Sony TC-TX313, Service Manual

Page: 14 / 34

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TAPE IN
315 Hz, 0.49 V (– 4 dB)
TAPE IN
1) 315 Hz
2) 10 kHz
43.6 mV (– 25 dB)
TAPE OUT
Record Bias Adjustment
Setting :
Set to the TEST mode. (See page 4.)
Procedure :
1. Mode: Record
speed checker
or
frequency counter
47 k
Ω
set
test tape
WS-48A
(3 kHz, 0 dB)
Tape Speed Adjustment
Procedure :
1. Mode: FWD playback
Adjustment Limits : normal speed
Speed checker Frequency counter
– 3 to + 3 % 2,910 to 3,090 Hz
Confirm that the deviation between tape top and tape end is within
3%.
Adjustment Location : Capstan motor volume (See page 15.)
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape : WS-48A)
Playback Level Adjustment
Procedure :
1. Mode: FWD playback
2. Adjust SFR03 (L-CH) and SFR04 (R-CH) on MAIN board
so that the reading on level meter meets the adjustment limits
below.
Adjustment Limits :
TAPE OUT level
Level difference
between channels
– 4
±
2 dB (0.39 to 0.62 V) within 2 dB
Check that the TAPE OUT level does not change even if Playback
and Stop operation is repeated several times.
Adjustment Location : MAIN board (See page 15.)
TAPE OUT
level meter
47 k
Ω
set
test tape
P-4-L300
(315 Hz, 0 dB)
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjust SFR01 (L-CH)
and SFR02 (R-CH) on REC board to repeat step 1 and 2.
Adjustment Level : Difference of playback output of 10 kHz to
playback output of 315 Hz : 0
±
0.5 dB
Adjustment Location : REC board (See page 15.)
Record Level Adjustment
Setting :
Set to the TEST mode. (See page 4.)
Procedure :
1. Mode: Record
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become
adjustment level as follows.
4. If these levels do not adjustment level, adjust SFR11 (L-CH)
and SFR12 (R-CH) on REC board to repeat step 1 and 2.
Adjustment Level : Playback output level of 315 Hz :
– 4
±
2 dB (0.39 to 0.62 V)
Adjustment Location : REC board (See page 15.)
TAPE OUT
TAPE OUT
level meter
47 k
Ω
set
recorded portion
AF OSC
attenuator
10 k
Ω
set
600
Ω
blank tape
CS-123
AF OSC
attenuator
10 k
Ω
set
600
Ω
blank tape
CS-123
level meter
47 k
Ω
set
recorded portion