Teac V-870 User manual

TEAC
SERVICE MANUAL
Vv:
870
STEREO CASSETTE DECK

V-870
1 SPECIFICATIONS
{tte
Track System 4-Track, 2-Channet Stereo
Heads 3: 1 Erase, t Record and 1 Playback
(Combination)
Type of Tape Cassette tape C-60 and C- 30
{Philips type)
Tape Speed 4.76 cm/sec. (1-7/8 ips)
Motors 3: 1 DC Servo motor
{for capstan drive}
1 DE motor
(for reel drive}
1 OC motor (for ancillary control}
Wow and Flutter (WRMS) 0.025 %
Frequency Response (Overail) —20 dB
20 — 21,000 Hz Metal Tape
“(25 -— 20,000 Hz +3 d8)
20 — 20,000 Hz CrO. Tape
(25 — 19,000.Hz +3 dB).
20 ~ 18,000 Hz Normal Tape
(25 — 17,000 Hz +3 dB)
iat etch Ratio {Overall}
80 d8 (3% THD Level, Weighted)
"70 dB (Solby Bin, aver § kHz),
80 dB (Dolby C1 ,over 1 kHz),
ait 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
4.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.
Dojhy Noise Reduction System manufactured under license
from Dolby Laboratories Licensing Corporation.
“Dolby” and the deuble-D symbol are trademarks of Dolby
Laboratories Licensing Corporation.
Inputs Line: 60 mV, 50k ohms...
Outputs Line: 0,3 Vv for load mehr of
50k ohms or more Ree
Headphones: 8 ohms”. ~
Power Requirements 120/220/240 vi
AC, S0/60 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 (Wx H x D)
435 x 123.5 x 279.5 mm
(17-7/8" x 4-7/8" x 11"
Weight 5.9 kg ($3.01 {bs) net
Standard Accessories
Input-odtput connection cords
@ Specifications were determined using
metal tape except as noted.
@ tmprovements may result in specifica-
tions or features changing without
notice.
@ Photos and illustrations may differ
slightly from production models.
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V-870
2 REMOVAL OF EXTERNAL COMPONENTS
HB OH LA
DisassembjJe in number-order
HSL HLTK a

POWER SW PCB
Power transformer
7OAs sw
Rec safety sw
’ 3 PARTS LOCATION
36 se AC i
METAL sw
Cassette sw
Fig, 3-1 Top view
JOINT PCB C MAIN PCB
PhS oe
JOINT PCB A
DISPLAY PCB JOINT PCB B
the

reustee
4. MECHANICAL ADJUSTMENTS AND CHECKS
GAB DAME CHEER
4-1 PINCH ROLLER PRESSURE
1. Press the cassette switch (see Fig. 3-1) up to set dhe deck ta
the playback mode.
The cassette switch should be pressed up throughout measure-
ment,
. Hang the spring scale from the pinch roller arm,
3. Extend the spring in the direction shown in the figure watil
the rotation of the pinch roller stops, then return it gradually
so that the pinch roller cames into contact with the capsten
shaft again.
4, Read the value at the moment the pinch roller starts rotating.
Standard values
Take-up side
Supply side
ho
390 g — 490 g (13.8 oz — 17.3 oz}
170 g — 230 g (6.0 oz — 8.1 02)
Supply side
TS
4-1 EwrFea— SRD
1 ARYh. Rt F (FIO. $1 BRR) BEAICHUTSY
4+E~KEGS,
HER, AvVYb- Zt Y FIG LAICHUBU STE.
2, CYR +O-D- P-ACARREENTS.
3. Bee vs- O-DOREAILESE CHROAMCEROK .
&, CyF-o- PRCT ame vay helenae
KORACI.
4, ¢yvF+oO- SHOOMHSLEOWERE,
RBI FL7PYTH 390 g ~ 490 9
HTS4IH 178 g ~ 230 9
Take-up side
T4AIF YT H
Fig. 4-1 Pinch roller pressure measurement EY F-O—- 3 ci A -
4-2. TAPE PATH ADJUSTMENT -
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 Dalby level calibration)
MTT-356 (or MTT-256} test tape (for frequency response
check)
MTT-902 mirror tape {0-90 type)
DECK
undar TEST
R
OUTPUT AC Voltmeter
Fig. 4-2 Test setup for azimuth adjustment
PYUVARBBRG
4-2 F—-PHRTMWE
HE COMBEITSIROICAADNBR, FAR:
TH.
Av FiBRA (P/N: 5736006600)
Aw PAB (P/N: 5736006700)
MTT-150 FAR+7T—-DCRILE—:
MTT-356 (KIKMTT-256) TAR:
=A)
MTT-902 = 3—
F— PALE
PAIL: Gy bh AD
TT FEB RE
—F (C-908)
Oo
O° (in phase) 45° 90° ~—S-135°—- 180" (out of phase)
Ti e468 aa
PAOD SE
Fig. 4-3. Confirming phase relationship
AB RTH

