Hitachi HT-60S Bedienungsanleitung Seite 18

HITACHI HT-60S
Does platter rotate when tone
arm is brought manually to
inside circumference of platter?
| No
Check the 034 lights.
ye Defective D34
Defective CdS02
Defective D20
{No
More than 4 V at D11 cathode
side?
Check D20.
Yes
Check between Q56 collector and
emitter
Further checks identical to those
under 'Platter does not rotate"' in
inspection 2.
Does platter rotate when tone
arm is brought manually to
inside circumference of platter?
Mount securely
Mount it onto unit
plate properly.
No Is sensor holder mounted properly
on unit plate?
Yes
Proceed with Inspections 2 and 3.
Inspection 7
Platter rotates at abnormally
high speed.
Set power switch to OFF and short
between Q56 base and ground.
Defective IC51,
defective motor
(detection pattern
disconnection).
Rotate platter by hand. AC output
at pin (7) of IC51?
Yes ie
[is Q54 switching?
Beer
Yes
Does voltage at pins'7), (Mot ICO9 No .
ES from 7,7 V to 0 V? Defective 1C09.
Inspection 8
[ No repeat |
Are other operations OK?
Refer to 'Tone
arm does not
perform auto-in
operation'' under
Inspection 2.
No. | Defective 1C05 or
repeat switch.
7 V at pin 43 of ICO5 when repeat
switch set to ON?
Inspection 9
No auto-return
Refer to 'Tone
arm does not
perform auto-in
operation' under
Inspection 2. Are other operations OK?
Yes
Tone arm returns when arm lifter :
button is set to DOWN, and tone No | Adjust return
arm is brought to innermost part of sensitivity.
platter by hand?
=
Adjust return sensitivity.
Las
Check voltage at R47, R48
intersection: No
About 70 mV with 33-1/3 rpm;
about 90 mV with 45 rom
E
Perform
Inspection 1.
Yes
Q11 collector voltage drops from
about 6 V to 0 V when tone arm is
brought again to platter's lead-out
groove?
Defective D14 or
Q08, Q09, C17,
C18.
Yes
Refer to 'Tone arm does not
perform auto-in operation" under
Inspection 2.
Inspection 10
Refer to 'Tone arm does not
perform auto-in operation' under
Inspection 2.
Inspection 11
No resetting when power
switch is set to ON.
ae
Does auto-in operation continue |
when power switch is set to OFF Yes
and then again to ON while tone
arm is performing the auto-in
operation?
a |
No
No
| Check C03.
Replace C03.
Yes
N
Check D02.
~~ Defective DO2.
Yes
About 7 V at pin @) of 1C04, about
|S peteatve 1008]
E V at pingg? Defective 1C04.
_t
About 0 V at pind of 1C02, 7 V at
pind?
Defective C02
Yes
[About 0 V at pin of Io,
NO.
Defective 1coa
Yes
Check DO5.