Sony TC-366 - Power Supply Circuit Board

(for p.b. equalizer adjustment)
L101 (for record =
check point for equalizer adjustment); R146
lee
ecard
bias
L102
trap
coil
adjustment
|
R129
R145
(9.5cm/)
R171
(for
p.b.
output
level
adjustment}
adjustment)
ee
ene
or
record,
{19¢em/s)
|.
L203
(for dummy coil
adjustment) ».
rN .
p.b. amp. circuit
bias
osc
circuit
board
board
L-CH
R-CH
C128
(for record bias adjustment)-
L103 7
(for
dummy
coil
R272
adjustment) _ (for level meter calibration}
{ <
= i record amp. \ N
£202 d / j | circuit board > BR
Bek | | pose R245 R246 R271
(for
trap
coil
adjustment)
|
{for
record
level
(19em/s)
(9.5cm/s)
(for
p.b.
output
level
adjustment}
f |
adjustment)
check point for i
trap coil adjustment L201
(for record equalizer adjustment)
(for p.b. equalizer adjustment)
Fig. 12-2. Adjusting parts location (2)
12-1. Power Voltage Adjustment
Connection:
CAUTION
As shown in Fig. 12-3. Be careful not to short-circuit the B* circuit to
Adjusting Parts: ground, or the transistor Q304 will be broken.
R309 100k (B) See Fig. 12-4.
power supply circuit board
Procedures: ;
(1) Be sure that the correct power voltage is supplied.
(2) Place the machine in STOP mode.
(3) Adjust R309 to obtain 25 ~ 26V on the VTVM.
R306 Q303
~«— From Power Source
driver, insulated
out
Fig.
12-4
Power
voltage
adjustment
R309
700K (B)
D301
Fig.
12-3
Power
voltage
adjustment
Ey eee