Note 1: When the record/playback head has been replaced, tighten -
screws (A), (B), (C} shawn in Fig. 4-6 until they stop,
then siacken them by 1-1/2 turns before starting atign-
ment.
Note 2: When the erase head has been replaced, install it as shown
=
De
o
>
on
~~
in Fig. 4-6:
. Attach head position alignment jigs A and B, then set the deck
to the play mode,
Fit jig B on the tape guide of the record/playback head as
shown in Fig. 4-5, then align the height with screw (A) as shown
in Fig. 4-6,
Fit jig B to the head as shawn in Fig. 4-5 to check its tilt and
align it using screws (B) and (C) shown in Fig. 4-6, Then align
the height again with screw (A).
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 wnder the tape guide.)
. Fit jig B to the tape guide of the ieft pinch roller and align the
height with nut {E). (The standard height is above the tape
guide,)
. 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 curted.
. Adjust the azimuth of the playhack head with screw (C) shown
in Fig. 4-6 according to item 5-3 (an page 15). If the screw is
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.
. Adjust the azimuth of the recard head with screw (0) 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.
. 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)
REC Head P/B Head
Ban» F BEA F
Fig. 4-6
21 BR BAy FERRE La. Fig. 4-6 ORD (A),
(8), (0) MILKSKTHS, TOMBASTNTNORY
& 1.5 DEOSORKKETHBEROSCE.
322 BEAy ReReLecaid, Fig. 46° OLIKRATS.
1. AY FORMBRBIBR A,B ety hULS LT + E-KRTS.
2. Fig. 4-4 DADKH+ BAY EOT-7 + HFK B
#4T, Fig. 46 ORD (A) CHARIS.
3, Fig. 4-5 OLDCARB Ay FICMTCFIV SHER,
Fig. 4-6 ORY (B), (0) THRLER, BRAY (A} T
BS HET S. ,
4. bie 2, 3 ORs 2~3 DHRORL, BS, FIVbeB
TS. (BEOREMT-TF >HI FORHECTS).
8 EEYF+O-FOF—7F HA PRBR BAT, Fy
{E) CTHSEHBITS. (BAIOBRT-T* H7KOEM
etd).
6 FAb+F7—-TF HIT-902 SESH, Re BAY FOT-T
H4KOPMRD-VUGVBRKSRSASIYR (De 7?
MRSS.
7, BEAySOPIVA® $318 (11 N8-DBR) Kiko
Tt Fig.4-6 ORY (C) CHRYS.
1/2 BRK EBILE ESR: BAY FOFT-7 + AA PRS
KkEnDtSKH, 2D (A), (3) DARELEBRS ACROR
BEPORST. :
8. REAYFOPYVA® 5-518 (13 A-DBR) ichto T
Fig. 4-6 ORY (D) CTHRTS.
2Y (0) ORRBHIt 1/2 MRIKALTS.
9. BUOMROBR, Ter - AbyvTRBORBL, 7-7 HL
ECF-TRH-VLBWE ESTERS,
head check jig B
head check jig B (5736006700) head check jig A
{5736006 700} _(5736006600}
Fig. 4-4 Fig, 4-5
igt dj. A
REC Head Azimuth Screw D a al aa tas
py uo
REC 7 2 V ARE RY These should touch
P/B8 Head 4 Tilt Adj. Screw 8 HBSUAR
Azimuth Screw C panes Fl FBR
P/BTYVVAWERAY

