Hitachi HT-60S Bedienungsanleitung Seite 17

HITACHI HT-60S
TROUBLESHOOTING
Check the following points and inspect the appropriate items.
Inspection 1
When the START/CUT button is depressed, does the platter
rotate and the tone arm perform the auto-in operation?
Platter does not rotate. No tone arm auto in operation.
: No — :
About 7 V at pin 4 of 1C03? Defective 1C03. 0 V at pin ) of ICO3 when power No eee is
switch is set to ON and
Yes START/CUT button is depressed? switch.
No -
Defective D17, 20. Yes
No
Yes Check DC motor belt. Replace belt.
pea Q56 collector and Defective O56. Yes (Now set power switch to ON)
;
About 0 V at cathode of D20 with
No Defective D20 or
Yes (Now rotate platter by hand) tone arm at arm rest position? CdS02.
Ye
Output between O55 collector and Defective O55.
emitter?
Check D17, 20.
S
N
About 7 V at pin(3) of 1CO1? ow! Defective 1COT.
ie)
+ Defective Q54. ies
About 7 V at pin(@) of 1CO3 when
Defective 1C10 or
motor.
No ;
START/CUT button is kept in Defective ICO03.
Defective 058-61
depressed position?
or motor.
N
Output at Q54 emitter?
Yes
Output at pin) or (7) of 1C10?
Yes
Over about 5 V at pin@) of IC03
with tone arm at arm rest position?
No
N
Check DO3. "> Defective DO3.
Yes
Defective Q11 or
D14.
Yes
Output at Q68—61 emitters?
No speed selection. Refer to 'No tone
About 6 V at Q11 base?
arm auto in Yes s
operation" in About 0 V at pin @ of 1C02? 2) Defective ICO2 or
Are all other operations OK?
Inspection 2.
[ About ov ueERS
DO4, C02.
Yes
Yes
7 V at pin 3) of ICO6 when speed
selector knob is changed from
33-1/3 to 45 rpm?
i ) N :
Defective speed pie emt ae IOs: 2 Defective IC03.
selector switch, p - P :
1C06, Q03, D32.
About 7 V at pin (0 of 1C01, 0 V at
pin dy?
Yes
Defective Q04—07 or DC
motor.
Defective |C01.
Inspection 4
No UP/DOWN tone arm
movements.
| Yes
Are all other operations OK?
| Yes
7 Vat pin @ of ICO5 when change
from DOWN to UP?
Refer to 'No tone
arm auto in
operation" in
Inspection 2.
Defective 1C05,
UP/DOWN switch.
Defective IC01
7 Vat pin @of IC01?
a Wy an