HCD-W55, MHC-W55, MHC-W77AV - Sony Audio Service Manual (repair manual). Page 8

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set
AF OSC
attenuator
set
AF OSC
attenuator
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
recorded
portion
set
VTVM
+
–
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.
1) 315Hz
2) 10kHz
69.0mV (–21dB) : STR-W55/W77AV
38.8mV (–26dB) : jig (PFJ-1)
blank tape
  CS-123
2. Playback mode
recorded
portion
Output level measurement point
(see page 6 )
set
VTVM
+
–
input point (see page 6)
blank tape
  CS-123
input point (see page 6)

Adjustment Level :
OUTPUT level : – 28dB 
±
 1.0dB (27.5 to 34.6mV)

Adjustment Location : MAIN board
Adjustment Location :

[ AUDIO BOARD ]  – Component side –

[ MAIN BOARD]  – Component side –
RV401 : Record Level (L)
RV451 : Record Level (R)
Record Bias Adjustment
DECK B
Procedure :
1. Record mode
315Hz, 69.0mV (–21dB) : STR-W55/W77AV
315Hz, 38.8mV (–26dB) : jig (PFJ-1)
RV301 : Playback Level (Deck B L-CH)
RV401 : Playback Level
(Deck B R-CH)
RV651 : Tape Speed (Normal)
RV652 : Tape Speed
(High)
RV311 : Playback Level
(Deck A L-CH)
RV411 : Playback Level
(Deck A R-CH)
RV441 : Record Bias (R-CH)
RV341 : Record Bias (L-CH)
CN151
Input/Output Point

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