4-3 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.
25 ~ 60g-cm
{0.34 ~ 0.83 02-inch}
Fast Forward/ 90 ~ 160 g-cm
Rewind (1,25 ~ 2.22 02-inch}
*Back Tension
ft. Connect a BC voltmeter between TP.4 and TP.GND on the
main PC board.
2. Play the middle part of test tape MTT-5511 and adjust R42
so that the voltmeter: shows the values in the above table.
4-4 TAPE SPEED ADJUSTMENT
1, Connect a frequency counter to the deck as shown in Fig, 4-7.
2. Playing the mid portion of an MTT-111 test tape, adjust the
semi-fixed resistor on capstan motor so that tape speed
becomes 3,000 Hz «5 Hz. An insulated and non-metallic
flat-head screwdriver should be used for this adjustment.
3. 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
4-5 WOW AND FLUTTER CHECKS
Note: These measurements should be made at the beginning,
middie and the end of the tape.
4-5-1 PLAYBACK METHOD
1. Connect a wow and flutter meter to the deck as shown in
Fig. 4-7. . .
2. Load a TEAC MTT-111 test tape or equivalent and, play it to
measure the wow and flutter value.
3. Specifications are shown belaw.
0.05% WRMS
4-3 YI bILPRERBRURE
lL AY hMhILD - A-FTKSMEMOFROBANT
HSLLAERATS.
FABPIYTS +b 25~60 ge cm -
* KRY DFYY ay be 6, 40~0, 56V
RNY DF YvrYar
1. OC @SQERe HAIN PCB @ TP.4 & TP.GND (CRESS.
2 FAbe FF NIT-5511 OPRAHESHEL, BEHOHAR
BLEROWKESLS M2 SBMTS.
44 FH TREE
lL Big 7 OKDSICIMRKADY SSP y ICMAT S|
2 MTT-1SFAb-F-7O PM BEBALT. FT —OME
3,000Hz TSH2IZTHAAKAI $~pAIAZGuV: E-FOP
PEI A PRET S. PARTS RANKS REY IT
A KS NGMHTSCE,
3. FIO BW BMUICT FROMMBONSILE
FETS,
Wi: 3,000Hz = 45Hz
ee: 30Hz2 Law
99 -7o>yvy FER
JER F— TORO, PH, BRU CEM ENWMETS.
4-5-1 BAER
lL Fig.4-7 MEAD Doyo A—-SEFY FCM
rss) ° .
2. TEAC MTT-1UF Ab +> F—TPRidH soe RAK,
HELID- Poy Tew TS.
3, BK 0.0599 WRMS (MB ReAB IE)

4-5-2 RECORD/PLAYBACK METHOD
Note: When measuring with this method, the recorded section
should be played back repeatedly to abtain an average vaiue,
Be careful not to read the meter for those parts of the tape
in which wow and flutter components in recording and play-
hack cancel-each other.
4. Load a blank FEAC MTT-5521 test tape or equivalent and
‘record a 3,000 Hz signai.
5. Rewind the tape to the beginning of the recorded section, and
play it.
6. The wow and flutter should not be mare than specified.
Specification: 0.2% RMS
oscillator
frequency counter
i wow/flutter meter
DECK
under test | output
Connection for tape speed, wow and flutter
F~-TRE, VO-7evF MEER
Fig, 4-7
4-6 LUBRICATION
Lubrication is only required when parts are replaced. For this pur-
pose, use the oi} and grease specified betow.
Oil: TEAC TZ-255A motor oi (fram 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 dawn the shaft (fram the free end} of the flywheel, then
insert the shaft inta the capstan housing.
2. Apply a suitable amount of light grease to the well of the fly-
wheel bearing.
4-7 VOLTAGE CONVERSION
(FOR GENERAL EXPORT MODELS)
ALWAYS DISCONNECT TRE 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, turn the selector until the numerais
corresponding to the voltage requirements of your area appear.
4-5-2 SRB .
HR: RMRAOBS EMPEREDAL YT. FH
. SRREL, KACENS Fie. AL
RIEL REL EROIY - DS y IROOM +-p
VEVLEETHFERKEOKSITTS,
F5YI* FAK F—TTEAC MTT-S821R ist
BTCAL, 3,00H 24 EME S S.
F — FORE VERDPEERLTHETS.
6. ID DI y SHAFT ROM DS HNEUT ES
He: 0.29% RMS (JERR ARH IF)
on
4-6 j=78
EGASMAVRIRANSHOALRTSH.
SEALED U-—RZSERALEF,
AIL: TEAC TZ-255AE—% + 4-1 JL(TEAC
TZ-2559-1 JU Hy RAPD)
E-EWD+ TBAT STK KEI
#834 oo ,
FY—A:AP + W—IGWV/3, RRA AA
Li. DST VEO EMD 91/3 F 7 RRA, BEE ITT.
A Ju 1 AI, DOA I WHEE DAB Y + 1
QUVUVINSSATS.
2. HEOTU-ALKDSAKT IL NPUVFRIADIS,
TRUBIC IAP Be Ic BAAR
capstan flywheel ass’y
capstan shaft
weil of
flywheel
5 stan housin:
bearing cepeta ; 9
Apply a a drop of oil here
—~BiEBF S
Fig. 4-8
Fig. 4-9 Voltage conversion

