Sony UVW-1800P Service Manual page 411

AR-14 BOARD
3. REC MODE ADJUSTMENT
3-1. Bias Trap Adjustment
Conditions for adjustment Adjustment point » Specifications
+ AUDIO INPUT CH-1/2; CH-1 CH-2
No signal TP106/ AR-14 (H-1) TP206/ AR-14 {A-1) ~
+ REC mode GND : £106 (H-1) GND : E206 (A-1)
Blank tape @ LVI01/ AR-14 (C-2) @ LV20I / AR-14 (A-2)
Spec. Bias leak > Minimize (<= ~- 30 dBu)
3-2, Bias Current Adjustment
Conditions for adjustment Adjustment point + Specifications
+ AUDIO INPUT CH-1/2; Step 1
No signal
+ REC mode TP! / AP-31 (H-1) TP201 / AP-31 (A-1)
Blank tape GND : TP2 J-1) GND : TP202 (A-1)
@T101/ AR-14 (C-4) © T201 / AR-14 (A-4)
Spec. Bias current + Maximize
Step 2
'TP1 / AP-31 (H-1) TP201 / AP-31 (A-1)
GND : TP2 (J-1) GND : TP202 (A-1)
@ RV301 / AR-14 (B-4) @ RV302 / AR-14 (B-4)
Spec.
AR-14 board (A Side)
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