Sony TCKE-240, TCRE-240, TCRE-340 Service manual

TC-KE240/RE340

SERVICE MANUAL

Photo: TC-RE340 (Black type)

Dolby noise reduction and HX Pro headroom ex­tension manufactured under license from Dolby
Laboratories Licensing Corporation.
HX Pro originated by Bang & Olufsen.
“DOLBY”, the double-D symbol ;, and “HX PRO”
are trademarks of Dolby Laboratories Licensing Cor­poration.

SPECIFICATIONS

AEP Model

TC-KE240/RE340

UK Model

E Model

Australian Model

Model Name Using Similar Mechanism NEW

T ape Transport Mechanism Type

KE240 TCM-230ASV1
RE340 TCM-230ASR4N

TC-KE240

TC-RE340

System

Recording system

4-track 2-channel stereo

Fast-winding time (approx.)

100 sec. (with Sony C-60 cassette)

Bias

AC bias

Signal-to-noise ratio (at peak level and weighted with Dolby

NR off)

Type I tape, Sony Type I (NORMAL): 55 dB
Type II tape, Sony Type II (HIGH): 57 dB
Type IV tape, Sony Type IV (METAL): 58 dB

S/N ratio improvement (approximate values)

With Dolby B NR on: 5 dB at 1 kHz, 10 dB at 5 kHz
With Dolby C NR on: 15 dB at 500 Hz, 20 dB at 1 kHz

Harmonic distortion

0.4% (with Type I tape, Sony Type I (NORMAL):
160 nWb/m 315 Hz, 3rd H.D.)

1.8% (with Type IV tape, Sony Type IV (METAL):
250 nWb/m 315 Hz, 3rd H.D.)

Frequency response (Dolby NR off)
Tape type

Type I tape, Sony Type I
(NORMAL)

Type II tape, Sony Type II
(HIGH)

Type IV tape, Sony Type IV
(METAL)

Inputs

Line inputs (phono jacks)

Sensitivity: 0.16 V
Input impedance: 47 kilohms

30 – 15,000 Hz (±3 dB, IEC),
20 – 16,000 Hz (±6 dB)

30 – 16,000 Hz (±3 dB, IEC),
20 – 17,000 Hz (±6 dB)

30 – 18,000 Hz (±3 dB, IEC),
20 – 19,000 Hz (±6 dB),
30 – 13,000 Hz (±3 dB, –4 dB
recording)

– Continued on next page –

STEREO CASSETTE DECK

Outputs

Line outputs (phono jacks)

Rated output level: 0.5 V at a load impedance of
47 kilohms

Load impedance: Over 10 kilohms

Headphones (stereo phone jack)

Output level: 0.25 mW at a load impedance of
32 ohms

General

Power requirements

Europe and certain countries in Asia: 220 – 230 V AC, 50/
60 Hz

Australia: 240 V AC, 50/60 Hz
Other countries: 110 – 120/220 – 240 V AC, 50/60 Hz

Power consumption

TC-RE340: 15 W
TC-KE240: 14 W

Dimensions (approx.) (w/h/d)

430 × 120 × 290 mm

Mass (approx.)

3.3 kg

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

Supplied accessories

Audio connecting cords (2)

Design and specifications are subject to change without notice.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUB­LISHED BY SONY.

2

SECTION 1

SERVICING NOTE

TABLE OF CONTENTS

1. SERVICING NOTE.................................................. 3

2. GENERAL ................................................................... 4

3. DISASSEMBLY ......................................................... 5

4. MECHANICAL ADJUSTMENTS....................... 10

5. SERVICE MODE...................................................... 11

6. ELECTRICAL ADJUSTMENTS......................... 12

7. DIAGRAMS

7-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 15

7-2. Printed Wiring Boards – HEAD RELAY (REC/PB)/

LEAF SW (REC/PB) Boards –....................................... 18

7-3. Printed Wiring Board – MAIN Board – ........................ 19

7-4. Schematic Diagram – MAIN Section (1/2) –................ 20

7-5. Schematic Diagram – MAIN Section (2/2) –................ 21

7-6. Printed Wiring Boards

– TRANS/POWER SW Boards – ................................... 22

7-7. Schematic Diagram

– TRANS/POWER SW Boards – ................................... 23

7-8. Printed Wiring Board – DISPLAY Board – .................. 24

7-9. Schematic Diagram – DISPLAY Board – ..................... 25

7-10. Printed Wiring Boards – KEY/HP Boards – ................. 26

7-11. Schematic Diagram – KEY Board – ............................. 26

7-12. IC Pin Function Description ........................................... 28

MODEL IDENTIFICATION
– BACK PANEL –

Part No.

Model Part No.

