Technics RS-CH770 - Schematic Diagrams

RS-CH770 |
m Schematic Diagram
Page
A
MAIN
CIRCUIT
2:seeccsccch
cen
cece
teesi
sisi
aeteaveritanebe
certs:
19~22
[E]
MECHANISM
CIRCUIT
(DECK
1)
.0......::ceceieeeeieeeseeesessenenernne
21
[eo]
MECHANISM
CIRCUIT
(DECK
2)
.........scsessseseeseeeeeessteettesesssssseeess
21
[PE]
POWER
SUPPLY
CIRCUIT
|...
ceeeeeseeeneeeeseittetesnaneneren
22
[2]
OPERATION
CIRCUIT
........ssssccecsssteccesteeeeessnneeeeeneetessneeesssineneen
23
@
This
schematic
diagram
may
be
modified
at
any
time
with
the
development
of
new
technology.
Notes:
@$900- - Stop switch (MH)
@S901 : DECK 2 cassette holder open switch (& OPEN)
©S902 : One-touch tape edit switch (TAPE EDIT/HIGH)
®S903 ; One-touch tape edit switch (TAPE EDIT/NOR)
@S904_ - Record pause switch (® REC PAUSE)
@$905_ - Dolby noise reduction switch (DOLBY NR)
eS906_ .: Fast forward/tape program sensor switch ( 3)
©S907_ : Forward side playback switch (B>)
@S909_ - Reverse side playback switch (~d)
@S910 ; Rewind/tape program sensor switch (<< )
@S911 ; Reverse mode select switch (REV MODE)
@S912 ; DECK 1/DECK 2 select switch (DECK 1/2)
®S913 : Counter display switch (COUNTER/DISPLAY)
S914 — ; Counter reset switch (COUNTER/RESET)
©S915 : DECK 1 cassette holder open switch (& OPEN)
@S951 : DECK 1 mode detect switch
®S952 - DECK 1 half detect switch
®S953 . DECK 1 CrO2 tape detect switch
@S971 : DECK 2 mode detect switch
@®S972 : DECK 2 half detect switch
@®S973 : DECK 2 CrOz tape detect switch
©S974 : DECK 2 reverse side record prevention tab detect switch
e@S975 : DECK 2 forward side record prevention tab detect switch
@®S976 .DECK2 METAL tape detect switch
@®VR101 : DECK 1 Playback gain adjustment (R-ch)
@®VR102 ; DECK 2 Playback gain adjustment (L-ch)
@®VR103 : DECK 2 Playback gain adjustment (R-ch)
@VR104 : DECK 1 Playback gain adjustment (L-ch)
®VR801 : DECK 1 tape speed adjustment (normal)
®VR802 ; DECK 2 tape speed adjustment (high)
®VR8O03 : DECK 2 tape speed adjustment (normal)
@ Indicated voltage values are the standard values for the unit measured by the DC electronic circuit
tester (high-impedance) with the chassis taken as standard. Therefore, there may exist some errors in
the voltage values, depending on the internal impedance of the DC circuit tester.
No mark: Playback ( ) : Recording
® Important safety notice:
Componenis identified by AY 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. When replacing any of components, be sure to use
only manufacturer's specified parts shown in the parts list.
® Caution!
IC and LS| are sensitive to static electricity.
Secondary trouble can be prevented by taking care during repair.
Cover the parts boxes made of plastics with aluminum foil.
Ground the soldering iron.
Put a conductive mat on the work table.
Do not touch the legs of IC or LSI with the fingers directly.
© Voltage and signal line
oweepeneees © Positive voltage line mum © Playback signal Line { > : Recording signal Line
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