Technics SAGX 550 Service Manual

Page 22

VSA-GX550

ISCHEMATIC DIAGRAM (Pans list on page; 52~58-)

(This schematic diagram may be modified at any time with the development of new technology.)

Note 1:

- 8701- : Voltage adjustment switch in 220-240V
position.

0 $946 : Numeric (5) switch.

.5947 : Center level adjust (CENTER LEVEL -)
switch.

- $948 : Test signal ONIOFF (TEST) switch.

0 $949 : Numeric (4) switch.

I 8950 : Numeric (6) switch.

'3951 : Center level adjust (CENTER LEVEL +)
switch.

0 $952 : Numeric (7) switch.

05953 . : Rear level adjust (REAR LEVEL -) switch.

0 $954, 955 : Input select switches.
(8954: CD, 8955: TUNER]

0 $956 : Center mode select (CENTER MODE)
switch.

- $957 2 Numeric (9) switch.

- $960 : Rear level adjust (REAR LEVEL +) switch.

0 $961 : Numeric (8) switch.

- 5962 : Numeric (0) switch.

- $963 : Delay time (DELAY TIME) adjustment.

- 8964 : Input select (PHONO) switch. .

~ $965 : Loudness (LOUDNESS) ONIOFF switch.

I 3966 : Memory (MEMORY) switch.

0 $967 : Muting (MUTING) switch. -

I 8970 : Tape/DOC monitor (T APE/DCC -)
switch.

- $971 : Input select (VCR2) switch.

~ $972 : input select (VCRt) switch.

. $973 : Speaker select (B) switch.

. $974 : FM mode select (FMVMODE) switch.

- $975 : Band select (BAND) switch.

0 $976 : Direct tuning (DIRECT TUNING) switch.

- $978 : Power (POWER) switch.

0 $980 : Dolby pro logic 3 STEREO ONIOFF
(3 STEREO) switch. .

~ $981 : Speaker select (A) switch.

0 $982 : Dolby pro logic surround ONIOFF
(SURROUND) switch.

0 $983 : Numeric (3) switch.

- $984 : Numeric (2) switch.

. S985 :Numerlc (1) switch.

- $986 : Tuning mode (TUNING MODE) switch.

. Si'gnal line

uncut) -: FM 080 signal

nun} : AM (MWILW) OSC signal

: Rec out signal (Lch)

mama : Rear speaker drive signal (Lch)

- : Positive voltage lines

: Negative voltage lines

: FM signal

: AM (MWILW) signal

: AF signal (Lch)

: Center speaker drive signal

. Important safety notice
Components identified by A mark have special
characteristics Important. for safety. Furthermore,
special parts which have purposes of fire-retardant
(resistors), high-quality sound (capacitors), low-noise
(resistors), etc. are used as occation calls. When
replacing any of components, be sure to use only
manufacturers specified parts shown in the parts list.

a

oThe supply parts number is described alone in the
replacement parts.

Part No. Original Part No.
2891 RCDH027&E

Supply Part No.
RCDHGZ75

- All voltage values shown in circuitry are DC voltage in
FM signal (Stereo signal) reception mode.

*Figures in ( ) stand for DC-voltage in AM (MWILW)
signal reception mode.

*Fl'gures in E 1 stand for DC-voltage in LW signal
reception mode.

' Caution!

Id and LSI are sensitive to static electricity.
Secondary trouble can be prevented by taking care
during repair.

~Cover the parts boxes made of plastics with alminum
toil. .

- Ground the soldering iron.

0 Put a conductive mat on the work table.

-Do not touch the legs of IC or LSI with the fingers .
directly.