Trouble Shooting - Technics SL-1200MK2 Service Manual

(B)
I
It doesn't rotate
Runaway operation
Turntable rotates
abnormally
Speed changeover is
defective
TROUBLE SHOOTING
Power switch doesn't
operate
Start/Stop switch
"push"
(F) Strobe not
illuminating
Power circuity check
" TP5 - 20V
Reference voltage circuity check
" TP5-20V
YES
Control circuity check
" Check voltage and wave
form at IC201
Drive circuity check
" Check voltage and wave
form at IC101
YES
heck voltage on Q201
NO
" Base voltage - 10V
Reference voltage circuity check
" TP5- 20V
YES
Control circuity check
" Check voltage and wave
form at IC201
Drive circuity check
" Check voltage and wave
form at IC101
YES
FG circuity check
" Check voltage on Q203
Control circuity check
" Check voltage and wave
form at I C201
Pitch control circuity check
Check voltage and wave
form at IC301, IC302
Speed select circuity check
" TP13 -3 .4V
" TP14-0V
Check voltage at TP28 and TP29
" TP28 - 18AV
" TP29 - 9.6V
NO
NO
NO
IC201
X201
NO
NO
NO
NO
NO
NO
IC301
IC302
NO
NO
F1, S601, T1
D1, 61.1 -Q3
Q201
Q1 -Q3
D2
IC201
Q203,
FG coil
X201
I C201
IC201
S 201, S 202
13201, 13202
Q202
13203-. .13206