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3. Check of electromagnetic conversion circuit system (Auto check of playback envelope signal quality and error rate)
Mode
VCR adjustment mode
Procedure
1) Insert a recordable tape and enter the VTR mode.
2) Press the "CONTINUE" → "TEST SEL" keys on the remote control for adjustment to enter the TEST mode.
("T-01" is displayed on the LCD.)
3) Select "T-0F" using the FF or REW key and press the PB key.
4) LP recording of the color bar/rewind/playback and playback envelope/error rate are inspected automatically.
5) The results are displayed about 50 seconds after the start.
(1) ENV NG: Playback envelope signal amplitude or balance between channels is lower than standard.
(2) SYNC NG: SYNC error rate is lower than standard.
(3) ECC NG: ECC error rate is lower than standard.
(4) CK-OK: No problem.
* If one of the error inspections 1 to 3 is NG, the result is displayed and the test ends at that point.
(Inspections following that are not executed.)
6) Turn off the main unit to exit.
Examples
• When replacing the mechanism.
• When confirming a defect of the electromagnetic conversion system such as dirty video heads.
ADJUSTMENT OF VF CIRCUIT
(Wiring board diagram: Main Side A)
TL1207
TL7824(VF_G_OUT)
TL1812
VF_DAC full scale
C1815
C1813
TL1808
TL1809
TL1810
1. Setting data
Address
4AF
4B2
Data
77
30
2. Adjustment of VF_COM amplitude (Main PWB)
Measurement point
TL8801(VF_COM)
Procedure
1) Set the data value at address 5EB (TESTSW2) to 77.
2) Connect the digital voltmeter to TL8801 (VF_COM). At address 32 (VF_DAC_C), adjust the DC
3.5V ± 50mV
Adjustment rating
Examples
· Replacement of IC705
R710
R706
R707
TL8803
R740
C708
R736
R729
R759
C710
R735
C733
R755
R1801
C717
R738
R737
R763
R725
R720
C1801
R1822
R1821
R1820
C1811
R1827
R1800
R1823
C1804
R718
R1807
C1803
R771
C1810
C1802
R772
C1809
R1826
R747
R1804
R4402
C704
R1825
C1808
R1803
R4401
R1824
C1814
R1828
L1803
R1816
C1406
C1812
R6805
C6804
TL1451
R1419
L1802
L6800
C1407
R1402
R1422
TL6807
R1414
R1406
C1416
R1405
C1418
TL1452
C4421
R6800
Q1404
R6808
R1423
R6807
R6839
C6827
R6832
R6837
R6840
R6833
C4418
R4415
C4417
Q1405
C1419
C4424
C220
C219
R1421
R246
C4422
R219
C
4C1
4C4
582
58C
68
B0
48
90
voltage to the adjustment rating.
R1961
R1900
R1960
C1911
X701
C962
C978
Q1912
D916
TL903
D960
C929
R1926
R8807
TL904
R8804
C8806
Q8800
TL8801
Q8801
C8807
IC8800
D6800
TL7824
R8866
R4403
R6810
TL7805
C4442
TL7802
TL7801
FB4402
TL7804
TL4470
TL204
L7810
C7821
C7810
R7811
R7836
C211
C208
TL203
C207
C7827
IC4401
Address
VCR ADJ 32
31
VL-Z100S-S/H-S/E-S
VL-Z300S-S/H-S/E-S
TL8801(VF_COM)
Q905
VF_COM
L907
L901
R8806
TL911
TL907
C8803
C934
Q1901
TL910
R8803
C1901
C939
C8810
TL921
R8814
R8828
R8867
R1952
TL8802
C8813
Q3703
TL908
R8827
Q3702
Q3701
TL8809
R3711
TL3705
TL8806
TL8804
TL8805
TL8806(VF_VB)
VF_WB
TL8804(VF_VG)
VF_WB
TL8805(VF_VR)
VF_WB
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