How it Works
Kenwood
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KXFW-4030-E
Service manual
18 pgs1.1 Mb0
Table of contents
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Kenwood KXFW-4030-E, KXFW-4030-S, CT-405 Service manual

STEREO DOUBLE CASSETTE DECK
TAPE
A
TAPE
B
POWER
PHONES
TIMER PLAY
REC OFF PLAY
MODE
REC LEVEL/BAL /BIAS
- ON – OFF
1
237
¡1¡8PAUSE
REC/ARM
0
237
RESET A
MIN/L MAX/R
DOLBY NR REV.MODE NORM.DUBB HIGH DUBB MPX FILTER
CCRS AUTO BIAS RESET B
0
PLAYBACK
RECORDING PLAYBACK
LINE IN
REC PLAY
LINE OUT
SYSTEM CONTROL
L
R
70%
CT-405 KXF-W4030/W4030-S/W4030E
SERVICE MANUAL
Front panel ass'y * (A60-)
Knob(EJECT) (K27-2431-08)
Cassette door ass'y * (A53-)
Knob(POWER) * (K27-)
Control button * (K27-)
Display window (B03-3870-08)
H/P jack (E11-0925-08)
Knob(TIMER) * (K27-)
Knob(ROTARY)* (K27-)
© 2000-3/B51-5604-00 (K/K) 3037
Knob(EJECT) (K27-2431-08)
Cassette door ass'y * (A53-)
Metallic cabinet * (A01-)
* Refer to parts list on page 18.
RCA jack (E63-1076-08)
Phone jack (E11-0918-08)
AC power cord bushing* (J42-0083-05)
AC power cord * (E30-)
CT-405/KXF-W4030
Audio cord (E30-0505-05)
........................ (2) System control cord
(E30-2816-05)
............(1)

CONTENTS / ACCESSORIES

Contents

CONTENTS / ACCESSORIES .................................. 2
BLOCK DIAGRAM......................................................3
CIRCUIT DESCRIPTION............................................4
ADJUSTMENT............................................................6
PARTS DESCRIPTIONS............................................7
PC BOARD ................................................................ 8
SCHEMATIC DIAGRAM.......................................... 11
EXPLODED VIEW ....................................................17
PARTS LIST..............................................................18
SPECIFICATIONS....................................................21

Accessories

2
(JK01)
PLAY HEAD (CN01)
REC/PLAY HEAD ERASE (CN02)
RELAY (REC/PB)
PRE AMPLIFIER
DECK A/B (IC1 TA7784)
SYSTM CONTROL (JK02)
(Q06)
R/P SW
(Q19,21
SPEED N/H CONTROL
DECK B)
(Q20,22 DECK A)
(Q54,55
(Q56,57
SOL. SW
DECK B)
DECK A)
DECK A
(CN06)(CN07)
DECK B
(Q51,52
(Q50,53
MOTOR VOLTAGE SW
DECK B)
DECK A)
EQ AMPLIFIER (IC20 CXA1598S) (IC16 TC4051BP)
EQ SW
AUTO-BIAS LEVEL SW (Q34-Q36)
(IC14 UPC1297CA)
DOLBY HX-PRO
(Q23,24)
ERASE OSC (105kHz)
(Q27,28)
BIAS ON/OFF SW
(Q25,26)
ERASE ON/OFF SW
CPU (IC11 LC866524A-5P85)
ELEC. VOLUME CONTROL (IC3 TC9413AP)
LINE AMPLIFIER (IC5 NJM4558D)
(IC4 CXA1561S)
DOLBY B/C NR
(Q15,16)
MPX SW DOLBY SW
(Q17,18) (IC18 NJM4558D)
LEVEL METER AMP
RESET (IC19 S806D)
(IC12 S-24C01)
EEPROM
PHOTO DETECTOR (IC6 BA10393)
HEADPHONES JACK (JK300)
CN08
HEADPHONES AMP (IC17 NJM4556AL)
400/12.5K (Q33)
AUTO BIAS F. SELECT
(Q07A,07)
SW
AUTO BIAS IN
REC/PLAY SW
CN09
CN05
ENCODER SW
CN04
KEY CONTROL FLD DISPLAY
POWER TRANS
CN03
(D01 GBL02)
DC RECTFIRE
+12V REGULATOR (IC9 NJM7812FA)
(IC8 NJM7808FA)
+8V REGULATOR
(IC10 NJM78M05)
+5V REGULATOR
(IC7 NJM79M08)
-8V REGULATOR
(Q14)
-20V REGULATOR
LINE IN LINE OUT
PLAY A/B SW
TYPE I/II SW
REC O/P
SENS/PLAY/CrO2/REC(FWD/REV)
REC MUTE
AUTO BIAS F. SELECT
AUTO BIAS IN
400/12.5K F/O
Ef AC(FLD)
LINE O/P
LINE IN MUTE
CK/STB/DATA
LINE O/P MUTE
KXF-W4030/CT-405

