Sony TC-KB920S Service Manual page 12

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Record Level Adjustment
Setting:
REC LEVEL control: Standard Record (See page 10.)
Procedure:
1. Mode: record and playback
LINE IN
315 Hz, 50 mV (–23.8 dB)
AF OSC
10 k Ω
Attenuator
600 Ω
level meter
47 k Ω
+
–
2. Adjust RV101 (L-CH) and RV201 (R-CH) so that the reading
on level meter meets the adjustment limits below.
Adjustment Limits: –23.8±0.5 dB (47.2 to 53 mV)
Adjustment Location: MAIN board
Record EQ (IV) Adjustment
Setting:
REC LEVEL control: Standard Record (See page 10.)
TE
L 13942296513
Procedure:
1. Mode: record and playback
LINE IN
315 Hz
AF OSC
10 kHz
10 k Ω
Attenuator
600 Ω
level meter
47 k Ω
+
–
2. Adjust RV102 and RV202 so that they become maximum.
3. Adjust RV102 (L-CH) and RV202 (R-CH) so that the differ-
ence between R-CH and L-CH at 10 kHz is within 1 dB.
4. Adjust RV306 so that the R-CH meet the specification.
Adjustment Limits:
10 kHz level difference against 315 Hz reference.
0±1.0 dB
Adjustment Location: MAIN board
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CS-123
blank tape
set
LINE OUT
50 mV (–23.8 dB)
CS-123
blank tape
set
LINE OUT
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Adjustment Location:
[MAIN BOARD] – COMPONENT SIDE –
RV103
RV203
T101
T201
1 3
TP301
RV121
RV221
RV201 RV101
RV202
DOLBY-S
BOARD
J301
[AUDIO BOARD] – COMPONENT SIDE –
CNP73
Q Q
3 6 7 1 3
CNP71
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.
– 12 –
2 9 9 4 2 8
RV306
RV102
1 5 0 5 8 2 9 9 4
RV71
CNP72
m
co
9 9
2 8 9 9