Sony TC-EX66, Service Manual

Page: 12 / 29

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Record Level Adjustment
Setting:
REC LEVEL control: Standard record position (See page 10)
set to the TEST mode (REC MEMRY mode) (See page 10)
Procedure:
1. Mode :Record
+
–
set
LINE OUT
47 k
Ω
test tape
P-4-L300
(315 Hz, 0 dB)
level meter
Adjust RV151 (L-CH) and RV251 (R-CH) so that the reading on
level meter meets the adjustment limits below.
Adjustment Limits:
LINE OUT level: – 7.7 ± 0.5 dB (0.301 to 0.338 V)
Level difference between channels: within 2 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 13)
Playback Level Adjustment
Procedure:
Mode: FWD playback
Record BIAS Adjustment
Setting:
REC LEVEL control: Standard record position (See page 10)
Set to the TEST mode (REC MEMRY mode) (See page 10)
Procedure:
1. Mode: Record
set
AF OSC
attenuator
600
Ω
10 k
Ω
blank tape
CS-123
LINE IN
1) 315 Hz
2) 10 kHz
50 mV (– 23.8 dB)
2. Mode: Playback
+
–
set
LINE OUT
47 k
Ω
recorded portion
level meter
3. Confirm playback the signal recorded in step 1 become ad-
justment level as follows.
4. If these levels do not adjustment level, adjust the RV152 (L-
CH) and RV252 (R-CH) to repeat step 1 and 2.
Adjustment Level: Playback output of 10 kHz to playback
output of 315 Hz: ± 0.5 dB.
Adjustment Location: MAIN board (See page 13)
set
AF OSC
attenuator
600
Ω
10 k
Ω
blank tape
CS-123
LINE IN
315 Hz, 50 mV (– 23.8 dB)
2. Mode: Playback
+
–
set
LINE OUT
47 k
Ω
recorded portion
level meter
3. Confirm playback the signal recorded in step 1 become ad-
justment level as follows.
4. If these levels do not adjustment level, adjust RV153 (L-CH)
and RV253 (R-CH) to repeat step 1 and 2.
Adjustment Level: – 23.8 ± 0.5 dB (47 to 53 mV)
Adjustment Location: MAIN board (See page 13)