Adjustment Procedure—2205 Service
TRIGGER
Equipment Required (See Table 4-1):
Leveled Sine-Wave Generator (Item 2)
50-0 Termination (Item 8)
50-0 Coaxial Cale (Item 6)
Alignment Too! (Item 11)
Dual-Input Coupler (Item 7)
See ADJUSTMENT LOCATIONS 1
at the back of this manual for adjustment locations.
INITIAL CONTROL SETTINGS
Vertical
POSITION (both) Midrange
MODE BOTH, NORM
and ALT
VOLTS/DIV (both) 50 mV
VOLTS/DIV Variable (both) Gal detent
AC-GND-DC (both) DC
Horizontal
POSITION Midrange
MAG XI
SEC/DIV 2 ns
SEC/DIV Variable CAL detent
Trigger
SLOPE Positive (_/“ )
LEVEL Midrange
MODE P-P AUTO
SOURCE CH 2
PROCEDURE STEPS
b. Connect the digital voltmeter low lead to
chassis ground and the high (volts) lead to TP350
(base of Q410).
c. CHECK—The offset voltage reading is less than
100 mV. Note the reading for use in part e.
d. Set the Trigger SOURCE switch to CH 1.
e. ADJUST—Trig Offset Bal (R338) so that the
voltage reading is the same as that obtained in
part c.
f. Set the Trigger SOURCE switch to CH 2.
g. Repeat parts c through f until there is 1 mV or
less difference in the voltmeter readings between
the CH 1 and CH 2 positions of the Trigger SOURCE
switch.
h. Disconnect the test equipment from the
instrument.
2. Adjust Trigger Sensitivity (R489)
a. Set:
Vertical MODE
CH 1 VOLTS/DIV
AC-GND-DC (both)
SEC/DIV
Trigger SOURCE
CH 1
0.1 V
AC
10 |iS
VERT MODE
1. Adjust Trigger Offset Ba!ance(R338)
a. Set the Channel 1 trace and the Channel 2
trace to the center horizontal graticule line using the
Channel 1 and Channel 2 POSITION controls.
b. Connect the leveled sine-wave generator out
put via a 50-fl cable and a 50-0 termination to the
CH 1 or X input connector.
c. Set the generator to produce a 50-kHz,
2.2-division display.
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