Schematic Diagram - Main Section (Except Aep, Uk, Chinese Models) (2/3) - Sony HCD-EP505 Service Manual

HCD-EP505
Ver 1.1
6-12. SCHEMATIC DIAGRAM – MAIN Section (Except AEP, UK, CH models) (2/3) – •
MAIN BOARD
(2/3)
HRPE101
RECORD/PLAYBACK/
ERASE
L-CH
CN601
7P
R-CH
ERASE
AC16.4
(REC MODE)
12
MAIN
BOARD
(1/3)
(Page 25)
See page 19 for Waveforms.
REC/PB
<0>
SWITCH
{2.9}
<0> {2.9}
Q603
AMP GAIN SWITCH
1.5N 1U
50V
<0>
<0>
<0> {0.4}
{3.6}
2.2N
4.7N
50V
U601
REC/PB SWITCHING
U602
<0>
SW R2
ALC,
<0.1> <0> <0>
REC/PB AMP
GND
<0>
SW P2
IC B/D
<7.7>
VCC
GND
<0> {8.9}
CONT
<0>
SW P1 <0.1>
<0>
GND
<0>
SW R1
50V
IC B/D
2.2N
Q602
REC/PB
SWITCH <0.7> {0.1} <0>
{0.4}
<0>
{3} <0>
<0>
Q604
1.5N
50V AMP GAIN
{3}
CONTROL
<0>
{3.6}
22
<0>
9.1
{8.9}
<9>
{8.3}
<0.4>
{-0.1}
<0.4> Q616, 617
REC BIAS SWITCH
(0) <9>
{0.5}
<0> {0.7}
<0>
{0.1}
Q615
BIAS OSC
7.9 7.9
4.6 4.6
50V
4.1 4.1
REC AMP
REC AMP
• See page 32 for IC Block Diagrams.
50V
<0> <0>
REC/PB
<0>
SWITCH
50V
<0.7>
50V <0>
{0.1}
Q619
<0>
ALC
CONTROL {0.7}
<0>
MUTING
50V
50V
<0>
50V
{0.7}
MUTING
<0.7>
50V
50V
4.7N
<0>
50V
<0>
<0>
{0.7}
Q606
REC/PB
SWITCH
<8.4> {0.1}
<0> {0.7}
16V
INVERTER
50V 2.4
2.4
50V
1.6 1.6
50V
1
BUFFER BUFFER
1
26 26
2SB926
12 0 (0) <11.6>
U603 11.8 (11.8)
{10.8}
AMS
IC B/D
11.8 (11.8)
<2> <7.7> {6.9} {0.1}
0
(0)
50V
<4.3>
50V
50V
2SD1616
0 (0) <11.5>
0
0
0.6
Q622, 624 0
TRIGGER
PLUNGER DRIVE
<11.5>
0
BUFFER
0.6 4 5
0
4.5
Q609, 610
TAPE TYPE
SELECT SWITCH
133
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : TUNER
(
< > : TAPE PLAY
{
Q620, 621
CAPSTAN/REEL
MOTOR DRIVE
1
TAPE
MECHANISM
BLOCK
SUPPLIED
9
WITH THE
ASSEMBLED
BLOCK
0
(Page
(0) 17
27)
MAIN BOARD
CN307
(3/3)
3P
H
(Page
DISPLAY
29)
BOARD
I
DISPLAY
BOARD
(Page 29)
CN302
7P
100N
(Page 25)
11
MAIN BOARD
(1/3)
14
MAIN BOARD
(1/3)
(Page 25)
) : CD PLAY
} : RECORD