6)
___________________________________ POWER light
Connect to correct power source does not come on
and pull POWER switch to ON
-
------------------------------------------
(out)
_____________________________
POWER
Check power source* line cord, fuse,
thermal cutout, POWER switch, power
transformer and POWER light buifc
light on
Check power
tolerance giver
supplies for
i in Table 4-3
Within
given
tolerance >
f >
t
Set vertical and horizontal
POSITION controls to mid
range, TIME/DIV to 1 ms
and the TRIGGERING Mode
switch to AUTO. Advance
the INTENSITY control set
ting
Outside
given
tolerance
Measure power line voltage
and check if instrument is
connected for correct volt
age (see section 2)
No
Yes
Connect instrument for cor
rect voltage and recheck
affected power supply (s)
Correct
Still
Incorrect
1
I
I
Check and/or ad
just affected sup
ply (s)
Trace does
not appear
Check sawtooth at pin A of
Horizontal Amplifier board
(about 30 volts peak to
peak)
Yes ^
Check sawtooth at either
horizontal deflection plate
(about 70 volts peak to
peak)
Yes |
Check unblanking gate at
Pin Y of Swp Trig/Swp Gen
board (about 0.1 volt peak
to peak)
No
No
No
Check Sweep Generator circuit
Check Horizontal Amplifier Circuit
Check Unblanking
Circuit (Sweep
Generator circuit)
Yes > r
Maintenance—Type 422 AC-DC
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