5 ELECTRICAL CHECKS AND ADJUSTMENTS
PurAPROMR & aE
PRECAUTIONS 5-1 fi
. Since this deck has an automatic tape selector, be sure to use 1. BREST PUIS BARERBIC EO TORT OT,
test tapes that have tape position detecting holes. FARK F-—PALGF—-—D + RYVY a> PHLOHSH
. Before performing adjustments and checks, clean and. demag- DEBRLUTC EA,
netize the entire tape path, then check tape motion condition. 2. PYIRORMRORAIC, WHA EK, mR BAYE, +
i ie sure the deck is propedy: set for the voltage in your _JHTFAPENENERAWREL, 7U-TIECURAL
ocality, ees be Seifa Peni ier ee
. in general, adjustments and checks are made in the order of L-ch C7 JRTARERET Se é
then R-ch FIOBBOMURU, PBRUF oy 7lkL-ch, R-choin
Double REF. Nos. such as R12/R22 indicate L-ch/R-ch. FCI TRS.
. The AC volimeter used in the procedures must have an input MRI2Z/“R2MOA AIC PANCHOSHM ES IAL-ch’R-ch
impedance of 1 MQ or more. ERULET
. 0 dB is referenced to 0.775 V. 4. VAIL ADT VESVAIMOLLEOSOSBALTE
eh.
5. O0dB=0.775V
§-2 TEAC TEST TAPES
MTT-158: For Dolby level calibration
MTT-356: For playback frequency response check for CrO2,
METAL
MTT-256: For playback frequency response check for NORMAL
MTT-5571: For METAL record test
MTT-5561: . For CrO. record test
MTT-5511:. For NORMAL record test -
Oscillator
Oistortian Analyzer
Attenuator
LINE IN
OUTPUT
5-2 TEACT AF: aT
MTT-150 :
MTT-356 :
MTT-256 :
MTT-5571:
MTT-5561:
MTT-5511:
KES + DA ty bh
CrOg,METAL 3-0-3342 RBA A
NORMALS — JOB 4: Mik eHtE WE
METALF—JORBRT AA
CrOgF —-JORERT AKA
NORMALP— JORERT ARM
Oscilloscapea
AC Voltmeter
Fig.5-1 Basic testsetun SABER

10
ce | te ei
Fig. 5-2 Chack and adjustment points on MAIN PCB
Oscilloscope
Amp SPKR
DECK
under TEST
OUTPUT AC Voltmeter
Fig. 5-3 Test setup for azimuth check
Gira BS abe srl ba

tapes ;
For Dotby level cafibration
For playback frequency response check for NORMAL
For playback frequency response check for HETAL and Crde
For S/N check for NORMAL
ADJUST
(or CHECK)
Ee brgitsiag
Check
Azimuth screws
of R»P head
Be HAY EO
PIUVARBAY
(Fig. 5-4)
Ri2 / R22
R13 / R23
MEASURING POINT,
RESULT
WET + ABA
OUTPUT ¢L/R}
Phase : Within 45°
fg 45° LAA
OUTPUT {L/R} :
Phase between L-ch and
R-ch =: 0°
Maximumx output at L &
R-ch's.
L-R BIORBEA 0° TC
Boe ch hieAWA
REHARKS
fi 4
OUTPUT {L/R}
~§ dB ( 436 mV )
PEAK LEVEL meter (L/R)
0 dB (RED) lit
008 GR) RAT
Rit / R21
OUTPUT (L/R)
Nealy equal,
and 10 kHz
318 Hz & 10 KHZ OLN IEEE <
GOED RB
Standerd #8
output level ‘at 351 Hz
> Fig. §-8
Check
5-3. PLAYBACK PERFORMANCE
F3-4E FR
TEAC test
Deck settings HTT-150
Hode PLAY HIT-256
NR SYSTEM sw. OUT HIT-356
MPX FILTER sw. OUT MTT-5511
ITE SETTING INPUT SIGNAL
BIR mE AEA
MTT-159
1, REC + PLAY
head azimuth a eee
&+ BAYER Connect ion Fig. 5-3
PIUVA HTT-256 or MIT~356
{ 10 ktlz ) ;
. Playback ;
output level Same as above fal HTT-150
BERAVAIY
. Meter level
setting : a ;
L- 4 VAY Connection Fig. 5-1 MTT~150
eyb
. Playback
frequency ta Re MTT-256
response Connect lon Fig. 5-1 {HTT-356)
Fe aE
MIT-5517 ;
fully demagnetize
. Playback (i
8/N ratio Connect ion Fig. 5-1 petra tape
Be S/N it
(AULT + Ht CH
SHANK GO)
REC Head P/8B Head
BEN» KF BtkAv F
REC Head Azimuth Screw Height Adj. Screw
REC TU V AMERY Bde
P/B Head Tilt Adj. Screw
Azimuth Screw FI b Rae
P/BT VV AWAY
Fig. 5-4
(aby
+4
+2
°
-2
-4
63 9 IGwCHzb
Fig, 5-6 Playback frequency response
Fa AR IE
O°tin phase} 45°
age =I
POOR
OUTPUT (L/R)
S/N 450B min.
-5 dB ( 436 m¥ ) is reference level
BMV AILI£ 5 dB ( 436 mv )
180° (out of phase}
“Wa
90° 135°
Fig. 5-5 Confirming phase relationship
act
11

