M-450/455
12
12
Note on Schematic Diagram :
Note :
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50WV or less are not indicated except for electrolytics and
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise specfied.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 3V and fed with regulated dc power supply from
battery terminal.
• Voltage are dc with respect to ground under no-signal conditions.
no mark : PLAY
(
): REC
• Voltages are taken with a VOM ( Input impedance 10M
Ω
).
Voltage variations may be noted due to normal production tole ances.
• Signal path.
E
: PB
a
: REC
FC GND
VCC
VCC
FC
WB
VCC
NC
UOUT
VOUT
WOUT
P-GND
VB
UB
GND
TO
CONTROL
BLOCKS
TO
EACH
BLOCKS
RI
OUT
VSP
IN+
VREF
S/S
COM
OSC
7
5
4
3
1
2
6
8
9
10
11
12
13
14
15
16
18
20
19
STARTING
DETECT
POWER
SUPPLY
BIAS
OSCILLATING
CIRCUIT
SPEED CONTROL
REFERENCE VOLTAGE
REFERENCE
VOLTAGE
CURRENT
DETECT
SPEED
DETECT
WAVEFORM DETECT
COMMUTATION STARTING LOGIC
SOFT SWITCH
PRE DRIVER
+
–
17
IC601 LB1979VS-TLM