Kenwood KX-58W User manual

| STEREO CASSETTE TAPE DECK v D
e | KŁ58W/s8GWw |NENWOO
w SERVICE MANUAL
©1989-4 PRINTED IN JAPAN
B51-3792-00(T)2722
Knob (POWER) Cassette lid* Dressing plate * Tape counter Cassette lid* Metallic cabinet*
(K27-1965-04) (A53-1098-03) (B03-2571-04) (B35-0036-05) (A53-1099-03) (A01-1739-01)
ENWOOD sten oouets cas perre cece kx-aaćw
»——
=>
Phone jack (3P) Knob (OPERATION)* Slide switch Knob (OPERATION) * Panel*
(E11-0162-05) (K29-3582-03) x 4 (S31-1017-05) (K29-3582-03) x 6 (A20-5752-02)
: Knob
(REC BALANCE, REC LEVEL)
(K29-3591-04)
<=
1 > ui À
= ed
L N
GOD o
Phono jack (4P) AC inlet*
(E13-0446-05) (EO3-)
Foot
(J02-0161-04:Front) x 2
(J02-0366-15:Rear) x 2
<=
*Refer to Parts List on page 35.
Photo is KX-58CW.

= KX-58W/58CW
CONTENTS D
AGCESSRIES M 2
CONTROLS: & INDICATORS nennen sn 3
DISASSEMBLY FOR REPAAIR 2 4
BLOCK & LEVEL DIAGRAM nes nei 5
CIRCUT DESCRIPTION unse aa) 6
MECHANISM DESCRIPTION 2. 12
ADJUSTMENT. „use 19
REGLAGES us een ea Ri ea 20
ABGEEJCH aa ies et ie 21
Accessories
Audio cord
N
ADJUSTMENT/REGLAGES/ABGLEICH......................... 22
VOLTAGE TABLES: Zus. 22
P:C BOARD «rush ten OWA lee Ni doco 23
SCHEMATIC DIAGRAM........ eerie A 29
EXPLODED VIEW (MECHANISM)... 33
EXPLODED: VIEW (UNIT) iic Rb ets 34
PARTS: LIST MM M 35
SPECIFICATIONS. sde ett eren Back cover

KX-58W/58CW
CONTROLS & INDICATORS
PEAK LEVEL METER
| DUBBING keys (> NORMAL,
>> HIGH)
These keys are used when performing :
tape-to-tape dubbing.
r CH
| à |
| OFF |
CS |
| OC [oes system]
EL cl
KX-58W
DOLBY NR switch
COUNTER/RESET key
This key is used to reset the counter to
“000”.
O— DUBBING — o m O ORECB
\ > NORMAL > HIGH RELAY (A » B)
l50(8v NR REC BALANCE REC LEVEL Press this key to perform relay play.
| | CENTER
| BOFFC | AEN
I I
1 DOzoerscna] |
Le e zen sel
KX-58CW
REC LEVEL control knob
This knob is used to adjust the record.
ing level. ‘
This switch is used to select the Dolby
noise reduction among ‘’B’’, ''C'' and
“OFF” positions. (KX-58CW)
This switch is used to turn the Dolby
noise reduction ON and OFF. (KX-58W)
REC BALANCE control knob
This knob is used to adjust the balance
of the recording level between L-
channel and R-channel.
POWER switch
KENWOOD STEREO DOUBLE CASSETTE DECK KX-5BCW
PEAK LEVEL METER
O— DUBBING —Q co orce
» NORMAL > HIGH RELAY (A > B)
EEE
CENTER a 5 6
8 or c
nb di ` 7.89
Q DOLBY NR REC BALANCE REC LEVEL
A
PLAY BACK
DEEE)
Eject/Stop (A/M) key
When the deck is operating, pressing
this key stops operation, and pressing
it again opens the cassette holder.
Fast forward (>>) key
PHONES jack
(KX-58CW only)
Rewind (<<) key
Play (>) key
KX-58CW
am II PAUSE
PAUSE (II) key
Eject/Stop
(A/m) key
Fast forward (>>) key
Rewind (<4) key
Play (>) key
REC key

