Performance Verification and Adjustment Procedures
TSG 90 PATHFINDER Service Manual
3–11
c.
Enter the diagnostic menu and go to TONE LVL0 with these steps:
H
Turn the PATHFINDER OFF and then ON while holding the
LOCKOUT button down.
H
Press the
Y
key repeatedly to reach the TONE LVL0 selection
(menu item 5).
d. ADJUST — R53 Tone Level for 0 dBu
±
0.05 dBu.
e.
Press the
B
key once to select TONE LVL4 in the diagnostic menu.
f.
Use the
A
and
"
keys to ADJUST the audio level to + 4.00
±
0.05 dBu.
g. Go to TONE LVL8 in the diagnostic menu (press the
B
key once).
h. Use the
A
and
"
keys to ADJUST the audio level to + 8.00
±
0.05 dBu.
i.
Reset the Audio Tone Frequency and Click to their previous states
(through the Tone Menu).
3. Adjust Test Signal Gain
a. Connect the PATHFINDER Video Output to the 1780 A Input and
terminate the loop-through in 75
Ω
.
b. Set the 1780 for waveform display of Ch A.
c.
Select the 5-Step signal from the PATHFINDER (press G).
d. Select the WFM + CAL function of the 1780 and set CAL to 714 mV.
e.
ADJUST — GAIN, R52, so that the top of the lower waveform just
touches the DC level of the upper waveform.
4. Adjust Test Signal DC Offset
a. Set the 1780 Coupling to GND and adjust the monitor trace to a
convenient ground reference.
b. Change the 1780 input coupling to DC.
c.
ADJUST — DC OFFSET, R7, to set the 0 IRE point of the 5-Step signal
to the established ground reference
±
2 mV.
d. Repeat steps 3 and 4 as necessary for best results.
5. Adjust Frequency Response, 2T Ringing, and (SIN X)/X Compensation
NOTE
. Step 5 contains several interactive adjustments. Repeat this step until the
best overall response is obtained.
Содержание TSG 90 PATHFINDER
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