SERVICE MANUAL

Record Bias Adjustment DECK BProcedure:1. Record mode1) 315 Hz ⎫69.0mV (–23.8dB) : STR-W550/W770AV⎬2) 10 kHz ⎭38.8mV (–26dB) : jig (PFJ-1)AF OSCblank tapeCS-123attenuatorsetAdjustment Level:OUTPUT level: –23.8 dB ± 1.0 dB (56.1 to 44.6 mV)Adjustment Location: MAIN boardAdjustment Location :[AUDIO BOARD] — Component Side —RV301 : Playback Level (Deck B L-CH)RV401 : Palyback Level RV651 : Tape Speed (Normal)(Deck B R-CH)2. Mode: PlaybackInput point (See page 6)RV341 : Record Bias (L-CH)RV441 : Record Bias (R-CH)RV652 : Tape Speed(Hight)RV311 : Playback Level(Deck A L-CH)RV411 : Playback Level (Deck A R-CH)3. Confirm playback the signal recorded in step 1 becomeadjustment level as follows.4. If these levels do not adjustment level, adjustment the RV341(L-CH) and RV441 (R-CH) to repeat steps 1 and 4.[MAIN BOARD] — Component Side —RV451 Record Level (R)Adjustment level: Playback output of 315 Hz to playback outputof 10 kHz: 0 ± 1.0 dB (0 ± 4.5mV).Adjustment Location: AUDIO boardRecord Level Adjustment DECK BProcedure:1. Record modeCNB108RV401 Record Level (L)2. Playback mode3. Confirm playback the signal recorded in step 1 becomeadjustment level as follows.4. If these levels do not adjustment level, adjustment the RV401(L-CH) and RV451 (R-CH) to repeat steps 1 and 4.— 8 —