Technics SL-1200MK7PP Service Manual page 10

No power
(from the previous section)
Is the correct
voltage presented
between CK2111 (+24V) and
CK2113 (GND) on MAIN PCB to confirm
Power knob operation?
YES
Pin 3 of IC2105
(+4.6 to +5.0 V)
Is the correct voltage
presented between
Pin 3 of IC2105 and CK2113 (GND),
Pin 3 of IC2102 and CK2113 (GND)
on MAIN PCB?
YES
Abnormality in microcomputer related circuits.
Replace MAIN PCB.
NO
Replace MAIN PCB.
CK2111
(+22.8 to +25.2 V)
Pin 3 of IC2102
(+11.5 to +12.5 V)
NO
Abnormality in DC_POWER circuit.
Replace MAIN PCB.
10
CK2113
(GND)
MAIN PCB
CK2113
(GND)