Sony SLV-D940PAZ / SLV-D940PEA / SLV-D940PME Service Manual ▷ View online
7-1
7. TROUBLESHOOTING
No Power Detected
(stand by LED OFF)
F1SS01 is normal?
D1SS11, D1SF02
SHORT and OPEN
are normal?
Check feedback IC1SS2
Change short circuited or
opened parts
Change fuse
Check 2'st Voltage and D1SS12
Replace SCS11A
NO
NO
Is there voltage at
Collector of
SCS11A
NO
YES
YES
YES
Operation of
SCS11A is
normal?
NO
YES
Key Operation or
Remote Control Error
Is the measurement of
power with in normal value?
is the SMPS to Main connector
properly connected?
End repairs
Check power and front connector
Check the circuity around the clock
Check the circuity around
IC601 reset
Check the soldering around the
IC601
Change IC701
NO
NO
Key operatious such
as STOP,PLAY,OPEN
are normal?
Check the circuity around the swith.
check the condition of commmunication
with Main Micom
(IC601-11; SCLK, 12; TXD, 13; RXD,
52; RRQ, 66; SRQ)
NO
YES
YES
Check the circuity
around IC601 reset?
Check the soldering
around IC601 good?
NO
YES
XT602 8MHz
oscillation is normal?
NO
YES
YES
STOP,PLAY,OPEN
Key operatious are
normal?
YES
SLV-D940P AZ/D940P EA/D940P ME
7-2
PLAY MODE
INOPERATIVE
EE-VIDEO
INSERT THE CASETTE
TAPE RECORDED BY
ANOTHER VCR AND
PRESS PLAY BUTTON
PLAY
INDICATOR
IN THE DISPLAY
PRESS PLAY KEY
IN REMOTE
CONTROL
MECHANISM
OPERATION
SEE (PB VIDEO) AUDIO MISSING
IN PLAY MODE
SEE
(MECHANISM DOES NOT
OPERATE IN PLAY MODE)
CHECK TIMER
CHECK
IC601, XT602
SEE
(VIDEO MISSING IN EE MODE)
NO
NO
NO
YES
NO
PB-VIDEO
SEE
VIDEO MISSING
IN PLAY MODE
NO
YES
YES
YES
DOES NOT OPERATE
OR OPERATES
BUT STOP SOON
YES
(VCR Section)
LOAD A TAPE AND
PRESS PLAY BUTTON
TURN VCR POWER ON
MECHANISM DOESN'T
OPERATE IN PLAY MODE
TAPE LOADING
OPERATION
(LOAD)
IC601-75:LOW
CYLINDER
ROTATION
SW 25Hz
IC601-24
CYL FG.PG
IC601-97
CHECK CYLINDER
CHECK
START (S602)
IC601
NO
NO
NO
NO
YES
YES
YES
YES
CHECK CN604
pin8 12V
(VCR Section)
A
7-3
CAPSTAN
ROTATION
(S.T REEL)
IC601-98, 99
PROG.SW STATE
IC601-76, 77, 78
CHANGE IC601
CHECK
LOADING MOTOR
MECHANISM OR SW601
TAKE UP REEL SENSOR
SUPPLY REEL SENSOR
(PT601.PT602)
SEE
(CAPSTAN DOES NOT
ROTATE)
NO
DC
STOP MODE
YES
PULSE
YES
A
RECORD MODE
DOESN'T OPERATE
PLAY
OPERATION
LOAD VCR WITH A
BLANK TAPE AND
PRESS RECORD BUTTON
REC MODE
SAFETY TAB
D-REC A (H)
IC601-68
SEE
(AUDIO MISSING IN
RECORD MODE)
CHANGE SW602
CHECK IC601
CHANGE TAPE
SEE
(PLAY MODE
DOESN'T OPERATE)
EJECT
NO
NO
YES
NO
REC-VIDEO
SEE
(VIDEO MISSING IN
RECORD MODE)
NO
YES
YES
YES
YES
(VCR Section)
7-4
LOAD TAPE AND
PRESS F.FWD BUTTON
FAST FORWARD
DOESN'T OPERATE
F.FWD
INDICATOR IN
THE DISPLAY
PRESS FF
KEY IN REMOTE
CONTROL
MECHANISM
STATE IC601-76, 77, 78
CHECK TIMER
CHANGE IC601, XT602
NO
STOP
NO
NO
YES
CAPSTAN MOTOR
ROTATION
SEE CAPSTAN DOES NOT
ROTATE
SEE MECHANISM DOES NOT
OPERATE IN PLAY MODE
YES
F.FWD
ROTATE
CHECK
MECHANISM
(VCR Section)
FWD SEARCH DOESN'T
OPERATE
PLAY
OPERATION
PRESS F.FWD FOR
FORWARD SEARCH
CHECK IC601
CHECK CAPSTAN
MOTOR
IS CAPSTAN
SPEED CHANGED?
SEARCH
OPERATION
NOISE BAR
LOCKING
END
ADJUST
A/CE HEAD
CHANGE DECK
CHANGE IC601
SEE
(PLAY DOESN'T OPERATE)
NO
NO
NO
YES
NO
(CONTROL PULSE)
IC601-89
NO
YES
YES
YES
YES
(VCR Section)
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