5-4. MONITOR PERFORMANCE
ER FR
Deck settings
Mode : RECORD/PAUSE {Except item 11 )
MASTER REC LEVEL cont. > Maximum
AUTO MONITOR sw. 2 SOURCE
NR SYSTEM sw: (OUT
NPX FILTER sv. ? OUT
SETTING INPUT SIGNAL Bi fcaeey ria POINT, REMARKS
RE AdES ot GIES) fi #
SP WEHM - HR
Min LINE
LINE IN {L/R} ; OUTPUT (L/R)
a
aad
Connection
:
Fig.
5-1
400
Hz
/
-19
dB
|
Check
-§
dB
+
3
dB
BW
DAAVAL
{
86.9
mv
) (
308
mv
~
615
mV
)
LINE IN (L/R) : PRESET cont,
400H2/-9dB (275m¥) 1 LZR)
DOLBY TP (L/R) :
. Specified -10 dB ¢ 245 mV }
LINE tnput level
LINE FEA
VAIL
Connection : Fig. 5-1
After adjusting, do not move the PRESET cont. (L/R). { Specific position }
HOR Bit PRESET DHEALHMAGIYCE, ;
[
8, MEter level ; © Ein Be LINE EN (L/R} : PEAK LEVEL meter ( L/R) :
X-46 Lag, | Comectton + Fig.d-1 400Hz/-9d8 (275avy | ChECK 0 dB (RED) :
» PHONES weer channet
output Jevel Connection : fig, 4 -7 LINE IN (L/R) : Check BF eRe
PHONES 7D PHONES LEVEL cont. Max. 400HZ/-SdB (275m¥) -15 dB +3 dB
UAW : ( 97.5 mY ~ 195 nv }
. CO level check | Connectton : Fig. $-1 LINE IN (L/R) : LED: Lit) axe
co * + STOP mode 400 Hz / -12 dB Check . PEAK LEVEL meter (L/R} :
VAIb+ Foy ich LEVEL CHECK sw, < Set ( 196 mV } 0 dB
oscillator
AC voltmeter
BECK unde test
PHONES 0477 7 Ren
INE TEST LOAD RESISTORS
Y 2 —tRGR
Fig. 5-7 Test setup for PHONES check K-—> WHAM -
Frequency Counter * — be edd
+a res == ZY Poe. = 2S Sei 7
MAIN PCB TP.5 ned ae aed H
+2
7)
“2
;+—_¢—_}
DECK. GNDe oe ae so
under TEST -3 Cosses= Jo bec cee nna
40 : 400 12,.5e (Hz)
Fig. 5-8. Test setup for bias osc, frequency adjustment
a ae a FRI RS AS HA Fig. 5-9 Overall frequency response
; $2 75 2) RISE
12