TC-KE240

TC-RE340 Australian model 3-042-490-1s

AEP model 3-042-502-0s
UK model 3-042-502-1s
AEP model 3-042-490-0s

Singapore model 3-042-490-2s

8. EXPLODED VIEWS................................................ 30

9. ELECTRICAL PARTS LIST ............................... 33

3

1

234 8065 7 9

• LOCATION OF CONTROLS

– Front Panel –

POWER

DIRECTION MODE

RESET MEMORY

EJECT

qa qd qf qg qk w;qj ql wa wdqh wsqs

SECTION 2

GENERAL

FADER ARL

SYNCHRO

AMS

REC MUTING RECPAUSE

AUTO CAL

DOLBY NR

OFF

B

B

CC

MPX
FILTER

BALANCE

L R

REC LEVEL

AUTO

5

6

4

3

2

1

7

8

9

0

10

PHONES

1 Fluorescent indicator tube
2 Cassette holder
3 m button
4 SYNCHRO button and indicator
5 H button (TC-KE240)

h, H buttons (TC-KE340)

6 FADER button
7 ARL button
8 M button
9 AUTO REC LEVEL indicator
0 RED LEVEL knob
qa POWER button
qs DIRECTION MODE button
qd RESET button
qf MEMORY button
qg EJECT button
qh x button
qj AUTO CAL button (TC-RE340)
qk X button
ql DOLBY NR knob
w; W button
wa BALANCE knob
ws z button
wd PHONES jack

4

)

SECTION 3

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

CASE (410726)

1

two screws
(case 3 TP 2)

3

case (410726)

2

screw (BVTT3 × 6)

1

two screws
(case 3 TP 2)

FRONT PANEL SECTION

1

wire (flat type)
(CN801)

6

claw

7

front panel

section

5

three screws
(BVTP3

2

connector
(CN702)

×

8)

1

wire (flat type)
(CN302)

2

connector
(CN802)

5

screw
(BVTT3

2

two connectors
(CN301, CN803)

×

6)

3

screw

×

(BVTT3

4

harness

6

6

claw

5

MECHANISM DECK

)

(TCM-230ASV1: KE240)
(TCM-230ASR4N: RE340)

1

Push the button (eject).

2

lid (cassette) ass’y

4

mechanism deck
(TCM-230ASV1: KE240)
(TCM-230ASR4N: RE340)

3

four screws
(BVTP2.6

×

8)

MAIN BOARD

3

bracket (TR)

5

main board

1

connector
(CN701)

2

screw (BVTP3 × 8)

4

screw (BVTP3 × 8

6

CASSETTE HOLDER (L) ASS’Y

1

step screw

7

loading spring (L)

3

screw (BVTT2 × 4)

4

fulcrum plate (L)

2

lever (LOCK L)

6

fulcrum plate (R)

q;

damper

9

two screws
(BVTT2

×

5)

8

cassette holder (L) ass’y

CAPSTAN MOTOR ASS’Y, LEAF SW BOARD

4

screw
(PS2.6 × 6)

6

leaf SW board

5

claw

5

screw (BVTT2 × 4)

3

capstan motor ass’y (M1002)

4

screw (PS2.6 × 6)

1

two solders

7

belt (capstan)

2

two screws
(PS2.6 × 6)

5

two claws

7

PINCH LEVER ASS’Y

y

RE340

4

pinch lever
(REV) ass’y

3

claw

2

pinch lever (FWD) ass’

1

claw

FLYWHEEL ASS’Y

RE340

6

flywheel (REV)
ass’y

7

washer

1

belt (FR2)

3

4

washer

2

stopper washer

flywheel (FWD) ass’y

RE340

5

stopper washer

8

MECHANICAL BLOCK ASS’Y (AMS)

g

2

two screws
(BVTT2

×

3.5)

3

mechanical block ass’y
(AMS)

4

reverse
slider

2

two screws
(BVTT2

×

3.5)

1

torsion sprin

RE340

HEAD BASE ASS’Y (KE240), HEAD DECK ASS’Y (RE340),
HEAD RELAY BOARD

2

head relay (REC/PB)
board

3

tension spring (HEAD)

4

head base ass’y (KE240),
head deck ass’y (RE340)

1

screw (BVTT2 × 4)

9

SECTION 4

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:

record/playback/erase head pinch roller
rubber belt capstan
idler

2. Demagnetize the playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the
parts adjusted.

5. The adjustments should be performed with the power supply
voltage unless otherwise noted.

• Tor que Measurement

Mode Torque Meter Meter Reading

Forward CQ-102C (28 – 69 g•cm)

Forward
Back Tension

Reverse CQ-102RC (30 – 69 g•cm)

Reverse
Back Tension

FF, REW CQ-201B (70 – 159 g•cm)

CQ-102C (1.1 – 6.0 g•cm)

CQ-102RC (1.1 – 6.0 g•cm)

2.74 – 6.86 mN•m

(0.42 – 0.90 oz•inch)

