Tektronix Type 82 PLUG-IN Instruction Manual page 37

TABLE 4-5
Trouble Isolation Procedure
Maintenance—Type 82
Possible Causes
Area at Fault
17, Low gain in channel A, deflection
about three, Gain switch set to X1***.
Check for shorted D572.
Switching Multivibrator @Q565-
Check for trouble in the Switch-
ing Multivibrator @Q565-Q575
stage.
19. Low gain, one channel. Deflec-
tion factor decreased by a factor of
Check for trouble in the Input
Amplifier of the channel at
20. Low gain in one channel for all SN 101-2999
fault.
SN 3000-Up
Check for trouble in the Input
Amplifier of the channel at
21. Low gain in one channel for only
one position of the V/CM_ switch.
GAIN switch set to X1.***
22. No de coupling of the signal.
23. Trace shifts position vertically
when the INPUT connector center con-
ductor is grounded.
les in the Input Cathode Fol-
lower stage V133 or V233, de-+
24. Low gain in one channel when
Check the transistors in the channel at fault.
Amplifier of the channel at
25. No waveform display using either
channel but trace can be obtained.
Shorted capacitor: C539, C549, or C554.
Check for open R554.
Check for no +12.6-volt supply voltage.
26. No waveform display when using
one of the channels. GAIN switch set
Open circuit between INPUT connector and
fault; between INPUT connector and R217 and
R226 if Channel B is at fault.
SN 101-2999
For Channel A: check for shorted C117 or C127.
For Channel B: check for shorted C217 or C227.
depending on channel at fault.
27. No waveform display when using
one of the channels. GAIN switch sef
to X10.
Coax cable shorted to ground at either the in-
put or output of the X10 Amplifier at fault.
Amplifier of the channel at
fault. Refer to Part 1B.
4-13