tte,
Center position,
> . Center position.
Max
INPUT SIGNAL
AMES
PR
PRE
ADJUST
{or CHECK)
Btls
LINE IN ( LAR) :
400 Hz and 10 kHz
alternately /
ABS /
-42 dB ( 6,15 WV }
LINE IN € LAR} :
10 KHz / -42 dB
{ 6.15 mv }
5-5. RECORDING PERFORMANCE
TR ES FR
Deck settings
MASTER REC LEVEL cont. :
AUTO MONITOR sw. oo: TAPE
NR SYSTEM sw. : OUT
HPX FILTER sw. OUT
BIAS (1/8 } cont. :
LEVEL € L/ R } cont,
ITEM SETTING
SRB Rm
11. Bias ose Connection Fig. 4 -8
frequency Tape MTT-5571
KRIPA Hode REC/ PAUSE
FARE
12, Record E@ nee
BS 0
tae _y | Connection Fig, 5-1
"8. peg Tl Tape: MIT-5971
ty b BIAS cont. Center
LEVEL cont. < Center
14. Record azimuth
BEVLVVA ”
( ¥-970X )
Connection Fig, 5-1
15, Recored bias -2 | TAPE : MIT~S5511.
- WE PA«vyb | BIAS cont. Center
LEVEL cont, : Center
“Connection Fig. 5-1
16. Record level TAPE MIT-S511.
BBVA Connection : Fig. 5-1
TAPE HTT-5571
Connection Fig, 5-1
5 : TAPE MTT-5871
17, Total harmonic
distortion TAPE HTT-5561
hr.
REX Connection ; Fig. 5~1
TAPE HTT-5511
18. Overati Connect ion Fig. 5-1
frequency TAPE MTT~5871
response TAPE MTT-5561
SF Fa a CE TAPE MIT-5511
LINE IN ( L/R) >
400 Hz and 10 kHz
alternately /
Ras /
42 dB ( 6.15 mV )
LINE IN € LAR):
400 Hz / -12 dB
( 195 aV )
LINE IN (¢ LAR ) :
400 Hz / -12 4B
( 195 oV )
) Azimuth screw of
Ut23
R14 / R24
R17 / R27
REC head
BENY KOPY
VARRAY
( Fig. 5-4}
Check
( R17 / R27 )
R15 / R25
R16 / RIG
Check
LINE IN { L/R) :
40 Hz ~ 12.9 KHZ /
-42 dB ( 6.15 nV }
Check
TEAC recording test tapes
MTT-5571 For METAL
MiT-5561 For crd2
HTT~5511 For NORHAL
MEASURING POINT
' REMARKS
RESULT ii #
MEUM - SRE
100 kHz 2k kHz
Set to center position
CYA-MEK ITS
OUTPUT ( L/R )
Equa! output leve! ( record and
playback } between 400HZ and 10 kHz.
400 Hz & 10. KHZ OWBBWAMSELCS
Ace
OUTPUT ( i/R}
Phase between L-ch/R-ch :
o
L- R MOWBEM O° TC
. BOB Fr evABAA
OUTPUT ( L/R }
fqual output level { record and
playback ) between 400Hz and 10 kHz.
400 HZ & 10 KAZ ORBWAMELKS
act
Refer to
Fig. 5-5
OUTPUT { L/R)
Output level ( record and playback }
BBwA
-8 dB ( 300 mY }
OUTPUT ( LAR) oo: .
2.0% or less
2.0% KE
OUTPUT ( L/R) :
2,5 % or less
2.5% XE
OUTPUT ( L/R }
Standard Fig.5-9
13

4
MEASURING POINT,
RESULT
REM - MRA
OUTPUT ( L/R }
ADJUST
{or CHECK)
me
ITEM
MAA
SETTING
RoE
REMARKS
ff #
INPUT SIGNAL
INES
45 dB min.
r Oo 45 dB min.
NORMAL 44 dB min.
METAL
C
Connection Fig. 5-1
TAPE : WIT-5571
TAPE : HIT~5561
TAPE > MIT-8511
19. Overall
S/N ratio
BA S/N it
400 Hz / -9 dB ( 275 m¥ ) is the
reference levei.
WEL As 400 Hz / -9 GB OC 275 mV )
Connection Fig. §-1
LINE IN ( L/R) :
ee a
20, Erase efficiency | TAPE : HTT-S577 pis
HAW
Record a 1 kHz signal. Erase thr latter hatf of the recording, Rewind and piay to fined the difference between
the 1 kHz portion and the erased portion.
BERASBELKHOVAVEREVAIVEL, BERD EMALABOMNLAV CORRE.
Same as above OUTPUT { U/R )
a 65 dB in. ratio |
Same as above
fal
21, REC MUTE
function
REC MUTE =)B
Record a 1-kHz signal, Push REC MUTE bitoon midway. Rewind and play to find the difference between the 1-kHz
portion and the "rec mute” portipon.
1 kW? BSCBEU, PT RE MUTE MAHL TRHESREMA CHS.
COF-FEBEL, 1 kHz MPLRESHMRCOMALVAVESHE,
LINE IN :
Same as above L ch any eae OUTPUT {R)
fa] £ R ch No signal 30 dB min. ratio
Ries
22. Channel! Set the deck to record mode, Rewind and play to find the difference between the 1-kHz recorded portion ( 1-ch )
separation and " no signal “ portion { R-ch )-
Ce Se, ELT 1-kH2 BB ( L-ch ) ERMESH ERB (Reh) EOWAVALESHME.
Ne-YVay :
Change the above connection and check reverse operation a! so.
L-ch & R-ch SANBAKBAKOMTEF ry 7tSce,
Connection : fig. 5-1 ae Mo signal
but do not connect LINE (t) ee
. and OUTPUT (L) i
OUTPUT (R)
: 40 dB min. ratio
23, Adjucent track R ch 125HZ/-94B :
crosstalk Lch OANAOBRRAR (275m¥)
hoy 7g ——
POARKZ Record a 125-Hz signal on R-ch track and note output level. Invert taped and piay R-ch track. Check leakage
level against the output reference of previously recorded porton.
R-ch Bay Zk 125 hz REL, TOBEHASBELALETS.
Ricr~TeREL, BELABO R-ch HAVAVERBLAILLEORECHE.

