DOWNLOAD Sony TC-KE240 / TC-RE340 Service Manual ↓ Size: 2.9 MB | Pages: 39 in PDF or view online for FREE

9

2

two screws
(BVTT2 

×

 3.5)

2

two screws
(BVTT2 

×

 3.5)

3

mechanical block ass’y
(AMS)

4

reverse
slider

1

torsion spring

1

screw (BVTT2 

×

 4)

2

head relay (REC/PB)
board

4

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

3

tension spring (HEAD)

10

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.

Mode

Torque Meter

Meter Reading

 2.74 – 6.86 mN•m

Forward

CQ-102C

(28 – 69 g•cm)

(0.42 – 0.90 oz•inch)

Forward

0.1 – 0.59 mN•m

CQ-102C

(1.1 – 6.0 g•cm)

Back Tension

(0.01 – 0.06 oz•inch)

2.74 – 6.86 mN•m

Reverse

CQ-102RC

(30 – 69 g•cm)

(0.42 – 0.90 oz•inch)

Reverse

0.1 – 0.59 mN•m

CQ-102RC

(1.1 – 6.0 g•cm)

Back Tension

(0.01 – 0.06 oz•inch)

6.86 – 15.68 mN•m

FF, REW

CQ-201B

(70 – 159 g•cm)

(0.83 – 2.78 oz•inch)

11

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]

B

[B]

*1) TC-RE340 only

W

Dolby NR

switch

dB

–20

–10

–4

0

+2

+4

+6

+8

–30

– 

∞

L

R

;

dB

–20

–10

–4

0

+2

+4

+6

+8

–30

– 

∞

L

R

I

;

8

dB

–20

–10

–4

0

+2

+4

+6

+8

–30

– 

∞

L

R

;

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

;

dB

–20

–10

–4

0

+2

+4

+6

+8

–30

– 

∞

L

R

0

;

number indication

12

The adjustments should be performed in the order given in the ser-
vice manual. As a rule, adjustments about playback should be per-
formed 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 –

input terminal

LINE IN

source impedance

10 k

Ω

input signal level

0.5 V (–3.8 dB)

output terminal

LINE OUT

load impedance

47 k

Ω

output signal level

0.5 V (–3.8 dB)

Type

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

1. While pressing two buttons of 

[ARL]

 and 

[REC MUTING    ]

,

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

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.

Procedure:
1. Mode: FWD playback

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.

3. Phase Check

Mode: playback

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)

Screw
position

L-CH
peak

within
1dB

output
level

L-CH peak

R-CH peak

within
1dB

angle

R-CH
peak

+
–

V

H

+

–

Screen pattern

Good

Wrong

in phase 45

°

90

°

135

°

180

°

LINE OUT jack (J301)

set

R-CH

L-CH

47 k 

Ω

47 k 

Ω

oscilloscope

test tape
P-4-A100
(10 kHz, –10 dB)

0 dB=0.775 V

+
–

set

47 k 

Ω

LINE OUT

jack

LINE IN

jack

600 

Ω

10 k 

Ω

attenuator

AF OSC

level meter

J301

W

z

+
–

set

47 k 

Ω

LINE OUT jack (J301)

level meter

Test tape
P-4-A100
(10 kHz, –10 dB)