Technics SH 9090 Service Manual

Page 2

l LOCATION OF CIRCUITS

POWER TRANSFORMER

FUSE

POWER SOURCE CIRCUIT

AUDIO FREQUENCY AMPLIFIER CIRCUIT
RELAY OF MUTING

SUBTRACTION AMPLIFIER CIRCUIT
ADDITION AMPLIFIER CIRCUIT

AUDIO FREQUENCY AMPLIFIER CIRCUIT
BUFFER AMPLIFIER

10 RELAY OF EOUALIZER SELECTOR

ll. BAND PASS FILTER CIRCUIT

SPOONPUPPN.

I ALIGNMENT INSTRUCTIONS L; --~'-'-.4-,;4'~_:~___*- .-.i._.*..m - 1 _:..3
W _ ~ _ :1 _- _ _- w__fil
i I \ a. r a *- u: r H - : : a 5 :,_ my.
I
fl. 3.55245 7?? .2 357?? .3317! iii? _ _;.=_ 33:13:: :4
__ ~ ~ I T ' 3- my; < a» It- CANE 4 .,_. tt- £23?
Alignment Points 3 f if: ;5§§;.-urf§13245f7_":j_*j3. c
FREJUEMV CISCILLQ tr \W
o This unit should be re-adjusted when capacitors or resistors (especially the volume) (0 Q O 0 Cf PEI
are replaced. I99 an 00 ; n r
O A perfectly complete and very precise measuring instrument is required for ad- i-L)
justment of this unit. It is especially necessary to use a frequency oscillator which :QEQUENCV WNW
oscillates a stable signal for each individual frequency. E
o For adjustment of this unit. turn the power switch on and the equalizer selector to (-w
the W" position. mpu.
Note that about 12 seconds are required, after turning the power switch on, for the j 5H-ngo
equalizer circuit to operate. IIoI é ca mm o
0 Refer to figure 2 for information concerning connections of measuring instruments. II I ©
0 Follow the steps described below before beginning adjustments. IljI will °
* Main level volume...0. U ..
* Individual frequency level volume...0 dB. 434 , 27".
* Frequency variable volume...middle position. #7 56m WE
* Band-width volume...narrow. JF'Q'
* Standard input voltage (each frequency)...OdB in the 1V range (0.775V) CONNECTIONS 0F
MEASURING INSTRUMENI

(Fig. 2)
SH-9090