BLOCK DIAGRAM

CT-405/KXF-W4030
3
CT-405/KXF-W4030

CIRCUIT DESCRIPTION

1. Pin description of microprocessor

Pin No. HL
1 AUTO BIAS IN O Auto bias control port. A BIAS Other 2 400/12.5K ,F/O O 400Hz/12.5kHz freq. output. 3 R/P HEAD O Control port for recording/playback. Recording Other 4 REC MUTE O Audio muting control on R/P for B deck. Off On 5 LINE/O MUTE O Audio muting control for line out. Off On 6 B MECH VCC O B mecha. solenoid control. Other Stop 7 A MECH VCC O A mecha. solenoid control. Other Stop 8 B SOL O B mecha. solenoid control. On Off
9 A SOL O A mecha. solenoid control. On Off 10 IN/MUTE O Audio muting control for input. Off On 11 AC CHK I Power failure input. AC On AC Off 12 RESET I Reset signal input. 13 NC - Unused. 14 ENCODER IN B I Encoder input B. 15 VSS - Connected to ground.
16,17 CF 6MHz - Main clock(6.0MHz).
18 VDD - Power supply.
19-22 K1-K4 I Key input(k1-k4).
23 TIMER P/R SW I Timer Play/Rec switch input. 24 CCRS LEVEL O CCRS level control port. 25 LEVEL MTR L/IN I Level meter input (Lch). 26 LEVEL MTR R/IN I Level meter input (Rch). 27 NC - Unused. 28 ENCODER IN A I Encoder input A. 29 - - Connected to system cont. data.
30-35 FLD 1G-6G O FLD grid control port(1G-6G). 36-45 FLD P1-P10 O FLD segment control port(S1-S10).
46 VDD - Power supply.
47-50 FLD P11-14 O FLD segment control port(S11-S14).
51 -VPP - FLD power supply(-26V).
52-61 FLD P15-24 O FLD segment control port(S15-S24).
62 A CrO2 SW I A CrO2 switch input. Type 2 Type1 63 A PLAY SW I A play switch input. Stop Play 64 A SENS. PULS I A photo sensor input. 65 A PACK SW I A pack switch input. Tape No Tape Yes 66 B CrO2 SW I B CrO2 switch input. Type 2 Type 1 67 B SENS. PULS I B photo sensor input. 68 B PACK SW I B pack switch input. Tape No Tape Yes 69 B PLAY SW I B play switch input. Stop Play 70 REC FWD SW I Forward recording switch input. 71 REC REV SW I Reverse recording switch input. 72 VDD - Power supply. 73 MPX FILTER O MPX filter ON/OFF control. 74 REC FILTER O MPX filter ON/OFF control. 75 REC EQ O Rec EQ.(I/II) Control. I II 76 SPEED N/H O B motor speed (normal/hi) control port. Nor Hi 77 DOLBY NR B/C O Control port for dolby NR(B/C). 78 DOLBY NR ON/OFF O Dolby NR ON/OFF control port. 79 A MOTOR SPEED O A motor speed (normal/hi) control port. Nor Hi 80 P.B EQ O P.B EQ. Control. 81 MTR AMP GAIN A O Gain control of level meter amplifier. 82 MTR AMP GAIN B O Gain control of level meter amplifier.
Pin Name I/O Description
ACTIVE
4
CT-405/KXF-W4030
CIRCUIT DESCRIPTION
Pin No. HL
83 AUTO BIAS F SEL. O Auto bias frequency selection 8LPF). 400Hz 12.5kHz 84 ERASE OSC ON/OFF O Erase OSC(ON/OFF) control. Recording Other 85 BIAS OSC ON/OFF O Bias OSC(ON/OFF) control.
86-88 BIAS L1-L3 O Bias level control output.
89 VSS - Connected to ground. 90 VDD - Power supply. 91 NC - Unused. 92 PLAY A or B O A/B deck control port. A Playback Other 93 NC - Unused. 94 EE PROM SCL O EE PROM SCL. 95 EE PROM SDA O EE PROM SDA.. 96 SYSTEM CONT.BUSY O System control byusy. 97 SYSTEM CONT.DATA O System control data. 98 TC9413AP DATA/O O Data output to E. volume. 99 TC9413AP STB/O O Strobe output to E. volume.
100 TC9413AP SCK/O O Clock output to E. volume.