PARTS LIST SECTION
NOTES:
1.
As regards the resistors and capacitors, refer to
the circuit diagrams and the PCB ass’y drawings
included in this brochure.
. Parts marked with A this sign are safety
critical components. They must always be
replaced with identical components ~ refer
to the appropriate parts list and
ensure exact replacement.
it &
1. @#oRM, ry Fv AeLTHVET. DRE
UBREEBRLT CRS
2, AMMISKSHRBERATT. BTS C SAAT SF 17
»y PEORALHALTE Et.
ts)

V-870
6 EXPLODED VIEWS AND PARTS LIST
YAP
QMS
EXPLODED VIEW-1
16

EXPLODED V{EW-1
REF. NO.
PARTS NO.
A*5 | 28027000
A*5 [28047000
A*5350008 300
4*535001 0700
4*5350010800
A*535001 | 700
DESCREPT ION
CORD, AC [J]
CORD, AC [UK]
CORD, AC [A]
CORD, AC SPT=2 [US,C]
CORD, AC SPT-I [GE,MIL}
CORD, AC CLASS-2 [E]
I- 2 A*53{7003400 BUSHING 2271
i- 3 *5800956700 COVER, TOP
i- 4 *5200225000 VOLTAGE SELECTOR PCB ASSY IGE,MIL]
I- 5 *5800835002 PANEL, REAR(B)
I- 6 *5800612400 SCREW, BONNET; M3X8 (BLK)
\- 7 ¥5200224900 POWER SW. PCB ASSY [J,US,C,GE,MIL]
¥5200224910 POWER SW. PCB ASSY [E,UK,A)
1- 8 *5800953600 ROD, POWER SWITCH
I- 9 5800957400 BUTTON (E), POWER
I-10 *5200241800 DISPLAY PCB ASSY
I-1! *9200241400 JOINT PCB (A) ASSY
f-|2 #5200224400 JOINT PCB {(B) ASSY
I-13 5800952700 KNOB (A), VOLUME
baa 5800952800 KNOB (B), VOLUME
t-15 *5800809402 CHASSIS, {L)
I-16 *5801007200 FOOT ASSY
|-17 *5791234130 SPRING, 2341-30
I-18 5800957500 BUTTON (C), EJECT
[-19 5800961500 KNOB, (A); SWITCH
|-20 *5 200241500 TIMER SWITCH PCB ASSY
1-21 *5800740701 ARM, EJECT
|~22 *5800775200 SPRING, HOLDER(B)
1-23 *5800744500 SHAFT, HOLDER
1-24 5225015100 LED, SLF30IC
1-25 5800620500 DAMPER ASSY
|-27 *5200241300 MAIN PCB ASSY
1-28 *5200241600 JOINT PCB (C) ASSY
1-30 58009535201 BUTTON, PUSH
|-3] *5200225300 JACK PCB ASSY
1-32 *5800952000 WINDOW, FL DISPLAY
1-33 - *3800954400 BRACKET, PCB
{~34 A 5320045000 TRANSFORMER, POWER [J}
& 5320045100 TRANSFORMER, POWER [US,C]
. & 5320045200 TRANSFORMER, POWER [GE,MIL]
& 5320045300 TRANSFORMER, POWER [E,UK,Al
[-35 *5800954200 BRACKET, TRANSFORMER; POWER
[+36 *580080930} CHASSIS, (R)
1-39 *5801048700 ESCUTCHEON ASSY (C), FRONT
|~40 5800952900 VOLUME KNOB ASSY (C)
1-4] 5800603801 SPRING, CASSETTE PRESS
|-42 *5800739202 HOLDER, CASSETTE
p43 *5800953400 PLATE (B), HOLDER
)-44 5800759301 COVER, CASSETTE HOLDER
1-45 *5800809601 COVER, BOTTOM
1-46 *5210225100 TRANSFORMER PCB (1)
\-47 *5210224500 TRANSFORMER PCB (2)
[-5| *5783613008 SCREW, C-TITE M3X8 (BLK NI)
[+52 *5783543008 SCREW, BIND P-TITE M3X8 BL
[-53 ¥*5783693006 SCREW, BIND S-TITE M3X6 BL.
|-54 *5783693008 SCREW, BIND S-TITE M3X8 BL
|-55 *5783043008 SCREW, FLAT S-TITE M3xX8
t-56 ¥5783073006 SCREW, PAN S-TITE CUP M3X6
|-57 *5 783074008 SCREW, PAN S-TITE CUP M4x8
[USi:U.S.A. [TE}sEUROPE [UK1:U.K. {C]:CANADA
[AIt:AUSTRALIA LGEI:GENERAL EXPORT [JI:JAPAN [MIL}:US MILITARY
Parts marked with *require longer delivery time.
Ref.
Ref.
Ref.
Ref.
Ref,
Ref.
Ref.
Ref.
Ref.
Ref,
pages
pages
pages
pages
pages
pages
pages
pages
pages
pages
24
24
24
23
23
23
24
22
22
24
& 27
27
27
26
26
26
27
25
26
27
17

