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WM-DDH
WM-DD1
i
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3-2.
SCHEMATIC DIAGRAM
B
H
N te:
All capacitors are in juF unless otherwise noted. pF: ppF
50WV or less are not indicated except for electrolytics
and tantalums.
All resistors are in n and i/«W or less unless otherwise
specified.
nmi mu Mi'infr : L-CH signal path
—: R-CH signal path
11
MNR-160IA
MOTOR
FG COIL
' : B+ bus.
I : adjustment for repair.
Power voltage is 3 V and fed with regulated dc power
supply from
Voltage variations may be noted due to norma! produc¬
tion tolerances.
Waveforms are taken to ground in PLAY mode by using
oscilloscope.
Voltage variations may be noted due to normal produc¬
tion tolerances.
Switches:
Ref. No.
Switch
Positi n
S301
TAPE
NORM
S302
DOLBY NR
OFF
S901
POWER
ON
Touching the pin No. 11 of IC601 with the tester probe
causes an extra vibration inside the 1C, which will be
heard from the phones as a high-pitched sound.
If the pin No. 11 of IC601 is touched with the tester
probe, the voltage there will increase, and after about 1
second it will get higher than 0.8V, so that the motor
M901 will stop.
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