2. Key matrix

PORT SW1 SW2 SW3 SW4 SW5 SW6
(PIN19) A REV A FWD A A RESET -
K1 PLAY PLAY REW FF A
(PIN20) B REV B FWD B B REC/ MODE
K2 PLAY PLAY REW FF REM
(PIN21) A B PAUSE CCRS AUTO RESET
K3 STOP STOP BIAS B
(PIN22) DOLBY REV NOR HI MPX -
K4 MODE DUBBING DUBBING FILTER
Pin Name I/O Description
( ) Microprocessor port
ACTIVE

3. Description of R/P output for microprocessor.

Pin No. Pin Name Description
3 Rec/P.B B Mecha. Recording Mode : H Other : L 4 Rec Mute B Mecha. Recording /Playback Mode : H Other : L 5 Line Mute A/B Playback or B Recording : H Other : L
80 P.B EQ. 70 Tape Type II : H Other : L
1 Rec Input Select Auto Bias Recording : H Other : L 83 A. Bias F Select Auto Bias 400Hz Recording : H Other : L 85 B OSC On/Off Recording/Playback : H Other : L 81 M. Amp Gain 1 P.B/Recording/Dubb. : H Other : L 82 M. Amp Gain 1 Auto Bias : H Other : L
Pin No. Pin Name Rec.M.Fil On Rec.M.Fil Off Other
73 MPX Filter L H H 74 REC Filter L L H
* Filter off when dubbing mode.
Pin No. Pin Name Type I N.Sp Type I H.Sp Type II N.Sp Type II H.Sp
75 Rec E.Q. I/II H H L L
76 Speed N/H H L H L
Pin No. Pin Name Dolby C Dolby B Off
77 Dolby B/C L H H 78 Dolby On/Off L L H
5
LINE IN
REC PLAY
LINE OUT
SYSTEM CONTROL
No. ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
CASSETTE DECK
SETTINGS
ALIGNMENT
POINT
ALIGN FOR FIG.
CASSETTE DECK SECTION TAPE: NORMAL, DOLBY: OFF, INPUT: LINE IN 0 dBs = 0.775 V I. REC/PLAY HEAD
[ 1 ]
DEMAGNET-
IZATION
––
POWER OFF
Remove the cassette
door.
REC/PLAY
head
Demagnetize the REC/
PLAY head with a head
demagnetizer.
[ 2 ] CLEANING –– PLAY
REC/PLAY
head, erase
head, capstan
pinch roller
Clean the REC/PLAY head,
erase head, capstan and pinch roller using a cotton
swab slightly damped with
alcohol.
[ 3 ] AZIMUTH
(A)
MTT·114, TCC-153
0 kHz, -10 dB
(B) PLAY
Azimuth

adjustment

screw
Maximum output. (a)
II. PC BOARD
[ 1 ]
NOR.
SPEED
A DECK
B DECK
HI.
SPEED
NOR.
SPEED
HI.
SPEED
(A)
MTT-111, TCC-110
3 kHz
(B)
PLAY SFR 06
SFR 08
SFR 05
SFR 07
5.4 kHz
5.4 kHz
PLAY
HI DUBBING
Play first and short
* TP2 to GND.
Adjust the tape speed so
that a 3 kHz signal is
produced at the center of
the tape.
Adjust the tape speed so
that a 3 kHz signal is
produced at the center of
the tape.
III. PC BOARD * TP2 (Q12, BASE)
< 1 >
PLAYBACK
LEVEL
MTT-150
400 Hz (200 nWb)
DOLBY
0 dB LEVEL
(B)
20 dBs
0 dBs
(B)
PLAY
A SFR101 (L) SFR102 (R)
Output level : 0 dBs
< 2 >
BIAS
CURRENT
(A)
400 Hz, -20 dBs
12.5 kHz, -20 dBs
Adjust REC level VR so
that the REC monitor
output becomes -20 dBs at 400 Hz, then record and reproduce signal of 400 Hz
and 12.5 kHz in alternation.
SFR11 (L)
SFR12 (R)
Record 400 Hz and 12.5 kHz
in alternation and adjust the
variable resistors which
control the bias current so
that the same playback
level is obtained.
< 3 >
RECORD
LEVEL
(A)
400 Hz, 123mV
(B)
Record and reproduce a
400 Hz, signal under the
conditions set in < 3 >.
SFR09 (L)
SFR10 (R)
Adjust for 0 dBs at line out.
CT-405/KXF-W4030
ADJUSTMENT
6
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