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L-1200MK2
. • TROUBLE SHOOTING
lAl
Power switch doesn't
Power circuity check
NO
Fl, S601, Tl
operate
• TP5 - 20V
Dl,Ql-Q3
lBlllt doesn't
ro~at;'
r'-
Reference voltage circuity check
1
-NO- ---
:-f-
Q1~Q3
I
I
.TP5- 20V
1
02
(Start/Stop sWitCh)
"push"
YES
~
Control circuity check
NO
,
1C201
I
• Check voltage and wave
-,
X201
form at IC201
"
YES~
Drive circuity check
NO
I
• Check voltage and wave
IC101
form at IC101
YES~
Check voltage on Q201
NO
r
I
• Base voltage - 10V
Q20l
~Cl
Runaway operation
Reference voltage circuity check
NO
Ql-Q3
.TP5 - 20V
02
YES
Control circuity check
NO
• Check voltage and wave
IC201
form at IC201
YES
Drive circuity check
NO
• Check voltage and wave
IC10l
fonm at IC10l
YES
FG circuity check
NO
Q203,
• Check voltage on Q203
FG coil
lOl
Tu rntable rotates
Control circuity check
NO
X201
abnormally
• Check voltage and wave
IC201
form at IC201
YES
Pitch control circuity check
NO
IC301
• Check VOltage and wave
IC302
form at 1C301, IC302
(El Speed changeover is
Speed select circuity check
NO
1C201
defective
• TP13 - 3.4V
S201, S202
• TP14 - OV
0201,0202
(Fl
Strobe not
Check voltage at TP28 and TP29
NO
Q202
illuminating
• TP28 - 18.4V
0203-0206
• TP29 - 9.6V
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