstan
housing
Apply a drop of oil here
Ll RET S
Fig. 4-11
Dee SE REEEESE EEE
oe
D
® a
Fig. 4-12 Voltage conversion

V-970X/R-919X |
5
ELECTRICAL
CHECKS
AND
ADJUSTMENTS
Fv ROWE
12
PRECAUTIONS
5-1
#2 fia
.
Since
this
deck
has
an
automatic
tape
selector,
be
sure
to
use
1
AKBAS—T-+
PLOT
AMR
BBC
ED
TOETOT,
test
tapes
that
have
tape
position
detecting
holes.
FAK
FHTABSST—T
+>
RY
YS
RMLILOHSH
.
Before
performing
adjustments
and
checks,
clean
and
demag-
NEBHLT<S
KEW.
netize
the
entire
tape
path,
then
check
tape
motion
condition.
9
PY
IRBOMRO
EAI,
WHAY
KE,
Be
HAWK,
>
:
ee
sure
the
deck
is
properly
set
for
the
voltage
in
your
_
SGM
RENENEERWREL,
DU
FETCH
ocality.
=
re
nys
-
.
CTCF
DET
AKE
S
HES
$
.
In
general,
adjustments
and
checks
are
made
in
the
order
of
L-ch
eho
as
aie:
v2
then
R-ch
3.
FICHE
OMOMU,
MERUF
ry
TlkL-ch,
R-choOiill
Double
REF.
Nos.
such
as
R12/R22
indicate
L-ch/R-ch.
IFTHD
TES.
.
The
AC
voltmeter
used
in
the
procedures
must
have
an
input
MRIZ/R22DKAITASN
COS
BB
IEL-ch_/
R-ch
impedance
of
1
MQ
or
more.
EMLET.
.
O4B
is
referenced
to
0.775
V.
4.
LNILHIAANTVESVTAIMQUEDEDSHEHE
TH
_
Unless
specified
otherwise,
adjustments
and
checks
are
made
in
us:
FWD
direction.
0dB=0.775V
6.
FICHE
KORO
S,
WRRUF
ry
DIFWD AAC
tre
3
Cha
Xs
5-2
TEAC
TEST
TAPES
5-2
TEACFAhK?F-TF
MTT-150:
For
Dolby
level
calibration
MTT-150:
RIVDE—:
UNL:
By
FH
MTT-356:
For
playback
frequency
response
check
for
CrO2,
MTT-356
:
CrO2,METALS—
JO
FAEIA
OR
RCRRM
UGE
HH
aenit
aaa
ek
it
tara
MTT-256
:
NORMALS
—
J
#4
J
ik
BCRPHE
MSE
HH
-256:
or
playback
frequency
response
check
for
=
eee
MTT- : METAL]—JIOSGREA
MTT-5571:
For
METAL
record
test
pes
seine
kere
MTT-5561:
For
CrO.
record
test
eens
Cea
iat
nea
MTT-5511:
For
NORMAL
record
test
MTT-5511;
NORMALZ—
JO
3H
RTA
FA
Oscilloscope
Oscillator Distortion Analyzer
AC Voltmeter
1kHz Filter
Attenuator
Le
LINE IN
Fig.5-1
Basictestsetup
BAM
HMM

V-970X/R-919X
Ra2 | Back tension
R11/R21 | Playback equalization
R12/R22 | Playback output level
R13/R23
R14/R24 | Record equalization
R15/R25 | Record level (NORMAL)
R16/R26 | Record level (METAL)
Fig. 5-2 Check and adjustment points on MAIN PCB (V-970X)
Fig. 5-3 Check and adjustment points on DBX PCB
13

V-970X/R-919X
14
Back tension (FWD)
R74
R83 Quick sensor (FWD)
Quick sensor (REV)
R701
R16/R26 | Record level (METAL)
[Raz
[R74 | Back tension (REV) |
R17/R27 Record bias
. U123 Bias oscillator adj.
Fig. 5-4 Check and adjustment points on MAIN PCB (R-919X)
Oscilloscope
under TEST
OUTPUT AC Voitmeter
Fig. 5-5 Test setup for azimuth check
AA ee ea

