Sony HCD-D690 Service Manual - Page 34

Record bias Current Adjustment Procedure: 1. Mode: record DECK B Pin 6 (L-CH) of IC1501 on the main board. Pin #¶ (R-CH) of IC1501 on the main board. AF OSC 1) 2) 315 Hz 10 kHz    50 mV (-23.8 dB) blank tape 600 Ω attenuator CN-123 set Pin 2 (GND) of ICN207 on the main board. 2. Mode: Playback recorded portion level meter set + - CN207 (Pin 1 : L-CH) (Pin 3 : R-CH) Confirm playback the signal recorded in step 1 become adjustable limits as follows. If these levels do not adjustable limits, adjustment the RV341 (LCH) and RV441 (R-CH) on the AUDIO board to repeat steps 1 and 2. Adjustable limits: Playback output of 315 Hz to playback output of 10kHz: 0±0.5 dB Adjustment Location: AUDIO and main boards Adjustment Location: [MAIN BOARD] (Component Side) IC201 RV1501 IC1501 CN207 IC301 RV1551 CN205 RECORD LEVEL [AUDIO BOARD] (Conductor Side) RECORD BAIS RL RV301®L RV401®R RV441 RV341 PB LEVEL - DECK B - TAPE SPEED (NORMAL) (HIGH) RV651 RV652 ® ® RV311 PB L ® LEVEL RV411 R ® - DECK A - Record Level Adjustment DECK B Pin 6 (L-CH) of IC1501 on the main board. Pin #¶ (R-CH) of IC1501 on the main board. 315 Hz, 50 mV (-23.8 dB) AF OSC blank tape 600 Ω CS-123 attenuator set Pin 2 (GND) of CN207 on the main board. Procedure: recorded portion level meter set + - CN207 (Pin 1 : L-CH) (Pin 3 : R-CH) 1. Mode: record 2. Mode: Playback Confirm playback the signal recorded in step 1 become adjustable limits as follows. If these levels do not adjustable limits, adjustment the RV1501 (L-CH) and RV1551 (R-CH) on the main board to repeat steps 1 and 2. Adjustable limits: CN207 PB level: 47.3 to 53.1 mV (-24.3 to -23.3 dB) Adjustment Location: main board - 34 -