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HITACHI HT-464
Inspection 4
Inspection 7
Does platter rotate when
Refer to 'Tone arm
power switch is set to ON
does not perform
with tone arm at arm rest
Are other operations OK?
FNO 6) auto-in operation"
position?
Y YES
under Inspection 2.
=
;
NO
Tone arm returns when arm
s
bottom panel mounte
Mount securel
lifter button is set to DOWN,
properly?
2
raha
|
and tone arm brought to
yes
_| Adjust return
rs YES
innermost part of platter by
*|
sensitivity.
-
-
hand?
°.
ls sensor holder mounted
NO »|
Mount it onto unit
J
L properly on unit plate?
plate properly.
¥NO
y YES
Adjust return
Proceed with inspections 2
peabcsdee &
and 3.
¥NO
Check voltage at R26, R27
intersection:
NO
About 70 mV with 33-1/3 rom;
[>
Perform Inspection 1.
about 90 mV with 45 rom
Platter rotates at abnormal-
ly high speed.
¥ YES
Does voltage at Q03 collector
fall from about 6 V to0 V
;
Set power switch to OFF and
when tone arm is brought
pNO_
ae
DOS, Q1~3,
short between Q56 base and
a
ss innermost part of
i
platter?
ground.
VYES
Refer to ''Tone arm does not
perform auto-in operation"
under Inspection 2.
i
Rotate platter by hand. AC
Output at pin 2 of 1C51?
Defective IC51, de-
fective motor (detec-
tion pattern discon-
ves
nection)
noe
NO
Is Q54 switching?
Defective Q51—54
Inspection 8
YES
6 (Twas oalebe
NO. psec OH
Refer to ''Tone arm does not
is
perform auto-in operation"
Inspection 6
under Inspection 2.
Inspection 9
No resetting when
power
switch is set to ON.
Refer to ''Tone arm
NO
does not perform
auto-In operation"
under Inspection 2.
"
|e
Are other operations OK?
"y
YES
v
h
NO
Defective repeat
Does auto-in operation
|_ Check repeat switch.
switch
continue when power
es
YES
switch is set to OFF and
Y
then again to ON while
Continues.
ke
YES
NO
c
1
¥ NO
About 0 V at pin® of 1C04
|__|
Defective 1C04
Is CO3 @ side wire dis-
NO
;
WES
eonnected?
Po
-»| Solder it back.
"il
Check DO7
|
y YES
No resetting even with C03
YES ,
;
replacement?
| Resetting
=H
i NO
NO
"Check DO2
____
} "|
Defective D02
¥ YES
About 7 V at pin@ of 1C04,
NO
,
about 0 V at pindd?
|_Defective 1C04
"
a
Jf
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