V-970X/R-919X
5-3. PLAYBACK PERFORMANCE
34 FR
TEAC test tapes :
Deck settings HIT-150 For Dolby level calibration
Mode PLAY MIT-256 For playback frequency response check for NORMAL
NR SYSTEM sw. OUT HIT-356 : For playback frequency response check for METAL and Cr02
HPX FILTER sw. OUT MIT-5511 : For S/N check for NORMAL
ITEM SETTING INPUT SIGNAL pate erie REMARKS
WEAR RQ AES i &
Bebo REM + BiG
OUTPUT (L/R)
MIT-150 Check Phase : Within 45°
ft 45° DAA
Connection Fig. 5-5
ae Beate Check/adjust in FHD/REV OUTPUT (L/R) Refer to
BBAYE respectively Azimuth screws Phase between L-ch and Fig. 5-8
eae FWD, REV ENEN FLYI/ | wey ose op HrT-356 of R+P head R-ch : 0°
ae Be (10 ktz ) B-BAYEO Maximumx output at L- &
PYUVARMBRY | R-ch's.
(Fig. 5-6, 5-7) L-R FID MBA O° TS
AOS ch HBAMHD
Same as above faj_E OUTPUT (L/R)
MIT-150 R12 / R22
2. Playback FHD DIRECTION FWD Ara my | -5 dB ( 436 mv ) Ll
output level
BEMAUANIL | Same as above fal k OUTPUT ¢L/R)
REV DIRECTION REV AM ne 5 db + 1.5 a8
( 367 mV ~ 518 mV )
3. ee PEAK LEVEL meter (L/R)
A Connection Fig. 5-1 MIT-150 R13 / R23 0 dB (RED) {it
ROAM 0dB (aR) ART
tyb :
OUTPUT (L/R)
4. oot oe ne ney output level at 351 Hz
requency F - and 10 kHz
response
Connect
Fon
(HIT-356)
fe
315
Hz
&
10
kH2
OWAAIRERE<
BE ARBs BOLD
Standerd #8 : Fig. 5-9
MIT-5511 OUTPUT (L/R)
5. Playback ( fully demagnetized S/N 45dB min.
S/N ratio ; ; using bulk tape —
Het S/N tt Connection Fig. 5-1 eraser )
PHM SNKHO)
REC Head
BAY F
P/B Head
BEN» KF
REC Head Azimuth Screw Height Adj. Screw
RECT UV RAMERY Baier
P/B Head Tilt Adj. Screw
Azimuth Screw Fb bE RY
P/B7UVAMBARY
Fig. 5-6 (V-970X)
O'lin phase) 45° 90° 135° 180°(out of phase)
4B ina
DAOOWS
Fig.5-8 Confirming phase relationship
48
(SWI +4 U-4 TCH
-5 dB ( 436 mV ) is reference level
BYELAILIS -5 dB ( 436 mV )
REC-PLAY head
FWD azimuth screw
FWD 48 a 3 ta L
REV azimuth screw
REV (ir 48 5a ta U
Fig. 5-7 (R-919X)
(4B)
+4
+2
0
-2
-4
Sa a |
40 31S HOw (Hz)
Fig. 5-9 Playback frequency response
Fi RE
15

V-970X/R-919X |
16
ADJUST MEASURING POINT,
aE
ae
ea
(or
CHECK)
RESULT
°
oe
ia
Ah
EEA
+
BRIE
6. CPS level
CPS VAIL
REMARKS
i %
Connection : Fig.5-10, but do not connect LENE IN (L/R). CINE IN (L/R) ERR
Tape : MIT-150 ( Use mid portion F—-TOPRAHTLE )
Measure in each condition specified below. FZCOSR4A CHES.
STOP mode Press CPS button
( » play indicator to get CPS display PRESS BP button TP. 1: (Level 1 )
blinked ) > > Measure level
ce ene YIF-3 s ee ie Pr REVS VAVEMETS ( eee
” ” PRESS <@<q button JP. 4: (Level 2 )
> > Heasure level
” ” 440K SVE VAVEMET S ( VAI2)
STOP mode Press CPS button :
( <@ play indicator to get CPS display PRESS mh button TP. 1: (Level 3 )
blinked ) cad > Measure level
(<4 BE4YD7-4% CPS KAY AIAL S VAWERMETS ( LAW)
est ) CPS RRKCTS Pr REVERS
n ” PRESS <@<@ button TP. 1: (Level 4 )
> > Measure level
” ” dq Ro VET VAVEWETS ( UNA)
| tart teat |
Adjust so that level becomes -20 dB using either of
2 conditions exept 2 conditions witch indicate max.
and min. levels, among ( Level 1) ~ ( Level 4). | ee ae
(UAW 1) ~ (UAW 4) OP CRARURNUNIVER -20 dB ( 77.5 mv )
Li 2 RHER<SRO 2 RADEBSDTUNIA
-20 dB KGSLIKMBIS.
oscilloscope
oscillator AC voltmeter
Fig, 5-10 Test setup for test point check FAK HT Uh Fry TROBE

