Performance Verification and Adjustment Procedures
TSG 90 PATHFINDER Service Manual
3–10
Adjustment Procedures
Remove the PATHFINDER back cover before proceeding; see the instructions on
page 4 – 5. Power the instrument with the AC adapter while making adjustments.
1. Adjust Subcarrier Frequency
a. Connect the PATHFINDER Video Output to the NTSC Test Signal
Generator genlock input with a 75
Ω
coaxial cable. Terminate the
genlock input in 75
Ω
, if necessary.
b. Connect the NTSC Test Signal Generator subcarrier output to the
Frequency Counter A input, using a 75
Ω
coaxial cable.
c.
Connect a reference, such as WWV, to the B input of the Frequency
Counter.
d. Set the Frequency Counter for a ratio of A/B, and set the AVG to 106.
e.
ONLY IF NECESSARY remove the round metal foil tape cover from the
oscillator, Y1.
f.
ADJUST — the subcarrier frequency to 3.579545 MHz
±
0.5 Hz.
NOTE
. The subcarrier frequency specification is
±
10 Hz, but it is recommended
that this adjustment be made as close to 3.579545 MHz as possible to maximize
performance.
The crystal may drift after adjustment. Leave the PATHFINDER powered up for
20 minutes after adjustment, then recheck the frequency to verify that it has
remained within spec.
g. Reinstall the metal foil tape cover on the oscillator.
2. Adjust Audio Output Amplitude
a. Connect the PATHFINDER Audio CH 2 to the AA501 Audio Distortion
analyzer. Attach a 600
Ω
resistor to the analyzer’s + and – terminals to
represent the system load.
b. Set the PATHFINDER Tone Frequency and Click with these steps:
H
Open the Tone Menu by pressing SHIFT–TONE ON/OFF (press the
two keys simultaneously)
H
Use the
A
and
"
keys to set the TONE FREQ to 1 kHz.
H
Move to the CLICK ON/OFF selection with the
B
key.
H
Use the
A
and
"
keys, if necessary, to turn the Click OFF.
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