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Step `
Scope
Servo
No.
Mode
Range
Loop
1
SET UP
5mV div
SET UP
5mV div
3
SET UP
5mV
div
4
SET UP
5mV.div
5
SET UP
|
Шз
П Р Е
е
54
Test
Point
No.
TP-12
ТР-10
TP.3
ТР-1
TP-3/6
Adj.
Point
VR404
VR6
VR3
VR1
VC401
Adjustment and Check Details
When the adjustment mode is "SET ОР", connect
pin 1 of PSC& to GND, thereby the +12V and - 12V
lines on VSOP are activated.
• TANG
MIRROR
BIAS
Verify the voltage at ТР-12 is 0 + 20mV.
If not,
adjust VR404 to satisfy the above.
This step is necessary when VSOP is replaced.
• ТАКС
MIRROR
BIAS
Verify the voltage at TP-7 is 0 = 20mV.
If not,
adjust VR6 to satisfy the above.
This step is necessary when VSOP is replaced.
e FOCS
BRIDGE
BALANCE
Connect TP-10 to GND.
Measure the voltage at
TP-3 (ап offset voltage of 22}, then disconnect
TP-10 from GND.
Adjust УАЗ so that те voltage
at TP-3 will be 20mV lower than that measured
voltage.
This step must be finished within one minute after
the power is turned on.
• FOCS
OFFSET
INITIAL
SET
Verify the voltage at ТР-1 150 = 30mV.
if пої,
adjust МАТ
to satisfy the above.
• REF
Н FREQUENCY
Connect a frequency counter to TP-3/6.
Verify REF H frequency is 15734Hz.
1f not,
adjust VC401 to get near the above.
If you have an NTSC generator, connect CH-1 of
the scope to the H-SYNC
OUT of the generator,
and also connect CH-2 to TP-3/6.
With triggering
by CH-1 input, adjust УС401
to stop the current
of the waveform in CH-2.
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