Technics RSX 502 Service Manual

Page 1

ORDER NO. ADS10304608

Service Manual

Dolby NR-Equipped
Stereo Double Cassette Deck

Dd-

* HX Pro headroom extension originated by Bang
Olufsen and manufactured under license from Dolby
Laboratories Licensing Corporation.

"DOLBY", the double-D symbol, and HX PRO" are
trademarks of Dolby Laboratories Licensing
Corporation.

MECHANISM SERIES (AR300)

SP ECI FICATIONS
I CASSETTE DECK SECTION
Deck system Stereo cassette deck
Track system 4-track. 2~channel
Heads
(tape deck 1) Play Permalioy head
(tape deck 2) Rec/play Permalioy head
Erasing Double-gap ferrite head
Motors
(tape deck 1) Capstan DC servo motor
(tape deck 2) Capstan DC servo motor

Recording system
Bias frequency
Erasing system
Tape speeds
Frequency response
NORMAL

C r02

METAL

AC bias

80 kHz

AC erase

4.8 cm/sec, (17/3 ips)

30 Hz~16kHZ
4o Hz~15 kHz (DlN)
30 Hz~17 kHz
40 Hz~16 kHz (DIN)
30 HZ~18 kHz
40 Hz~i7 kHz (DIN)

SIN (Signal leve|:max recording level, CrOz type tape)

Dolby C NR on
Dolby B NF) on
Dolby NR off

74 dB(CClR)
66 dB (CClFi)
56 dB (A weighted)

Technics

Cassette Deck

RS-X502

Color
(K)... Black Type
Area
Country
Code Area Color
(E) Continental Europe.

(EB) Great Britain.

(EG) F.Fi. Germany and Italy.

K
Asia, Latin America, I I
(GC) Middle Near East and
Africa.
(GN) Oceania.
Wow and flutter 0.07% (WRMS)
:o.2% (DIN)

Fast lorward and rewind times
Approx 110 seconds with 0-60 cassette tape
Input sensitivity and Impedance

LINE IN 60 mV/47 kQ
Output voltage and impedance

LINE OUT 400 mV/BOOQ
I GENERAL
Power consumption 20 W

Power supply
For Great Britain and Oceania AC 50/60 Hz. 230-240 V
For Continental Europe. F.R. Germany and Italy
AC 50/60 Hz, 230-240 V

For others AC 50/60 Hz, 110 V/127 Vl220 V/240 V

Dimensions (w x H x D) 360 x 129 x 297 mm

(Ma/5 X 53/32" X11/(s")

Weight 46 kg (10.1 lb.)
Note:

Specifications are subject to change without notice.
Weight and dimensions are approximate

Page 2

RS-X502

ICONTENTS

ACCESSORIES
CONNECTIONS
LOCATION OF CONTROLS
DISASSEMBLY INSTRUCTIONS"
MEASUREMENTS AND ADJUSTMENT
INTERNAL CONNECTION OF FL ..... 12
PRINTED CIRCUIT BOARDS.
SCHEMATIC DIAGRAM
BLOCK DIAGRAM .....
WIRING CONNECTION DIAGRAM .

IACCESSORIES

TERMINAL FUNCTION OF ICS..
TERMINAL GUIDE OF IC
PACKING .......................
REPLACEMENT PARTS LIST
HESISTORS & CAPACITORS...
EXPLODED VIEWS (Cabinet parts)
REPLACEMENT PARTS LIST
EXPLODED VIEWS (Mechanical pans)
REPLACEMENT PARTS LIST ............

(RJA0004) ..... (GC)

AC power supply cord L-type cable
(SJAi 73) ....... (GN) (SJP2257T) ............. 1pc.
(SJA187).. .(E, EG) .,,.1 pc.
(swag) IIIIIII (EB)

AC plug adaptor
(SJP9215) ......... 1 pc.
(For Go area only)

Stereo connection cables
(SJP2249-3) .......... 2pcs.

ICONNECTIONS

Make connections in the numbered sequence by using the
Included cables.

[I] Connect the stereo connection cables.
IZI Connect the L-type cable.

IE Connect the AC power supply cord to the AC
OUTLET of the amplifier or the household
AC outlet.

Amplifier (not included)

E o©
REG 0 © °©
TAPE Fear :3 Ac om AC m~
BACK SYSTEM
0 © O© CDNTROL E]
W ur
I 0 © 0 © 9 0T
t_.__.._l gr

