*TROUBLE SHOOTING PROCEDURE (Reter to the circuite diagram and printed circuit board)
Symptom Foully
Circuit Trouble ond couses Corrective oction
Bolh tope
ond rodio
bod
No sound
ot oll Power
supply
circuit
a5horf ot dls.pnneclicn in filler choke 010-082-001
fShort or disconnection in choke 009-045-000
ODefect or decective soldering in poss-throulh copocilor
cT3 (040-008-000)
lFoulry contocls or mechonism of SWr (013-269-000) or SWr
fBod connection of power supply cord
aDisconnection of Rrsr
Reploc e.
Reploce.of repoir
soldering
Repl oc e.
Repoir cord
Repl oc e.
No sund
from one of
the chonnel
Output
circuit
lDisconnection of speoke.r voice coil
ODefect or defective soldering in poss-lhrooth copocitors
CTr or CTr (040-008-000).
lDisconnection or defeclive soldering in Ce: or Cu:
fDisconnection or short in output tronsistor 258367.
fDisconnection or dcmcge in R;o or R;1 (R1ss o! Rrrr).
Reploc e.
Reploce or r€poir.
solde ri ng
Repl oc e.
Driver
circuil
f Disconn:ction or short in primory or secondory of inpul
tronsformer 006-066-001.
lDisconnection or short in 2SC28l or 2SC458L
lDisconnection or copocity drop in Cr; or Cro; Repl oc e
Reproduced
sound i s
weok
Output or
driver
circuit
lCopocity drop in C6e or C112
fDefective 258367
(tDe{ecrive 2Sc458t or 2SC28l
fDisconnecti66 er copociiy drop in Ciz (Croe)
llncreose if resistonce in Rro or Rrro
Reploc e,
e^.,-J ;-
)efect or poir domoge in 258367
refective 2SC458L or 25C281
k ..-. .- ^ -. ^ - t- ^.. a
Reploce
distorted driver circuit efects in thermistor Thl, Thr, Th3, or Th, (002-014-C00)
isconnecfion or shcrt in R66 or Ree (Rrro or R116)
isconneclion or short in R67 or Rcs (Rlrr or R11e)
isconnection or short in R61 or Ro: {Rrrr or R112}
Vibrotions Output or
driver circuil
lCopocity drop or disconnection in C153, C'rn, Ctr.
Oshcrt or chonge in resistonce of R15:r
fShorr or defective soldering or screw thghtening in ground
Poi nt
ODisconneclion in C56 or Cros
fShorr or chonge in resistonce in R65 61 1115
ODisconnection in C66 or Crr (Crro or Cl11)
Reploce.
Reploce solder ot
tighleen screw
Re p Ioc e.
Rodio is
usuol,
slereo is
bod
No sound
ot oll Motor
circui I
)Short in Crrr
)Defective motor 020-018-000
)Foulfy contocls or mechonism in SWg (013-269-000)
)Disconneclion in R151
)Short in C151 or C152
Re ploc e.
No sound
from one
chonnel
No sound
ol oll
fHeod leod wire disconnected
ODisconnection in Csr lCror)
aDisconnection or short in 2SC458L-G or 2SC458L
ODisconneclion in Cg (Cros)
fDefective connections or domoge ih:Vh-l or VR-2
fDisconnection. in Rso (Rros)
ODisconneclion or shcrts in oiher bios resislors
Repoir or reploce.
Rep loc e.
Noise
di slorli on
lniliol
coupling
circuit
ODefective 2Sc458Lg or 2SC458L Repl oce.
Vibrotions fDefective soldering in heod leod wire
fDefective reproducing heod 0l l-016-000 Reodiu st
No lreble lHeod ozimuth defective
lHeod is dirty or defeclive
fCopocity chonge or disconneclion in Crr {Croz)
lShort in Rco (Rroo)
Reploc e.
Cleon or reploce
Reploc e.
Heods con
not be
chonged
Plunger
circuit
)Foulty confocts or mechonism in plunger swith 0,l2-285-000
)Reor short in plunger coil
)lnternol resin deformed by plunger heot
)Georino of comshoft ond com rotchet defective
Reploc e.
Repoi r.
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