Sony HCD-W55 Service Manual page 8

Record Bias Adjustment
Procedure :
1. Record mode
1) 315Hz
AF OSC
69.0mV (–21dB) : STR-W55/W77AV
38.8mV (–26dB) : jig (PFJ-1)
2) 10kHz
attenuator
input point (see page 6)
2. Playback mode
recorded
portion
set
3. Confirm playback the signal recorded in step1 become adjustment
level as follows.
4. If these levels do not adjustment level, adjustment the RV341
(L-CH) and RV441 (R-CH) to repeat step 1 and 4.
Adjustment level : Playback output of 315Hz to playback output of
10kHz : 0 ± 1.0dB (0 ± 4.5mV).
Adjustment Location : AUDIO board.
Record Level Adjustment DECK B
FUNCTION button : CD
Procedure :
1. Record mode
AF OSC
315Hz, 69.0mV (–21dB) : STR-W55/W77AV
315Hz, 38.8mV (–26dB) : jig (PFJ-1)
attenuator
input point (see page 6)
recorded
portion
set
Output level measurement point
(see page 6 )
2. Playback mode
3. Confirm playback the signal recorded in step1 become adjustment
level as follows.
4. If these levels do not adjustment level, adjustment the RV401
(L-CH) and RV451 (R-CH) to repeat step 1 and 4.
DECK B
blank tape
CS-123
set
VTVM
+
–
Output level measurement point
(see page 6 )
blank tape
CS-123
set
VTVM
+
–
Adjustment Level :
OUTPUT level : – 28dB ± 1.0dB (27.5 to 34.6mV)
Adjustment Location : MAIN board
Adjustment Location :
[ AUDIO BOARD ] – Component side –
RV301 : Playback Level (Deck B L-CH)
RV401 : Playback Level
(Deck B R-CH)
RV341 : Record Bias (L-CH)
RV441 : Record Bias (R-CH)
[ MAIN BOARD] – Component side –
– 8 –
RV651 : Tape Speed (Normal)
RV652 : Tape Speed
(High)
RV311 : Playback Level
(Deck A L-CH)
RV411 : Playback Level
(Deck A R-CH)
CN151
Input/Output Point
RV401 : Record Level (L)
RV451 : Record Level (R)