TC-KE240, TC-RE340 - Sony Audio Service Manual (repair manual). Page 13

13

Procedure:
Mode: playback

1. Set to the test mode (See page 12).
2. Press the

H

button to playback.

3. Adjust RV301 so that the frequency counter reading becomes

3,000±90 Hz.

4. Frequency difference between the beginning and the end of

the tape should be within 3%.

Adjustment Location: MAIN board (See page 14)

Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)

(WS-48B)

Procedure:
Mode: playback

Adjust RV121 (L-CH) and RV221 (R-CH) so that the reading on
level meter meets the adjustment limits below.

LINE OUT level: –7.7±0.5 dB (0.301 to 0.338 V)
Level difference between channels: within 0.5 dB

Check that the LINE OUT level does not change even if playback
and stop operation is repeated several times.

Adjustment Location: MAIN board (See page 14)

+
–

set

LINE OUT jack (J301)

frequency counter

test tape
WS-48B
(3 kHz, 0 dB)

47 k 

Ω

+
–

set

LINE OUT jack (J301)

47 k 

Ω

test tape
P-4-L300
(315 Hz, 0 dB)

level meter

1. Set RV141 (L-CH) and RV241 (R-CH) to mechanical center

and turn the set recording mode.

2. Connect digital voltmeter as shown by the following table.
3. Press the H button to playback.
4. Adjust the following transformers for the minimum readings

on the digital voltmeter.

Measurement Point

Adjustment Part

Value

L-CH

TP301 pin 2 and 3

T101

minimum

R-CH

TP301 pin 1 and 2

T201

Specified value: Maximum 220 mV

Adjustment Location: MAIN board (See page 14)

[REC LEVEL]

 volume: standard record position (See page 12)

Procedure:
Mode: record and playback

1. Set to the test mode (See page 12).
2. Press the 

[REC    ]

 button then the

H

button to start record-

ing.

3. Press the

x

button to stop recording and press the

H

button

to playback.

4. Adjust TC-KE240: RV142 (L-CH) and RV242 (R-CH), TC-

RE340: RV141 (L-CH) and RV241 (R-CH) so that 10 kHz
playback output is 0±0.3 dB relative to the 315 Hz output.

Adjustment Location: MAIN board (See page 14)

–
+

set

LINE IN jack (J301)
(no signal)

TP301

3

2

1

L-CH

R-CH

47 k

Ω

digital voltmeter

CS-413 blank tape

set

47 k 

Ω

AF OSC

Attenuator

LINE IN jack (J301)
315 Hz
10 kHz

50 mV (–23.8 dB)

600 

Ω

10 k 

Ω

CS-123
blank tape

LINE OUT jack (J301)

level meter

+

–

TC-KE240

TC-RE340

adjustment screw

adjustment screw

z

Adjustment Location: record/playback head