5-4. MONITOR PERFORMANCE
ET a FR
Deck settings
Mode : RECORD/PAUSE (Except item 11 )
MASTER REC LEVEL cont. Maximum
AUTO MONITOR sw. . : SOURCE
NR SYSTEM sw. 2 OUT
MPX FILTER sw. 2 OUT
V-970X/R-919X
ADJUST
(or CHECK)
me
INPUT SIGNAL
ANNES
. Min. LINE
input level
WAY
R/NADVAIL
LINE IN (U/R) :
400 Hz / -19 dB
( 86.9 mv )
Connection
MEASURING POINT,
RESULT REMARKS
BE GAP + PARCL %
OUTPUT (L/R)
-5 dB + 3 dB
( 308 mV -~ 615 mV )
LINE IN (L/R) :
400HZ/-9dB (275mV)
PRESET cont.
. Specified (L/R)
LINE input level
LINE #RAH Connection
OUTPUT (L/R)
-10 dB ( 245 BV )
DAI : After adjusting, do not move the PRESET cont. (L/R). ( Specific position )
. MEter level
X~-B* VAIL
LINE IN (L/R) :
Connect ion A00H2/-94B (275mV)
. PHONES
output level
PHONES tH7)
VAI
Connection Fig. 5-11
PHONES LEVEL cont. : Max.
LINE IN (L/R) :
400HZ/-9dB (275mV)
. CD level check | Connection : Fig,5-1
STOP mode
VAIL: Fxy¥7 {CD LEVEL CHECK sw. : Set
LINE IN (L/R) :
400 Hz / -12 dB
(195 mV )
oscillator
DECK unde test
LINE IN
TEST LOAD RESISTORS
73 — Hin
MRIS PRESET DEALHMABWCE.
PEAK LEVEL meter ( L/R) :
0 dB (RED)
PHONES
At each channel
BFVAVE
-15 dB +3 dB
(97.5 mV ~ 195 mV )
LED: lit) | FAxT
PEAK LEVEL meter (L/R)
0 dB
Fig. 5-11 Test setup for PHONES check R—-> WHITHER
Frequency Counter
See
HOT GNO ie) ie)
(dB)
+6 iu
MAIN PCB TP.5
°o
DECK GND°
under TEST
Fig. 5-12 Test setup for bias osc. frequency adjustment
N44 PARIRE KR SIE Reee
NR OUT
—~—--- NR IN
+4
+2
-2
-4
25 Pook
400 12.5% (Hz)
Fig. 5-13 Overall frequency response (NR OUT)
oR SER BS te
17

