Tektronix 213 DMM Instruction Manual page 132

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l
C
L
START
TURN
INSTRUMENT
ON
CONNECT
INSTR PWR
PLUG TO PWR
LINE
CHECK LINE
INPUT, LINE
FILTER, & POWER
LINE RECTIFIER
CHECK
AND ADJUST
POWER
SUPPLIES
CHECK POWER
SWITCH
CIRCUITRY
CHECK AND
CHARGE
BATTERIES
CHECK
>--ii...-,~ INVERTER AND
REGULATOR
REPLACE
R447
REPLACE
F410
SET INSTRUMENT
FOR A NORM SWP
DSPL IN SCOPE MODE
OF OPERATION
CHECK LOW
VOLTAGE
SHUTDOWN
CIRCUIT
CHECK AND
ADJUST PWR
SUPPLIES
CHECK
BATTERY
CHARGER
CONVERTER
CHECK CRT Cl RCUIT
CONTROLS AND
VOLTAGES
CHECK LED
AND LED
CIRCUITRY
I•
CHECK BTRY
CHARGER
REGULATOR
CHECK
SUBSTRATE
CHECK Z AXIS
AMPL AND
BLANKING
CIRCUITRY
CHK & ADJ
SWEEP
GENERATOR
CHK SCOPE
HORIZ AMPL &
HORIZ OUTPUT
AMPLIFIER
CHECK CRT
HORIZ DEFL
SENSITIVITY FOR
8.2 to 9.2 V/DIV
CONNECT AN AC
INPUT SIGNAL AND
YES
ADJUST CONTROLS
I-_.,~
SET INSTR
CONTROLS FOR A
DMM DCV
MEASUREMENT
SET INPUT
COUPLING TO GND
FOR A STABLE
DISPLAY
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CHECK INPUT
ATTENUATOR
CHECK INPUT
BUFFER AMPL FOR
l0X GAIN ON 5mV
& l0mV RANGES,
AND IX GAIN ON
ALL OTHER RANGES
CHECK R128,
R129, AND
SCOPE PREAMP
CHK VERT
OUTPUT AMPL
CHK CRT VERT
DEFLECTION SENS
OF 12.8 to 14.1 V /div
LEGEND
LOGIC DECISION STEP: A performance check
that results in a logic decision to determine the
next step in the troubleshooting process.
ACTION STEP: A step involving setting of con-
trols; component or part checks; voltage, wave-
form, or resistance checks; repair; and recali-
bration.
To use this chart, begin at START and perform any instrument perfor-
mance checks necessary to answer the question in the Logic Deci'sion
Step on the top . horizontal flow line of the chart. Whenever a negative
logic decision (No) is reached, perform each Logic Decision Step and
Action Step in the sub-flow lines of the chart until the original logic
decision (No) is corrected to a positive logic decision (Yes).Then conti-
nue through the chart until the END is reached, at which time the
Instrument Performance Check should be performed and the instrument
calibrated as required.
Fig. 9-24. Troubleshooting chart.