|
KX-58W/58CW
-
DISASSEMBLY
FOR
REPAIR
*Take out the case beforehand.
1.
Remove
the
three
screws
@
and
undo
the
three
catches
©.
then
detach
the
dressing
panel.
2.
Press
the
EJECT
button,
then
detach
the
cassette
lid
©
from
the
cassette
holder.
3.
Detach
the
two
VR
knobs
@.
4.
Remove
the
two
screws
@
and
undo
the
two
catches
O,
then
put
out
the
sub
panel
towards
you.
5.
Disengage
the
tape
counter
belt
O.
6.
In
the
EJECT
mode,
remove
the
eight
screws
Q
installing
the
mechanism,
then
take
out
the
mechanism
in
the
direc-
tion
of
arrow
©.
7.
Undo
the
five
catches,
then
detach
the
switch
board
QD.

KX-58W/58CW
BLOCK & LEVEL DIAGRAM
— 5.5dBs — 9dBs
411mV 275mV
N WO2-0693 nl
CUT
ooer
E
©)
LINE
out
LINE (X)
MUTE Po 10
IC 2 py
(KX-58W)
P.B EQ.SW
LINE
NEA
DEMONE
O
-
72dBs
FILTER
HEAD
011,12
0.19mV
PHONE
DECK B
EM
REC/P.B #+>H
HEAD = REC LEVEL
CONTROL
H
BUFFER CIE
AMP
BALANCE
7 VR
IC 2
R/P
CONTROL
VR6,7
BIAS
REC
EQ.
Be
LEVEL
inr
AMP
`
VR9,IO
024
DECK
A
L3,4
07,8
(X) : SPEED MECHANISM
VRS,6 MUTE ADJ. MOTOR
019
DECKB
BIAS
ERASE
ae
d
IC
3
A.B
MECHA
HEAD IC8,
[—
dl
PLAY
SW
REC
EQ.SEL
y
com
Q20,21
BIAS
X)
BLAS
SW
E
B
MECHA
SELECTOR
022,83
REC.
SW
a SPEED MECHANISM
ADJ MOTOR
Q23
VRIII2

KX-58W/58CW
CIRCUIT DESCRIPTION
FUNCTION OF COMPONENTS
Recording/Playback unit (X28-1980-10-11)
Components
Use/Functions
Operation/Condition/Compatibility
C1 LA3246
Playback EQ IC
C2 uPC1330HA
Head SW IC (Deck B)
Controlled by pin 1 of IC3. Pin 4 becomes 5 V in
recording and O V in playback.
LM6416F-2227
Microprocessor
IC4 HA12136
Dolby B NR IC
KX-58W only.
uPC7818HF
+18 V AVR
C6 M51951ASL Reset IC
CZ M5218P-A REC EQ amplifier NF constant is determined by IC8 and IC9 to ob-
NJM4565D tain the recording equalizer property.
IC8,9 BA6251 EQ selection Pins 1-7 of IC8 (IC9) serve to control the respec-
tive equalizer devices:
IC10 TD62554S REC EO selector Controlled by 029, O16 and Q17 to control IC8
and IC9.
IC11 AN6888 Meter IC 5-point display x2... —10, —6, 0, +3, +6 dB
IC12 M5218P-A MPX buffer
NJM4565D-D
01,2 2SC1740S (Q,R) Playback EQ output SW (Deck B) Controlled by Q15. ON when deck B is played
2SC945(A) (O,P) and OFF when deck A is played.
03,4 2SC1740S (Q,R) Playback EQ output SW (Deck A) Controlled by 015. ON when deck A is played
2SC945(A) (Q,P) and OFF when deck B is played.
05,6 2SC1740S (Q,R) Playback high-frequency compensation SW Controlled by Q16. Normally ON. OFF only in
2SC945(A) (Q,P) (Deck A) high-speed dubbing to decrease playback high-
frequency compensation amount.
Q7,8 28C17408 (O,R) REC muting Controlled by 027. ON in other than recording to
2SC945(A) (Q,P) mute the recording system signal.
09,10 2SC2878(B) Line muting Controlled by 028. ON in other than playback to
mute the line system signal.
011,12 25C1845 (F,E) Headphone amplifier
Q13,14 2SC1740S (Q,R) Playback EQ 120 4/70 u SW Controlled by Q15. Q13 turns ON when deck A is
2SC945(A) (Q,P) played and O14 turns ON when deck B is played.
Q15 28C17408 (Q,R) Playback EQ 120 4/70 y inverter Controlled by pin 9 of IC3. ON when deck A is
2SC945(A) (Q,P) played and OFF when deck B is played.
Q16 2SC1740S (Q,R) Playback EQ inverter ON only in high-speed dubbing. Otherwise OFF
2SC945(A) (Q,P)
|
Q17 2SC1740S (Q,R) EQ speed inverter Controlled by Q16. OFF in normal dubbing and
2SC945(A) (Q,P) ON in high-speed dubbing.
018 2SC2003 (L,K) Dolby IC 14 V AVR control transistor Converts signal system 18 V into Dolby 14 Y
Q19 2SD863 (E,F) Bias OSC Oscillates at 105 kHz.
020 2SC3246 Bias current METAL SW ON in recording on metal tape
021 2SC3246 Bias current CrO? SW ON in recording on CrO2 or metal tape
022 2SC3246 Bias SW ON in recording to turn ON the bias oscillation
023 2SC1740S (Q,R)
2SC945(A) (Q,P)
Bias SW
ON soon at power ON
Q24 2SC733(A) (Q,P)
2SC933SC (Q,R)
A mechanism speed control
ON in high-speed operation
€