5-5.
18
V-970X/R-919X
Sa ES FR
ITEM
WRB
12. Bias osc
frequency
KAPA
Rin ay
13. Built-in
oscilfator
adjustment
PAD Fe the 2s aa BE
14. Record EQ
RE EQ
15. Recored bias -1
RANT PA
tyt
16. Record azimuth
REP IVA
( V-970X )
RECORDING PERFORMANCE
Deck settings
MASTER REC LEVEL cont. : Hax
AUTO MONITOR sw. : TAPE
NR SYSTEM sw. 2 OUT os —— wie TEAC recording test tapes
MPX FILTER sw. : OUT MTT-5571 : For METAL
BIAS ( L/R) cont. : Center position PR MIT-5561 : for Cr0z2
LEVEL ( L/R) cont. : Center position. priv MTT-5511 : For NORMAL
SETTING INPUT SIGNAL aprile MEASURING POINT, REMARKS
oe AES or ) RESULT a #
mea REM +
Connection : Fig. 5-12
Tape : HMTT-5571 3
Mode : FWD REC/ PAUSE & W123 52 100 kHz £2k kz
REV REC/PAUSE
Mode : REC/PAUSE 2:
Tape : MIT-5571 och > Osci Hating
CAL START sw. : ON R7Ot 8.5 me pe frequency
( LEVEL LED : fit) saxy ) FRR
” TP. 2: 315 HZ and
CAL START sw. : ON R702 315 Hz / -35.5 dB 8.5 kHz
( BIAS LED : Jit FaXT ) ( 13 mV )
Set to center position
:
.
fia
fe
LINE
IN
(
L/R)
:
OUTPUT
(
L/R)
:
lg
Pe
anf
400
Hz
and
10
kHz
Equat
output
level
(
record
and
BIAS
cont.
:
Center
alternately
/
R17
/
R27
playback
)
between
400Hz
and
10
kHz.
LEVEL
cont.
:
Center
RES
7
400
Hz
&
10
KHZ
OBBWAMSUL<G
-42 dB ( 6.15 mv } act
Azimuth screw of | OUTPUT ( L/R )
LINE IN( UR) : REC head Phase between L-ch/R-ch : gaat
10 KHz / -42 4B BEAY KOPY a
(6.15 mv ) TARRY L- R Mota oO ce |
( Fig. 5-6 ) BOSF vp 2VRBAWH
17. Recored bias -2
K4PA+eyb
. Record jJevel
REVANY
. Total harmonic
distortion
BAEX
LINE IN ( L/R) :
400 Hz and 10 kHz
alternately /
RAS /
~42 dB ( 6.15 mV )
OUTPUT ( L/R )
Equal output level ( record and
playback ) between 400HzZ and 10 KHz.
400 Hz & 10 kiz ORMBWAAE L<G
actk
Connection Fig. 5-1
TAPE : MIT-5511
BIAS cont. : Center
LEVEL cont. : Center
Check
(R17 / R27 )
R15 / R25
R16 / R26 -8 dB ( 300 mV )
OUTPUT ( L/R) :
2.0 % or less 2.0% LR
Check
OUTPUT ( L/R) :
2.5 % or less 2.5% AF
Connection : Fig. 5-1
TAPE:
MIT-5511
OUTPUT
(
L/R
)
Output level ( record and playback )
RB
LINE IN ( U/R) :
400 Hz / -12 dB
( 195 av )
Connection : Fig. 5-1
TAPE : MTT-5571
Connection Fig. 5-1
TAPE : MTT-5571
TAPE : MIT-5561
LINE IN ( L/R) :
400 Hz / -12 dB
( 195 mV )
Connection : Fig. 5-1
TAPE : MIT-5511

