Kenwood CT-405-HU Service Manual

STEREO DOUBLE CASSETTE DECK

TAPE

AUTO REVERSE

TAPE

AUTO REVERSE

POWER

PHONES

TIMER PLAY

REC OFF PLAY

MODE

REC LEVEL/BAL /BIAS

- ON – OFF

237

¡1¡8PAUSE ¶

REC/ARM

237

RESET A

MIN/L MAX/R

DOLBY NR REV.MODE NORM.DUBB HIGH DUBB MPX FILTER

CCRS AUTO BIAS RESET B

PLAYBACK

RECORDING PLAYBACK

LINE IN

REC PLAY

LINE OUT

SYSTEM CONTROL

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-)

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 / 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

(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)

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

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

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

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

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

+ 12 hidden pages

Kenwood CT-405-HU Service Manual

CONTENTS / ACCESSORIES

Contents

Accessories

BLOCK DIAGRAM

CIRCUIT DESCRIPTION

1. Pin description of microprocessor

2. Key matrix

3. Description of R/P output for microprocessor.

adjustment