KX-58W/58CW
CIRCUIT DESCRIPTION
9 ©
Components
Use/Functions
Operation/Condition/Compatibility
2SA733(A) (Q,P)
2SAY33S(O,R)
REC mut
Controlled by pin 3 of IC3. ON in other than
recording.
2SA733(A) (Q,P)
2SA933S(Q,R)
| Line mute SW
Controlled by pin 4 of IC3. ON in other than
playback.
2SA733(A) (Q,P)
2SA933S(Q,R)
REC mute SW
Controlled by Q25. ON in other than recording.
2SA733(A) (Q,P)
2SA933S(Q,R)
Line mute SW
Controlled by Q26. ON in other than playback.
2SC1740S(Q,R)
2SC945(A) (0,P)
Tape selector SW
ON with metal tape loaded on deck B
2SC3246
| B motor SW
Controlled by pin 27 of IC3. In case of relay play,
OFF until the end of the tape on deck A is
reached, and ON when it is reached.
2SA733(A) (0,P)
2SA933S(Q,R)
B motor control
ON in high-speed operation
2SD863(E,F)
Microprocessor 5 V AVR
Converts 12 V for mechanism to 5 V for
microprocessor.
25D822(0,P,E)
Components
Mechanism 12 V AVR
Electric circuit module (W02-0693-05)
Use/Function
Converts to 12 V for mechanism the DC obtained
by halfwave rectification of AC IN.
Operation/Condition/Compatibility
HA12088ANT
DOLBY B/C noise reduction
KX-58CW only.

KX-58W/58CW
CIRCUIT DESCRIPTION
MICROPROCESSOR
LM6416F-2227
1. Operational specification
The KX-58W/58CW is a mechanism logic double deck using e Relay operation
two mechanisms made by GIKEN. Its circuit control is per- Relay playback (only once) from deck A to B
formed by a microprocessor by use of inputs from mechan- e Timer operation
ism attached switches and tact switches. Timer playback: decks A and B either possible
Timer recording: deck B only
1-1 Functions
(1) Features (2) Microprocessor controlled subjects
e One way X2, double cassette e Selector circuits such as of recording/playback, deck
Deck A: playback only AIB, etc.
Deck B: recording and playback * Dolby IC
e Dubbing * Bias oscillation circuit
Deck A to B: normal speed dubbing e LED indication
Deck A to B: high speed dubbing
BRP PDo PC3
BIAS PD: 2 PC2 BCPM
R.MUTE PD2 3 PCI KSO
L.MUTE PD3 4 PCo KSI
EXtal 5 PA3 KR 3
Xtal 6 Paz KRZ
TEST INT 7 PAI KRI
RESET RES 8 PAo KRO
AHI REo 9 Voo
D ON PE! PGo HISP
CHI PE2 PFs L.DUB
D RP PEs PF2 LHDB
TEST PFi L RLY
Vss PFo LREC
1-2 Pin Functions
Pin name Designation Description
PDo BRP B REC/PLAY selector
PD1 BIAS B BIAS control
PD2 RMUT B REC MUTE control
PD3 LMUT LINE MUTE control
EXtal
Xtal
Oscillator
INT Test mode setting : Normal
RES RESET input : Normal
PEo AIB select A
PE1 Dolby ON/OFF
PE2 Dolby B/C
PE3 Dolby REC/PLAY
TEST Connected to GND (LSI test pin)
Vss Connected to GND

