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VL-Z7S/E/Z7E-A/Z7E-W
VL-Z8H
ADJUSTMENT OF MIC AMP CIRCUIT
(Wiring board diagram: Sub Side A)
TL1472
Checking of EE level
Checking of f characteristics
VA602
C601
R604
D7402
D7401
C1501R1501
C1503R1502
C1502C1508
1. Checking of EE level (Sub PWB)
Measuring instrument
Mode
Test signal
Adjusting method
Examples
2. Checking of f characteristics (Sub PWB)
Measuring instrument
Mode
Test signal
Adjusting method
Examples
Setting of MODEL ID
Address
Mode
Setting method
Examples
TL1470
Checking of EE level
Checking of f characteristics
CP3
CP2
CP1
C2905
R2901
R1480
C2906
Valve voltmeter
P-ON (CAM)
1kHz, -54dBs sine wave
1) Apply a 1kHz, -54dBs sine wave to TL3601 (INT MIC L) and TL3602 (INT MIC R).
2) Check that the signal levels of TL1472 Audio-L out and TL1470 Audio-R out satisfy the adjustment
rating.
Valve voltmeter
P-ON (CAM)
100Hz and 10kHz , -54dBs sine wave
1) Apply a -54dBs, 100Hz sine wave and then a 10kHz , -54dBs sine wave to TL3601 (INT MIC L) and
TL3602 (INT MIC R).
2) Check that the signal levels of TL1472 Audio-L out and TL1470 Audio-R out satisfy the adjustment
rating on a base of 1kHZ in each case.
VCR ADJ FD, FE, FF
VCR mode
1) Using command 12, select the VCR adjustment mode.
2) Using command 20, enable writing to the E
3) Set MODEL ID at each address.
Replacement of E
2
PROM (IC705)
(Wiring board diagram: Sub Side B)
C553
C554
C556
C558
C559
C561
R552
R553
R555
R559
1
Q2551
R2552
R2560
R2559
C3605
Measurement point
TL1472, TL1470
-8dBs ± 3dB
Adjustment rating
Test point
TL1472, TL1470
(On a base of 1kHZ) 100Hz : -6dBs ± 3dB
Adjustment rating
Setting rating
10, 20
2
PROM.
34
TL3601(INT MIC L)
Checking of EE level
TL3602(INT MIC R)
Checking of f characteristics
Checking of EE level
Checking of f characteristics
C573
C562
C574
P3602
R551
L551
R3639
C3646
R3631
C3632
C3634
R3634
R3633
R654
R3646
R610
R3632
C3631
R2556
Q2553
C3629
R2555
R623
R607
C3619 R3615R3617
R2551R2554
R661
R613
R615
Q3604
R620
C648
R3625
Q2552
C606
R617
R606
R3628
C610
Q2554
C643
C608 R616 R614
C2551 C620
10kHz : -3dBs ± 3dB
Address
FDh
Date
10h
R3636C3615
R3640
R3609R3641
C3640
R3610C3641
FEh
FFh
20h Z7S 44
Z7E 46
Z8H 5F
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