|
V-970X/R-919X
ADJUST
(or CHECK)
EPH
oe POINT, REMARKS
WEA - MIE ® #
OUTPUT ( L/R )
Measure output level at
then at "+" portion.
HAVAILS "-" Ame "+" Ame
ENENHETS
INPUT SIGNAL
ITEM SETTING
i ANNES
MRA R €
TAPE : MTT-5511
Mode : REC / PAUSE
CAL START sw. ON
won
-" portion
LEVEL cont. (L/R)
Fully "-" position then
fully "+" position
a Re "+" A
teow
Variation between "-" and “+” portions
"ee" BOUAILEIL
4 d8 or more 4 dB YE
OUTPUT ( L/R )
Measure output level at "-" portion
then at "+" portion.
HAVANA "-" Aime "+" AAC
ENENHETS
(
20. Buili-in
oscillator —
(
BIAS,
LEVEL
=|
Tape:
MIT-5511
check
)
|
Hode
=:
REC
/
PAUSE
CAL START sw. =: ON
BIAS cont. (L/R)
Fully “-" position then
fully
"+"
position
Variation
between
"-"
and
"+"
portions
"-"
Fi—i,
RK
"+"
Aa
"eh
&"e"
HOUAIVEME
—i
5
dB
or
more
5
dB
Eb
21.
Overall
Connection
:
fig.
5-1
:
LINE IN ( I/R) :
frequency
TAPE:
MIT-5571
ae
:
Fake
response
TAPE
=
MTT-5561
40 H2
~
12.5
kHz
/
OUTPUT
(
L/R)
:
Standard
Fig.5-13
-42 dB ( 6.15 mv )
SRA EHE «| TAPE: MTT-5511
METAL 45 dB min.
Cr 02 45 dB min.
OUTPUT ( L/R )
Connection : Fig. 5-1
22.
Overall
TAPE:
MTT-5571
NORMAL
44
dB
min.
S/N
ratio
TAPE:
HIT-5561
BS
S/N
It
400
Hz
/
-9
dB
(
275
mV
)
is
the
TAPE MIT-5511
reference level.
BEL AMIS 400 HZ / -9 dB ( 275 mV )
Connection : Fig. 5-1
but engage 1-kHz filter
1-KHZ 74 DV 2—ER
23. Erase efficiency | TAPE : MTT-5571
AME
LINE IN ( U/R) :
1 kHz / +1 dB
( 0.869 V )
OUTPUT ( L/R )
Check 65 dB min. ratio
Record
a
1
kHz
signal.
Erase
thr
latter
half
of
the
recording.
Rewind
and
play
to
fined
the
difference
between
the
1
kHz
portion
and
the
erased
portion.
RADA
EBELKCBOVNIVERELDAVEL,
BEADEMAKUKROMALAVEORENE,
Same
as
above
Same
as
above
Check
OUTPUT
(
L/R)
:
fal
fa
o£
65
dB
min.
ratio
24,
REC
MUTE
function
Record
a
1-kHz
signal.
Push
REC
MUTE
bitoon
midway.
Rewind
and
play
to
find
the
difference
between
the
1-kHz
REC
MUTE
35
portion
and
the
"rec
mute”
portipon.
1
KHZ
ESEREL.
BHT
REC
MUTE
RAIL
CRE
BRERP
LIED.
COT -TEBEL, 1 KHZ MP CRMESMP COMNVUAVESHE.
LINE IN :
Same
as
above
L
ch
een
check
OUTPUT
(R)
Ja
Rh
No
signal
30
dB
min,
ratio
25.
Channel
FUZ8
separation
F
vrai
Set
the
deck
to
record
mode.
Rewind
and
play
to
find
the
difference
between
the
1-kHz
recorded
portion
(
L-ch
)
RNy-Yary and " no signal “ portion ( R-ch ).
RoR,
BELT
1-kHz
BEM
(
L-ch)
ERIESRAMD
(
R-ch
)
EODHAVAIVECHE.
Change the above connection and check reverse operation also,
l-ch
&
Rh
ANBAKBAKOWTHEF
ry
7tSCE.

V-970X/R-919X |
20
ADJUST MEASURING POINT,
ee ore eset (or CHECK) RESULT a
2 SP RENT + RA
LINE IN
L ch No signal
Connection Fig. 5-1
but do not connect LINE (L)
OUTPUT (R)
RUBS : ;
:
nd
OUTPUT
(L)
40
dB
min.
ratio
26. Adjucent track a R ch 125Hz/-9dB
ot Lch DABNORRAE (275mV)
ih RA: . I
JAAK-F Record a 125-Hz signal on R-ch track and note output level. Invert tape4 and play R-ch track. Check leakage 1
level against the output reference of previously recorded porton. shee |
R-ch KIYyZkK 125 12 ERBL, COBEHNSRRLAWETS, | =
REF -TFEREL, BELKHO R-ch HAVAIVEBRELALEORERE.
iy he LINE IN (L/R) : R71 ( Decoder ) | Between 1P.2 8 1P.1 : 45 my oc
ee. 1 kHz / -9 dB
NR
SYSTEM
:
(275
mv
)
R72
(Encoder
)
28,
dbx
}
j
decoder
level
Mode
=:
PL
MIT-150
R51
/
R61
eae
LINE
IN
(L/R):
ae
ee
nee
1
kHz
/
-12
4B
R52
/
R62
;
(
195
mv
)
Connection
27. dbx adjustment
Between
TP.3&T2
40:
45
my
OC
dbx
-
OUTPUT
(L/R)
aa
+0.5 dB ( 820 av ) [
OUTPUT (L/R)
encoder level -8 dB ( 308 mV )