Technics RS-M228X - Page 19

12 u
CIRCUIT BOARDS
CONNECTOR [B+ 10.57v |
[B+ 683v_] [ B- 6.81V
B- 10.53V
1_| REC SIGNAL OUT (R-CH)
2_| GROUND
3 | PLAY SIGNAL IN (R-CH)
=
Connection Point (a)
Connection Point (a’)
CONNECTOR
1 | SIGNAL IN (R-CH)
GROUND
SIGNAL OUT (R-CH)
B- (bias) -10.64V
SIGNAL OUT (L-CH)
B+ (bias) 10.53V
SIGNAL IN (L-CH)
ENCODE (H)
DECODE (H)
DISC (H)
©] &] NI]! a] Al eo] ro
o
CONNECTOR
1 REC SIGNAL OUT (L-CH)
2 | GROUND
3 | PLAY SIGNAL IN (R-CH)
Hi main circuit Boar
NOTES:
© This circuit shown i on the conductor indicates printed circuit on
the back side of the printed circuit board.
* Values indicated in[____] are under no signal condition.
Unless otherwise specified, voltage measurement conditions are that tape
travel is at STOP, tape mode at METAL, and NR switch at OFF.
DOLBY IN ......... Voltage value at IN (NR select switch) mode.
DISG: ieee ceceases Voltage value at DISC (NR select switch) mode.
FF/REW ............ Voltage value at FF/REW mode.
MUTINGON ...... Voltage value at muting ON mode.
For measurement, use VTVM.
© The supply parts number is described alone in the replacement parts list.
¢ This circuit board diagram may be modified at any time
with the development of new technology.
10
[B+ tos7v] [8-10.53
RS-M228X
B- 10.53V
8
RS-M228X
1
B+ 10.57V
B+ 7.88V
Connection Point (b)
B- 16.83V (-17.80V)
Connection Point (c)
B+ 16.74V (17.71V)
* For Australia, Asia, Latin America,
6
* For United Kingdom and Austsralia.
IN
ee a.
mal
| * For all European areas except United Kingdom,
. Asia, Latin America, Middle East and Africa areas.
Middle East and Africa
act
areas.
« Fora
IC1 I1Cc2 IC3
[M5219L] [NE646N] [NE646N]
7 [-0.02V] 5 | 0.02V 1 ov, 9 ~7.82V 1 ov 9 =7.82V
2 | 0.02v| 6 | 0.02V 2 OV | 10 =0.01V 2 OV | 10 OV
3 | 0.02V] 7 |-0.02V 3 |-001V1 11 0.01V 3 ov 11 0.08V
4 |-6.81V| 8 | 6.83V L 4 ov | 12 OV 4 ov | 12 =0.01V
5 | 0.02V/ 13 = 5 | 0.02v/ 13 =
6 | 0.05V] 14 | poLpy IN 0.05V 6 | 0.038V] 14 | po.py iN 0.01V
3.14V 7 |-0.08V | 15 3.13V
7 | 0.02V | 15 | DoLBY IN 0.05V a] =. (46 7 B8V
=} 46 7.88V
IC6
[AN6256]
1 | 10.57V | 9 0.01V
0.01V
2 | 10.56v | 10 (0)
3 10.56V | 11 | OV
4 OV | 12 | -10.53V
4.61V
| (0.07%) | 19 OV
~10.37V
8 |(-10.39v) | 14 ov
0.01V | 15 OV
8 0.01V | 16 | 0.01V
(N * For Asia, Latin America,
Middle East and Africa areas.
| |
im
li European areas.
POWER SUPPLY CIRCUIT BOARD
IC4
[M5218L]
1 0.01V| 5 0.01V
2 0.01v) 6 | 0.01V
3 0.01V; 7 | 0.01V |
4 |-10.53V| 8 | 10.57V
IC5
[M5218L]
7 OV] 5 | O.01V
2 ov| 6 | 0.01V
3 ov] 7 | 0.01V
4 |-10.53V| 8 | 10.57V
1C7
[M5230L]
OV 5_| 1.80V
2 OV 26 day
3 | -11.18V] > | 16.74V
(-11.17V) (17.71V)
4 1ciFaoy| 8 | ov
* For all European areas
and Australia.
Q1
[2SC945-Q]
B | OV (0.68V) [disc 0V]
C/O0V Vv) [OV]
Ef;ov (ov) [—]
Q2
[2SC945-Q]
B OV (0.68V) [disc OV]
Cfov. Vv) [ov]
E OV Ov) [—]
@
[2Scg
=0.35V (0.04
oV
ov. (0
1
B
Cc
E
Q4
[2SC945-Q]
=0.35V (0.04V) [FF REW 0.68V]
OV (OV) (0V]
m| QO]
OV (OV) [=]
Q5
[2SK104]
Ov
Ov
=10.13V
| D
s
G
m) QO] o
Q6
[2SK104]
Q7
[2SK104]
D OV
Ss OV
G |0.04V
Qs
[2SK104]
m|O|o
Qg
[2SC965Q]
=0.10V (0.68V)
OV (OV)
m|Q |
OV. (OV)
Q10
[2SC965Q] [
—0.10V (0.68V) |
OV (OV)
m|O}o@
my} ©} 0
OV (OV)