Teac V-870 - Record Azimuth Adjustment; Overall S;N Ratio Measurement; Erase Efficiency Check

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.