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1.
Playback Frequency Characteristic Adjustment -
(VS-93 board)
Alignment tape:
For frequency characteristic
adjustment (WR5-6N)
Refer to Fig. 6-7.
Oscilloscope
43 (la-ch M.T), 45 (1b-ch M.T),
3F (2a-ch M.T), 41 (2b-ch M.T)
Adjusting method:
3.58 MHz level: 5.5 MHz level=
4: (3 + 0.3)
1)
Release the protect.
Page: 1, address: 00, data: 01
2)
Change the data of each address of page D, and adjust the
level ratio of 3.58 MHz and 5.5 MHz of each PB RF output
waveform of la, 1b, 2a, 2b to the specified value.
Note: After each address adjustment, be sure to press the
PAUSE button of the adjusting remote control unit
and memorize the data.
Pin © of CNOO2
(RF SWP)
Pin @ of CNO02
(1/2 RF SWP)
Pin @ of CNO02
(PB RF CH-1)
--AL.-.-.--
laddress 4
Pin @ of CNO02
Dn
(PB RF CH-2)
f
ie
1
2a
2b
address 3F
address 41
Fig. 9-7.
3.58 MHz
H: 2 msec/div
2.
Flying Erase Check (VS-93 board)
a
Frequency: Above 7.0 MHz
Species Wale
Voltage: Above 7.0 Vp-p
Note: Use a MP type tape.
Checking method:
1)
Check that the oscillation frequency is above 7.0 MHz and
that the oscillation voltage is above 7.0 Vp-p.
Above
7.0 Vp-p
=
Be Below 0.14 psec
Fig. 9-9.
3. VXO Osclilation Frequency Check (VS-93 board)
a
[Signal = Colorbar
Note: Connect the frequency counter via a high impedance
(approximately 10 MQ ) and low capacity (below 10 pF)
buffer.
Adjusting method:
1)
Check that the oscillation frequency of pin @ of IC152 is
3579545 + 70 Hz.
aa!
Above approx.
0.4 Vp-p
4
(3579545 + 70Hz)
Fig. 9-10.
— 244 —
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