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18
m@ SCHEMATIC DIAGRAM
Di main circuit BoarRD
Q1,2
2SC2603E
P.BIEQ PEAK
17
16
15
14
1C1
M5220L
P.B/EQ AMP
+8
Q3~8
2SC2603E
SWITCHING
Q9, 10
2SD1468E
SWITCHING
Q50
2SD1450R
Q51
2SD1450R
TAPE 1 MOTOR SPEED CONTROL
TAPE 2 MOTOR
SPEED CONTROL
Dolby NR/MPX IN-OUT
+B
13
12
Q21, 22
2SK381D
11
Q25, 26
2SC2603E
SWITCHING
10
IC6
M5218L
Q31, 32
2SA1115EF
Q35, 36
2SC2603E
Q37, 38
2SD1468E
REC AMP
CrO,/ON SWITCHING
Metal/ON SWITCHING
SWITCHING
=
+8
R101
PN
wean
82 1 Yow!
TAPE |
PLAYBACK, HEAD
C37 10P
LCH
R76 560
R60 180
8; 2
Wn
7
R20 8.2
ov
@ C16 0.0068
sy)
C14 001
Ic4
M5218L
MIXING AMP
M5220L
10k
P.BIEQ AMP
1c21'2)
C38 10P
TAPE 2
RECORD/ PLAYBACK.
HEAD
cH +>
>
|
Ls
RCH => {|
oars
B |
2SC2603E
SWITCHING
S1-2
SI=1
R36
47K
R42
4K
2SA1115EF
LINE
IN
LCH
R155 39K
R122 10K
2SK381D
MIX AMP
Dolby NR/MPX IN-OUT
Dolby NR block
C62 50V)
R71
270K
180K
R75 560
R100
L5K
C122
SOV]
aq FL METER CIRCUIT BOARD
Q27~30
Ov
2SC2603E
CrO,/ON SWITCHING
IC 6 (1/2)
-8
Q33, 34
2SC2603E
CrO,/OFF SWITCHING
R133 10K
D27
R115 1.5K
2SD1450R
SWITCHING
R200
R201
10K
100
R180 1.2K
56K
ian TOIVAw)
10\1/2W)
[A] 22 (!/aW)
ERASE. HEAD
oay|
188133
M5218L
IC 71/2)
HEADPHONES AMP
2
ia
Ge)
o
JACK CIRCUIT
BOARD
it
©-©
GEEEEEE
©
| : | _
7
0302
'50V0,22_#
C301
~p50v0.22
3.9K
VR302
D301
pee
=
6
VR301
47K (8)
ES
1C301, 302
BA6146
FL METER
DRIVE
Q301, 302
2SC2603E
PEAK SET/
RESET
© 1SR35200
IMAL
180 (/aW)
* For [DB] mark areas.
Bd Ac POWER SUPPLY
CIRCUIT BOARD
Power suppty
¥222C
a
TAPE |
MOTOR GOVERNOR
as
@
Q57
2SB941Q
FILTER
R181 1.2K
R130 4.7K
W-
i
-@
H
1
1
1
|
|
|
|
(|
Q59
2SC2603E
SWITCHING
+B
PLUNGER
(AY SWITCH CIRCUIT BOARD
€3)
C4)
C3)
€6)
@)
€3)
c
Q58
D35~37
2SD985K
TLR205
SWITCHING
—
7T—
* For [B] mark areas.
* For (NJ[F][D) mark areas.
[|| (jac power suppy |
CIRCUIT BOARD
* For [A] mark areas.
3
2
NOTES:
'ls
16.
sls
18.
19;
20.
2
22.
23.
24.
25.
26.
20
28.
29.
30.
31,
$1-1~S$1-10:
Record/playback switch (shown in playback position).
@ ...Playback, @) ...Record
$2-1,S2-2
: Dolby NR switch (shown in OUT position).
@...Dolby OUT, @...Dolby IN
$3-1~S3-4
: Dubbing/Mixing switch (shown in OUT position).
@ ...Dubbint/Mixing OUT, @) ...Dubbing/Mixing IN
$4-1,S4-2
: Dubbing speed switch (shown in normal position).
@ ...Normal, @)...High
S6
: Tape [2] playback switch (shown in stop position).
$7
: Tape
FF/REW
switch (shown in stop position).
S8
: Tape
playback switch (shown in stop position).
s9
: Tape [1] FF/REW switch (shown in stop position).
$10
: Tape [1] playback E.Q. switch (shown in 70us position).
$12
: Auto tape selector (for Metal mode).
. $13
: Auto tape selector (for CrO, mode).
$14
: Tape [1] motor switch (shown in OFF position).
. $15
: Tape [2] motor switch (shown in OFF position).
S16
: Power ON/OFF switch (shown in OFF position).
. S17
: AC power voltage selector.
[For United Kingdom.]
VR1,2
: Tape [1] playback gain adjustment VR.
VR3, 4
: Tape [2] playback gain adjustment VR.
VRS5,6
: Tape [2] input level control.
VR7,8
: Tape [2] overall gain adjustment VR.
VRQ, 10
: Tape [2] bias current adjustment VR.
VR301, 302 : FL meter adjustment VR (for 0dB).
L1,2
: MPX coil.
L3, 4
: Peaking coil.
ES;'6:
: Trap coil.
L7
: Bias oscillation coil.
Resistance are in ohms (8), 1/4 watt unless specified otherwise.
1K = 1,000(82),
1M = 1,000 K(22).
Capacity are in micro-farads (uF) unless specified otherwise.
All voltage values shown in circuitry are under no signal condition and
playback mode with volume control at minimum
position otherwise
specified.
(
Riecac Voltage value at record mode.
For measurement
use VTVM.
(==Pe=) indicates the flow of the playback signal.
(=s— =) indicates the flow of the recording signal.
(_+B8_)
indicates B+ (bias).
(_=B_)
indicates B-
(bias).
Important safety notice.
Components identified by A\ mark have special characteristics important for
safety.
When replacing any of these components, use only manufacturer's specified
parts.
The part No. of transistors, |C and diodes mentioned in the schematic
diagram stand for production part No. Recording the part No. with
the production part No. are different from the replacement part No.
mark,
Therefore, when placing an order for replacement part, please use the part
No. in the replacement part list.
¢ This schematic diagram may be modified at any time with the development of
new technology.
@ EQUIVALENT CIRCUIT
1C301, 302: BA6146
|) feerece For all European areas
except United Kingdom.
Lanes For United Kingdom.
IN| eee: For Asia, Latin America,
Middle East and Africa areas.
[A] hee For Australia.
For Asian PX.
For European PX.
eeverencce
jebbbbbbe
ae
(D—9—-1)
* Input level control...MAX
Playback S/N ratio
* Test tape...QZZCFM
Greater than 45dB
Overall distortion
* Test tape
...QZZCRA for Normal
...QZZCRX for CrO,
...QZZCRZ for Metal
Less than 4%
Overall S/N ratio
*Test tape...QZZCRA
Greater than 45dB
(without NAB filter)
—s-—
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