KX-58W/58CW
CIRCUIT DESCRIPTION
Pin name Designation Description
PFo LREC REC LED : ON
PF: LRLY Relay LED l : ON
LHDB high speed dubbing LED : : ON
LDUB Normal speed dubbing LED : : ON
HISP Motor speed, EQ speed select : Normal
Connected to +5 V
Key input H: without input L: with input
Key scan output
B motor ON/OFF
N.C. (OPEN)
1-3 Keys
This unit turns ON/OFF by the mechanism operation because
of using mechanism logics. Its circuit control is performed with
inputs of leaf switches.
Name Operation
PLAY SW (A mechanism) Decks A/B: A selected
ON when head of A mechanism Line mute turns ON and 0.5 sec later, OFF.
ascends. gnored when deck B is in recording except for dubbing.
Decks A/B: B selected
Line mute turns ON and, in case of during play of deck B, OFF 0.5 sec later.
gnored when deck B is in recording except for dubbing.
B main motor ON.
PLAY SW (B mechanism) (1) Normally
ON when head of B mechanism
ascends. Decks A/B: B selected
Line mute turns ON, and 0.5 sec later, OFF.
gnored when deck A is in play.
Decks A/B: A selected
Line mute ON.
Ignored when deck A is in play.
(2) For recording (not dubbing)
Line mute and recording mute turn ON, and O.5 sec later, OFF.
At OFF Line mute and recording muter ON.
Bias OFF.
(3) For dubbing
Line mute and recording mute turn ON and, when deck A is in play, OFF O.5 sec later.
At OFF Recording mute ON.
Line mute ON unless deck A is in play.
Bias OFF.

KX-58W/58CW
CIRCUIT DESCRIPTION
Operation
(1) Normally
At ON REC/PLAY: REC selected, Decks A/B: B selected
Bias ON and REC LED ON.
Ignored when deck A is in play.
REC/PLAY: PLAY selected, Decks A/B: A selected
REC LED OFF.
Ignored unless REC is engaged.
REC SW (B mechanism)
ON when REC key is pressed
(with cassette hub)
(2) For dubbing
At ON REC/PLAY: REC selected, Decks A/B: A selected
Bias ON and REC LED ON
REC/PLAY: PLAY selected.
REC LED OFF.
Effective only when PLAY SW and REC SW are both OFF.
Dubbing LED ON.
High speed dubbing LED and relay LED OFF.
Effective only when PLAY SW and REC SW are both OFF.
High speed dubbing LED ON.
Dubbing LED and relay LED OFF.
Effective only when PLAY SW and REC SW are both OFF.
Relay LED ON and B motor OFF.
High speed dubbing LED and dubbing LED OFF
At OFF
Dubbing key
High speed dubbing key
Relay key
1-4 Operation
Key handling
Operation
Press the dubbing key.
Dubbing LED ON
Let deck A play and set PLAY SW
Dubbing (including | to ON.
Decks A/B: A selected
Line mute OFF 0.5 sec later.
High-speed mode) Press the REC key of deck B, and
set the REC SW and PLAY SW to
ON.
REC/PLAY: REC selected. Dolby OFF. Bias ON.
Speed is high for high-speed mode.
Line mute and recording mute turn ON O.5 sec later.
Dubbing starts.
Press the relay key.
Relay LED ON and B mechanism motor OFF.
Let deck A play and set PLAY SW
to ON.
Decks A/B: A selected.
Line mute OFF 0.5 sec later.
B mechanism motor OFF.
Relay play Press the PLAY key of deck B.
Although the PLAY key of deck B is locked, since the motor is OFF, the
head does not ascend and the PLAY SW of deck B thus remains OFF.
Deck A stops (as tape end is
reached or an operation key is
handled)
B mechanism motor ON and thus ON PLAY SW of deck B.
Decks A/B: B selected.
Line mute OFF 0.5 sec later.