Service manual

35
VL-AX1U
1. EE level check
Measuring instrument Valve voltmeter Test point TL605, TL604
Mode P-ON (CAM), Zoom MIC "OFF", Adjustment rating -9dBs ± 3dB
Timbre mode "NORMAL" ,
Wind sound decrease "OFF"
Test signal 1kHz -54dBs sine wave
Procedure 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.
Remark TL6610: OPEN, TL6609: GND
2. Frequency character check
Measuring instrument Valve voltmeter Test point TL605, TL604
Mode P-ON (CAM) Adjustment rating
(1kHz standard) 100Hz: -11dBs ± 3dB
Parameter: Zoom MIC "OFF", 10kHz: 0B ± 3dB
Timbre mode "NORMAL",
Wind sound decrease "OFF"
Test signal 100Hz, 10kHz -54dBs sine wave
Procedure 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).
Remark TL6610: OPEN, TL6609: GND
3. Super-directional microphone check
Measuring instrument Valve voltmeter Test point TL605, TL604
Mode P-ON (CAM), Zoom MIC "TELE", Adjustment rating -10dBs ± 3dB
Timbre mode "NORMAL",
Wind sound decrease "OFF"
Test signal 1kHz -54dBs sine wave
Procedure 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.
Remark TL6610: OPEN, TL6609: GND
(Wiring board diagram: Sub Side B)
(Wiring board diagram: Sub Side A)
ADJUSTING THE MIC AMP CIRCUIT
C616
C603
TL3732
TL3736
TL3734
TL3735
TL3733
R603 R609
TL605
TL604
TL3731
TL3730
Q601
R663
TL3774
C686
R689
R686
Q608
C637
C646
C690
R
688
6
87
7
52
TL3742TL3739
C635
TL3738
TL3743
TL3737
TL602
TL3745
Q602
R610
TL3747
TL605
EE level
Frequency character
Super-directional microphone
TL604
EE level
Frequency character
Super-directional microphone
C6604
C6621 R6628 C6622
R6629
R6664 R6665 R6666 C6630
IC6601
C6610
C6602
C6607
R6603
C6605
R6615
R6624 R6604
R6611
C6611
Q6602
R664
3
C6650
R6625
R6612
C6608
C6603
R6626
R6627
TL6606
TL6607
TL6605
R3801
R3812
R3818
TL3715
TL3716
TL3725TL3722
TL6607(INT MIC R)
EE level
Frequency character
TL6606(INT MIC L)
EE level
Frequency character
SW3702
1
SC6602
TL6610
TL6608
TL6611
SC3703
TL2733
TL2759
TL2752
TL2754
TL2755
TL2753
SC3707
TL2756TL2757
TL2758
TL6601
TL6609
TL6609(GND)
EE level
Frequency character
Super-directional microphone
TL6608(TELE-MIC)
Super-directional microphone
TL6610(OPEN)
EE level
Frequency character
Super-directional microphone