Marantz 75DC1010/1B - Page 22

O88 N14 7 ZARB RU HX A HRS
1) [METAL] BLY av CRERBL LET.
2) BARPIOZ LMFAhRAY bIOLKIOPFOIY PVT
PL
CHERBKERLET.
(ARRAVYIY-RUAY
maAa-7)
3) ANA TARRADRM* 10SKHz & ES LF BRPIOZ LOK
deat VLLOIZHMBLET.
4)
RICHX
24
VL)
L901,
R)L902ZHMBL.
FARRAY
hTLOI(L,
RMAORDAKADEET.
OSB FHS
1)
BBEBSVAVPOSADVUNAVERK—
25dBRMUE,
1
KHz
&
12.5KHz
0185
&
DOLBY-C
®VY
3
v
CHE
LE
to.
(NORMAL
7—
7
ACC224)
2) BRRLBAL,Y 1 KHz 12.5KHz9O2 FO VAV EM
O~+1.0dBER 445, RPI LOMB FREER
L) R901, R) R902 +HBLET.
3) CrO2, METAL ClISHHROALTEVE TF.
OBB BEL NILES
1) NORMAL —7/ ACC224 (2 CT SHVESRE ARE L LL E=
J—VNVEOBELET.
2)
BXRLBEAL.
1
KHzOVAVS+LOSIBUNE
RSL
3.
PDO3
Hib
OF
AE
HRHL
L)
RKO1,
R)
RKO2
EABLET.
3) CrO2, METAL Clt 1 KHz C+ 1dBUNCHSCE DE
BOA RITEVET.
ADJUSTMENT POINT COMPONENT SIDE
r | I
we
Taev ise
Ht |
Seif] ]°
=) lr
(0) wee
eae
Tine
eer rreveFoev77300/220"
——.
u207
Vwevs22eWenisysereY
eooooo0o$97
eo oo 8 8 9
7
WA294K 101-0
Oo eva «OO
en eee REC LEVEL RCH
RO 1602°e
Rut3 7.60!
REC LEVEL LCH
RKO}
WA294K102-9 PD03O
P.B LEVEL LCH L6OI
Oo
PCS 79 716
2b}
7.5 RECORDING BIAS FREQUENCY AND HX COIL
ADJUSTMENT
1) Operate to REC mode at METAL position.
2) High impedance through test point JJO1 on the PCB
(PJ03) and connect to measurement. (FREQUENCY
COUNTER and OSCILLOSCOPE through AUDIO
VOLT METER)
3) Adjust a bias-oscillated coil LLO1 on the PCB (PJO03) to
be 105 kHz bias-oscillated frequency.
4) Then, adjust HX coil L/L901, R/L902 to minimum the
output at test point TLO1 (L/R).
7.6 REC/PLAY-BACK FREQUENCY RESPONSE
ADJUSTMENT
1) Decrease -25 dB INPUT LEVEL from S.R.L setting.
Record 1 kHz and 12.5 kHz signals at DOLBY-C
position. (NORMAL tape/position)
2) Adjust semi-fixed resistor L/R901, R/R902 on the PCB
(PJO3) that the level of differences 1 kHz and 1.25 kHz
should be 0 ~ +1.0 dB.
3) Only check CrOz and METAL tapes/positions.
7.7 REC/PLAY-BACK LEVEL ADJUSTMENT
1) By NORMAL tape/position, set O.R.L setting and set
monitor level scale 0 dB.
2) Do REWIND and PLAY it and adjust semi-fixed resistor
L/RK01, R/RKO2 on the PCB (PDO3) to be 1 kHz level
within + 0.5 dB.
3) Only check CrOz and METAL tapes/positions. In these
case, to be 1 kHz level within +1.0 dB.
7 |_| = Pope t fe 4
—=—— ao of sl JRO2 sf2 9 © 0 0 0
P NJRO IGS oe gq Jwo 0
ool fp fiett.! Ptbris:
“ preereennny|
oO
R902
LLO! BIAS RCH
R901
Tus
HI-SPEED
£4
2 Rey,
BIAS LCH|s
SPEED L390)