Technics QUARTZ SP-15 - Page 11

m@ TROUBLE SHOOTING
eld BAD
(A) It doesn’t rotate. Check power supply circuit. 31,,F1,
TPO ~ TP10 voltages D1~ 6, 21, 22
Q1,2,21~24
(Refer to schematic diagram.)
BAD 1C101
Q107 ~ 112, 201
~ 203
Check brake release timer.
Q203 voltage (mechanical brake)
D101
Q107 voltage (electronic brake) Solenoid assembly
(Refer to schematic diagram.)
BAD 1C101
Q101 ~ 106
Check drive circuit.
1C101 voltage
(Refer to the reference voltage
for each IC terminal.)
Q101, 103, 105 voltages
(Refer to schematic diagram.)
Check start/stop circuit BAD 1C301 ~ 304
TP31 voltage $301
1C302 voltage
Q301 voltage
(Refer to schematic diagram.)
Q301
Check FG circuit.
1C201 voltage.
(Refer to the reference voltage
for each IC terminal.)
1C201
Stater frame ass’ y
(B) It runs violently.
Check control circuit.
1C202 voltage.
(Refer to the reference voltage
for each IC terminal.)