Sharp VL-NZ50S Service Manual page 29

ADJUSTING THE MIC AMP CIRCUIT
(Wiring board diagram: AIO Side B)
TL2692(INT MIC L)
EE level check
Frequency character check
TL2691(INT MIC R)
EE level check
Frequency character check
1. EE level check
Measuring instrument Valve voltmeter
Mode P-ON (CAM)
Test signal 1kHz -54dBs sine wave
Procedure 1) Input 1kHz, -54dBs sine wave into TL2692(INT MIC L) and TL2691(INT MIC R).
2) Make sure that the signal level of TL608 Audio-L out and TL609 Audio-R out is within the standard
Remark TL607: GND
2. Frequency character check
Measuring instrument Valve voltmeter
Mode P-ON (CAM)
Test signal 100Hz, 10kHz -54dBs sine wave
Procedure 1) Input 100Hz, -54dBs sine wave and then 10kHz, -54dBs sine wave into TL2692(INT MIC L) and
2) At this time make sure that the signal level of TL608 Audio-L out and TL609 Audio-R out is within the
Remark TL607: GND
TL609
EE level check
Frequency character check
TL607(GND)
EE level check
Frequency character check
TL607 TL2680
TL2692
TL2691
TL2673
TL2675
TL2674 TL2672 TL2671
limits.
TL2691(INT MIC R).
standard limits (1kHz standard).
TL608
EE level check
Frequency character check
TL609
TL608
C639
R608
R624
R630
R631
R629
R632
C631
C620
R628
C628
C613
TL2644
C612
C614
R643
IC601
TL605
TL606
C625
Test point
Adjustment rating
Test point
Adjustment rating
29
VL-NZ50S/H/E/W/NZ80H
VL-NZ100S/H/E
TL26
TL
TL608, TL609
-8dBs ± 3dB
TL608, TL609
(1kHz standard) 100Hz: -9dBs ± 3dB
10kHz: -1dBs ± 3dB