Sharp VL-AX1S/H Service Manual page 32

VL-AX1S/H/E/EW/EX
ADJUSTING THE MIC AMP CIRCUIT
(Wiring board diagram: Sub Side A)
752 TL3742 T L3739
TL3743
C635
TL3738
687 R689 R663
Q608
R688 R686
TL3774
C686
C646
C637
TL3722 TL3725
TL3716
TL3715
TL6606(INT MIC L)
EE level
Frequency character
1. EE level check
Measuring instrument
Mode
Test signal
Procedure
Remark
2. Frequency character check
Measuring instrument
Mode
Test signal
Procedure
Remark
3. Super-directional microphone check
Measuring instrument
Mode
Test signal
Procedure
Remark
TL3747
TL605
TL3745
EE level
TL602
TL3737 R610
Frequency character
Super-directional microphone
Q602
TL3730 TL605
C603
TL604
Q601
C616
EE level
TL3731 TL3733
Frequency character
TL604 TL3735
Super-directional microphone
TL3734 TL3732
TL3736
R6615
R3801 R6611
C6605
R3818
TL6605 C6603
R6603
TL6606
IC6601
R3812
C6608 C6607
Q6602
TL6607 R6612
C6602
C6604
R6629
TL6607(INT MIC R)
EE level
Frequency character
Valve voltmeter
P-ON (CAM), Zoom MIC "OFF",
Timbre mode "NORMAL" ,
Wind sound decrease "OFF"
1kHz -54dBs sine wave
1) Input 1kHz, -54dBs sine wave into TL6606(INT MIC L) and TL6607(INT MIC R).
2) Make sure that the signal level of TL605 Audio-L out and TL604 Audio-R out is within the standard
limits.
TL6610: OPEN, TL6609: GND
Valve voltmeter
P-ON (CAM)
Parameter: Zoom MIC "OFF",
Timbre mode "NORMAL",
Wind sound decrease "OFF"
100Hz, 10kHz -54dBs sine wave
1) Input 100Hz, -54dBs sine wave and then 10kHz, -54dBs sine wave into TL6606(INT MIC L) and
TL6607(INT MIC R).
2) At this time make sure that the signal level of TL605 Audio-L out and TL604 Audio-R out is within the
standard limits (1kHz standard).
TL6610: OPEN, TL6609: GND
Valve voltmeter
P-ON (CAM), Zoom MIC "TELE",
Timbre mode "NORMAL",
Wind sound decrease "OFF"
1kHz -54dBs sine wave
1) Input 1kHz, -54dBs sine wave into TL6608(TELE-MIC).
2) Make sure that the signal level of TL605 Audio-L out and TL604 Audio-R out is within the
standard limits.
TL6610: OPEN, TL6609: GND
TL6609(GND)
EE level
Frequency character
Super-directional microphone
TL6608(TELE-MIC)
Super-directional microphone
TL6610(OPEN)
EE level
Frequency character
Super-directional microphone
(Wiring board diagram: Sub Side B)
Test point TL605, TL604
-9dBs ± 3dB
Adjustment rating
Test point TL605, TL604
(1kHz standard) 100Hz: -11dBs ± 3dB
Adjustment rating
Test point TL605, TL604
-10dBs ± 3dB
Adjustment rating
32
TL2755
TL2754
TL2752
TL2759
TL2733
TL6609
TL2753
TL2757 TL2756
TL6601 TL2758
SC3703
TL6611
TL6608
TL6610
10kHz: 0B ± 3dB