Tektronix 221 Instruction Manual page 36

TURN INSTRUMENT ON.
CHECK CHARGE INDICATOR
FULL
CHECK POWER
SUPPLIES FOR
CORRECT LEVEL
WITHIN TOLERANCE
MIDRANGE HORIZONTAL
AND VERTICAL POSITION
CONTROLS. SET TRIGGER
TO AUTO PRESET, INT.
TRACE APPEARS
CHECK VERTICAL AND
HORIZONTAL POSITIONING
POSITIONING
CHECK VERTICAI________________INCORRECT GAIN
GAIN
CHECK TRIGGERS---------------------- CHECK SWEEP TIM ING ---------------------- ADJUST SWP CAL
TURN INSTRUMENT OFF.
CONNECT INSTRUMENT
_____ LOW OR
TO LINE SOURCE, TURN
RECHARGE
INSTRUMENT ON. CHECK
CHARGE INDICATOR
ADJUST LOW
OUT OF
VOLTAGE
TOLERANCE
SUPPLY (10V)
NO TRACE
NO TRACE
SPOT ONLY ----------------
NO VERTICAL
POSITIONING
NO HORIZONTAL
POSITIONING
ADJUST VERT GAIN
Fig. 6-3. Circuit Isolation Troubleshooting Chart.
REV. APR 1974
LOW OR
RECHARGE
FULL
OUT OF ______ CIRCUIT, +5V REGULATOR
TOLERANCE
CHECKTRIGGER CIRCUITS
CHECK VERTICAL AND
HORIZONTAL AMPLIFIER
OUTPUT VOLTAGE LEVELS
CHECK BLANKING
CIRCUIT
CHECK HORIZONTAL
AND SWEEP
CIRCUITS
CHECK VERTICAL
DEFLECTION CIRCUITS
CHECK HORIZONTAL
DEFLECTION CIRCUIT
CHECK VERTICAL
DEFLECTION CIRCUITS
Troubleshooting Aids— 221 Service
CHECK POWER SOURCE,
LINE FUSE, LINE
CORD, POWER SWITCH,
BATTERIES CHARGER
CIRCUIT AND POWER
INVERTER CIRCUIT
CHECK 10 VOLT SUPPLY,
GROUND REFERENCE
HIGH VOLTAGE INVERTER
CIRCUIT (+48V, +75V
AND 1 kV SUPPLY)
6-3