0.1 – 0.59 mN•m

(0.01 – 0.06 oz•inch)

2.74 – 6.86 mN•m

(0.42 – 0.90 oz•inch)

0.1 – 0.59 mN•m

(0.01 – 0.06 oz•inch)

6.86 – 15.68 mN•m

(0.83 – 2.78 oz•inch)

10

SECTION 5

dB

–20 –10 –4 0 +2 +4 +6 +8–30

–

∞

L
R

;

figure 1

TAPE TYPE

dB

–20 –10 –4 0 +2 +4 +6 +8–30

–

∞

L
R

PLAY

REC

DOLBY NR

M

AUTO

CAL

I II IV

B C

88 88

;

figure 4

SERVICE MODE

Key Check & Display Check Mode

1. While pressing two buttons of [SYNCHRO] and

[REC MUTING ], press the [POWER] button to turn the

power ON.

2. Enter the test mode and display as figure 1.

3. Each time some button is pressed or switch position is selected,
the fluorescent indicator tube displays as following table.

Button or Switch Display

RESET refer to figure 2
MEMORY refer to figure 3
SYNCHRO all segments (refer to figure 4)
FADER 0 (refer to figure 5)
ARL 1

m 2
h *1 3
H 4
M 5
x 6

PAUSE X 7
REC MUTING W 8
REC z 9
AUTO CAL *1 A

MPX FILTER C DOLBY NR [C]
MPX FILTER B DOLBY NR [B]
OFF no indication
C [C]

Dolby NR

switch

B [B]

*1) TC-RE340 only

W

I

–

–20 –10 –4 0 +2 +4 +6 +8–30

∞

dB

L
R

;

8

figure 2

–

–20 –10 –4 0 +2 +4 +6 +8–30

∞

dB

L
R

;

figure 3

number indication

0

–

–20 –10 –4 0 +2 +4 +6 +8–30

∞

dB

L
R

;

figure 5

11

SECTION 6

e

ELECTRICAL ADJUSTMENTS

Note: The adjustments should be performed in the order given in the ser-

vice manual. As a rule, adjustments about playback should be per­formed before those about recording.
The adjustments should be performed for both L-CH and R-CH.

• Switches and controls should be set as follows unless otherwise
specified.

DOLBY NR, MPX FILTER switch: OFF
DIRECTION MODE switch: g

• Standard Record:
Deliver the standard input signal level to the input jack and set
the [REC LEVEL] volume to obtain the standard output signal
level as follows.

– Record Mode –

J301

AF OSC

attenuator

600

LINE IN

10 k

Ω

jack

Ω

LINE OUT

set

jack

47 k

level meter

Ω

+
–

0 dB=0.775 V

Standard Input Level

input terminal LINE IN

source impedance 10 kΩ

input signal level 0.5 V (–3.8 dB)

Standard Output Level

output terminal LINE OUT
load impedance 47 kΩ

output signal level 0.5 V (–3.8 dB)

Record/Playback Head Azimuth Adjustment

Procedure:

1. Mode: FWD playback

Test tape
P-4-A100
(10 kHz, –10 dB)

47 k

set

level meter

Ω

+
–

LINE OUT jack (J301)

2. Turn the adjustment screw for the maximum output levels. If
these levels do not match, turn the adjustment screw until both
of output levels match together within 1 dB.

output
level

within
1dB

L-CH peak

within
1dB

angl

R-CH peak

L-CH
peak

Screw
position

R-CH
peak

3. Phase Check
Mode: playback

test tape
P-4-A100
(10 kHz, –10 dB)

L-CH

47 k

oscilloscope

Ω

Test T ape

Ty pe Signal Used for

P-4-A100 10 kHz, –10 dB Azimuth Adjustment

P-4-L300 315 Hz, 0 dB Playback Level Adjustment

WS-48B 3 kHz, 0 dB Tape Speed Adjustment

Test Mode

1. While pressing two buttons of [ARL] and [REC MUTING ],

W

press the [POWER] button to turn the power on.

2. All segments of the fluorescent indicator tube are light up for
about one second, and the test mode is set.
The test mode has a special function as bellow.

• Counter RESET & MEMORY Function
(1) Press the [RESET] button to reset the counter.
(2) Press the [REC ] button then the H button to starts

z

recording.
(3) After record, press the x button to stop recording.
(4) Press the m button to rewind the tape.
(5) Rewinding tape is automatically stopped at the point

where recording was started.

3. To release the test mode, press the [POWER] button to turn
the power off.

H

V

set

R-CH

LINE OUT jack (J301)

Screen pattern

in phase 45

°90°

Good Wrong

47 k

Ω

135°180

+

+

–

–

°

4. Change the REV playback mode and repeat the steps 1 to 3.
(TC-RE340 only)

5. After the adjustment, lock the screw with locking compound.

Adjustment Location: record/playback head (See page 13)

12