V-870
EXPLODED VIEW-2
oy
a
Lag
ZX
a),
ee
Vielen
f 2

EXPLODED VIEW-2
REF. NO.
PARTS NO.
*5800 768700
*58006 16300
*5800616400
*5800731700
*5800755800
*5800595602
530753500
*5 200182400
*5800594000
*5800955 100
5378904900
5800935 | 40 |
*580093 | 300
¥*5800955900
5800956000
5800955200
5800955700
*58004 | B400
5800595701
*58005 95500
*55 40055000
#5801005 700
*5800957200
Yacant
5800955400
5800955800
*5800953900
*5540056000
*58006 1 8202
*5800737200
*5800620000
¥#58006 19900
580059580!
*580095 3800
*5 80095 4000
*5786003000
*5 783032604
*5783032005
*5 783002605
*5780022008
*5 7801 12008
*5780002005
*5 786710300
*578 1952600
*5800978900
*5780132605
¥*5 786002000
¥*5 785032606
*5 783043008
*5785313100
*5 785313000
*57867 13000
DESCREPT | ON REMARKS
LEVER, CASSETTE LOCK
SPRING, LOCK LEVER
SPRING, EJECT PREV. PLATE
BRACKET ASSY, SW. ARM; (L)
SPRING, PRESSURE ARM
ARM, SWITCH PRESSURE
SWETCH, LEAF; LSA=2125
SENSOR PCB ASSY
BRACKET, (R)
COYER, ERASE HEAD
Ref. pages 24 & 27
HEAD, ERASE; HAJWB3507A
HEAD ASSY
SPRING, HEAD
BRACKET, HEAD
GUIDE, TAPE
ARM ASSY, PINCH ROLLER (L)
SPRING, P{NCH ROLLER (L)
SPRING, ARM; P{NCH ROLLER
GUEDE, CASSETTE (L) ,
SPRING, PRESSURE
BALL, STEEL P{ 2
SPRING, HEAD BASE
BASE ASSY, HEAD
ARM ASSY, PINCH ROLLER (R?}
SPRING, PINCH ROLLER (R)
BRACKET, MECHANISM; (B)
BALL, STEEL PI 3
SLIDER ASSY
SPRING, LOCK
ARM ASSY, BRAKE (L)
ARM ASSY, BRAKE (R)
GUIDE, CASSETTE (R)
BRACKET, MECHANISM (A)
CHASSIS ASSY, MECHANISM (D)
BRACKET, MECHANISM (C)
WASHER, EeRING E-3 (J1S)
SCREW, BIND S=TITE M2.6X4
SCREW, SIND S-TETE M2xX5
SCREW, PAN S-TITE M2,6X5
SCREW, BIND M2X8 (BLK.NI)
SCREW, PAN M2X8(NL)
SCREW, BIND M2X5
HARNESS CLIP, 2X4.5xX42
NUT, NYLON M2.6
WASHER, 2.9X5X0.8T
SCREW, PAN SEMS (A) M2.6X5
WASHER, E-RING E~2 (J1S)
SCREW, BIND S-T£TE M2,.6X6
SCREW, FLAT S-TITE M3x8
WASHER, POLYSL. 3X9X0,5T
WASHER, POLYSL. 3X6X0.5T
CLIP, HARNESS 3.0X9. 1X50
Parts marked with *require longer delivery time,
19

| V-870
EXPLODED VIEW-3
@
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Xx
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4
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2
3
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20