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E Model

Model Name Using Similar Mechanism

XR-CA420

Tape Transport Mechanism Type

MG-25F-136

Tape track

4-track 2-channel stereo

Wow and flutter

0.08 % (WRMS)

Frequency response

30 – 18,000 Hz

Signal-to-noise ratio

TYPE II, IV

61 dB

TYPE I

58 dB

Tuning range

FM tuning interval:
50 kHz/200 kHz
switchable
87.5 – 108.0 MHz
(at 50 kHz step)
87.5 – 107.9 MHz
(at 200 kHz step)

Aerial terminal

External aerial connector

Intermediate frequency

10.7 MHz

Usable sensitivity

11 dBf

Selectivity

75 dB at 400 kHz

Signal-to-noise ratio

63 dB (stereo),
68 dB (mono)

Harmonic distortion at 1 kHz

0.7 % (stereo),
0.5 % (mono)

Separation

33 dB at 1 kHz

Frequency response

30 – 15,000 Hz

Tuning range

MW tuning interval:
9 kHz/10 kHz switchable
531 – 1,602 kHz
(at 9 kHz step)
530 – 1,710 kHz
(at 10 kHz step)

Sensitivity

30 

µV

Tuning range

SW tuning interval:
SW1: 2,940 – 7,735 kHz
SW2: 9,500 – 18,135 kHz
(except for 10,140 – 11,575
kHz)

Sensitivity

40 

µV

Aerial terminal

External aerial connector

Intermediate frequency

10.7 MHz/450 kHz

Outputs

Speaker outputs
(sure seal connectors)

Speaker impedance

4 – 8 ohms

Maximum power output 50 W 

× 4 (at 4 ohms)

Outputs

Audio output
Power aerial relay control
lead
Power amplifier control
lead

Tone controls

Bass 

±9 dB at 100 Hz

Treble 

±9 dB at 10 kHz

Power requirements

12 V DC car battery
(negative earth)

Dimensions

Approx. 178 

× 50 × 178 mm

(w/h/d)

Mounting dimensions

Approx. 182 

× 53 × 161 mm

(w/h/d)

Mass

Approx. 1.2 kg

Supplied accessories

Parts for installation and
connections (1 set)
Front panel case (1)

2006C05-1

© 2006.03

2

Location of Controls .......................................................

3

2-1. Disassembly Flow ...........................................................

4

2-2. Cover ...............................................................................

4

2-3. Mechanism Deck (MG-25F-136) ...................................

5

2-4. MAIN Board ...................................................................

5

2-5. Heat Sink .........................................................................

6

3-1. Assembly Flow ................................................................

7

3-2. Housing ...........................................................................

8

3-3. Arm (Suction) .................................................................

8

3-4. Lever (LDG-A)/(LDG-B) ...............................................

9

3-5. Gear (LDG-FT) ...............................................................

9

3-6. Guide (C) ......................................................................... 10
3-7. Mounting Position of Capstan/Reel Motor (M901) ....... 10

....................... 11

Tape Deck Section .......................................................... 11
Tuner Section .................................................................. 11

6-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 12

6-2. Printed Wiring Board – MAIN Board – ......................... 14
6-3. Schematic Diagram – MAIN Board (1/3) – ................... 15
6-4. Schematic Diagram – MAIN Board (2/3) – ................... 16
6-5. Schematic Diagram – MAIN Board (3/3) – ................... 17
6-6. Printed Wiring Board – KEY Board – ............................ 18
6-7. Schematic Diagram – KEY Board – .............................. 19
6-8. IC Pin Function Description ........................................... 20

7-1. Chassis Section ............................................................... 22
7-2. Front Panel Section ......................................................... 23
7-3. Mechanism Deck Section (MG-25F-136) ...................... 24

............................... 25

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

3

This section is extracted from in-
struction manual for XR-CA420.

Location of controls

RELEASE

SEL

MODE

SRC

OFF

D

D-BASS

MBP

6

5

4

3

2

1

BTM

DSPL

DISC

REP

SHUF

BL SKIP

ATA

MTL

ATT

SEEK

AMS

SENS

SOURCE

Refer to the pages listed for details.

1 Volume +/– button  7, 10

2 MODE (o) button

3 SRC (SOURCE) (TUNER/TAPE/CD/MD)

4 SEL (select) button  7, 10, 11, 12, 13

5 Display window

6 MBP (My Best sound Position) button

7 D (D-BASS) button  11

8 Z (eject) button  7

9 RELEASE (front panel release) button

q; ATT (attenuate) button  10

qa SENS button  10

qs RESET button (located on the front side

qd Frequency select switch

(located on the bottom of the unit)
See “Frequency select switch” in the
Installation/Connections manual.

qf Number buttons  8, 9, 11, 13, 14

During tape playback:

(3)

(5)

(6)

During CD/MD playback:

(1)

(2)

(3)

(4)

qg BTM/MTL (

qh DSPL (display mode change) button

qj OFF button*  6, 7

qk SEEK/AMS +/– button  8, 9, 10, 13

* Warning when installing in a car

without ACC (accessory) position on
the ignition key switch
Be sure to press (OFF) on the unit for two
seconds to turn off the clock display after
turning off the engine.
When you press (OFF) momentarily, the
clock display does not turn off and this
causes battery wear.

4

SET

2-3. MECHANISM DECK (MG-25F-136)

(Page 5)

2-2. COVER

(Page 4)

FRONT PANEL SECTION

(Note 3)

The process described in      can be performed in any order.

Without completing the process described in      , the next process can not be performed.

Illustration of disassembly is omitted.

2-4. MAIN BOARD

(Page 5)

2-5. HEAT SINK

(Page 6)

• This set can be disassembled in the order shown below.

 Follow the disassembly procedure in the numerical order given.

1

screw 
(PTT2.6 

×

 5)

2

cover