I I I
fFlllLllFlllL) - '
If

r
LINE N e o

u»: It. NOUT 0 @ El
SYSTEM

film CONTROL ONTROL AC OUTLET AC w~

]:_l l-I
This unit

IRIILNRNLI

The illustration at the left shows an example of connections made
when this unit is combined with a Technics hi-fi component system,
and shows only the connections to be made to and from this unit in
that combination.
Refer to the illustration together with the instructions provided
below.
SYSTEM CONTROL IN terminal
Make a connection trom this terminal to the SYSTEM CONTROL
OUT terminal for a cassette deck on a Technics amplifier.
(For detailed information, refer to the operating instructions of the
Technics amplifier.)
SYSTEM CONTROL OUT" terminal
Make a connection from this terminal to the SYSTEM CONTROL
IN terminal of a Technics stereo sound processor or to the
SVSTEM CONTROL IN" terminal of a Technics compact disc
player.
(For detailed intormation. refer to the operating instructions of the
Technics stereo sound processor or the Technlcs compact disc
player.)
CONTROL" terminal
Make a connection from this terminal to the "CONTROL" terminal
for a cassette deck on a Technics multi compact disc player.
(For detailed information, refer to the operating instructions of the
Technics multi compact disc player.)
AC power supply cord (El)
Notes:
OThe configuration of the AC outlet and AC power supply cord
clitters according to area,
IIt this unit is not to be connected with the amplifier, the cord is to
be connected to the household AC outlet.
For United Kingdom

Cut off and dispose of the plug and replace with a suitable
plug. (Refer to For United Kingdom" above.)
Household AC outlet

r\

-
/\>/F~_

Fit a~ suitable pIUg to the AC power supply cord.

"AC OUTLET"

UNSWITCHED outlet

Power is always available, regardless of power switch.
Audio equipment rated up to 100 W can be connected.

72..

, TRANSISTORS AND DIODES. 31

Page 23

ITERMINAL FUNCTION OF ICS

- IC901 (M50963-2485P): MICROCOMPUTER (This microcomputer ls used ior mechanical operation.)

PIS-x502

Pin IIO Pin IIO
No. Mark Division Function No. Mark Division Function
1 Vcc I Power supply terminal Playback equalizer select
23 P3 (2) 0 signal with tape edit of deck 1
2 AVss (GND) - GND terminal (Normal: H', X2 edit: ML)
3 V; I Reference voltage terminal 24 P3 (1) l CD Synchm rec. signal
4 DA Not used open (co STOP: "H, on PLAY: 1")
5 PWM 0 Pulse width modulated signal CD Synchro rec.. .
25 P3 (0) O p055lt>lellniposslble Signal
6 P6 (3) 0 Serial signal lor FL display limSIble: L ,lmposslblel
7 P6 (2) - Not used, open H
26 INTI l AC POWER OFF det.
a P6 (1) 0 Counter reset signal of deck 2 terminal
(RESET": L, others: H")
27 CNVSS - GND terminal
Counter reset signal of deck 1
9 P6 (0) O ,. . n R ' l L=RESET
(RESET :'L" others: H ) esetSlgna ( ,
i 28 RESET | Normal: H)
Variable voltage level signal of
10 AN (7) I rec. level volume 29 Xm l
Clock OSC terminal
11 AN (6) l Peak voltage terminal of rec. 30 XOUT 0
signal
31 as - Not used, open
Operation key switches
12 AN (5) . Deck 2: STOP, F.FthEW, 32 V55 __ GND terminal
PLAY, REC, PAUSE, SYNCHRO
START, X1/X2, counter reset 33 P5 (7) l Test terminal (Normal=H)
Operation key switches 34 P5 (6) | Model Select (Normal: H)
Deck 1: STOP, F.FiIFiEW, F.
13 AN (4) I PLAY, R. PLAY, 35 P5 (5) I Model select (Normal: H)
Reverse-mode Dolby BIC
Mechanism mode switch
Meter-range, counter reset 86 P5 (4) I (now: Ln, OFF": NH")
14 AN (3) | 'Z'eade "9 d9" 5'9" °f deck 37 D5 (3) I Cassette half det. switch
, (ON": L", OFF": NH)
15 AN (2) | '1'931 tape det' S'Qna' °f deck 33 P5 (2) 1 Reverse rec. lnh. switch of deck
2 (0an Ln, OFF": H")
AUTO REC MUTE" key switch .
l. w. l. n Forward rec. Inn swnch of
16 PM) ' Eggglfffiffk 0N- L, 39 w ,0)
40 P5 (0) 1 Reel rotation pulse signal of
17 P4 (0) I Not used, open deck 2
Dolby C ON/OFF" select
41 P1 7 - .l n .l u u n. n ,,
18 P30) _ Notused H O SignaHON : L, OFF 1 H)
__ Dolby B ON/OFF" select
19 P3 (6) Not used 42 P1 (6) 0 signal (flow: ."L OFF": UH)
Mute signal of line out
20 P3 (5) O (Mute 0N": H, Mute OFF": 43 P1 (5) - Not used, open
nu.)
. Playback amp. select slgnei
Mute signal with Cue/FleVIew 44 P1 (4) O . ,, ,. _ i. .,
21 Pa (4) 0 action (Mule ON": ",H Mute we Z'P'B' L , hes' H )
"OFF": 1") 45 P1 (3) O Bias osc ON/OFF" select
Rec. mute signal of deck 2 5'9 ON : L OFF 2 H )
22 Pa (3) o 9'13 "0N": ",H Mute OFF": 46 P1 (2) I Mayback slgnal det output
L ) signa (new: ML OFF": NH)

29 *7