Table of Contents
Advertisement
6.4
GENERAL INSTRUCTIONS
When encountering a problem, it is advisable to return
as many of the front panel controls as possible to their
initial settings and still retain the problem. The trouble
shooting tables in this section general i y begin at these
initial settings and specify all subsequent setups.
Preset the front panel controls as follows.
Control
Frequency Dial .... ...... ............. .. .. 4.0
POWER ....................... ......... . ON
... . .
FREO MULT (Hz)
..
.
.
.
.
. . . . . .
. . . . . . .. . . . .
FUNCTION.
.
DC OFFSET .
AMPLITUDE . . . . . . . . . . . . . . . . . . . . . . . .
CAUTION
To prevent d am age to components, turn
unit off while removing or replacing
components, connectors or pc boards.
The tuspected malfunctioning condition should be
double checked to eliminate the possibility of improper
settings o r connections. Before attempting fault isola
tion, the unit should be checked for proper line
voltage selection (refer to Section 2). A good visual in
spection of the boards and chassis wires for damage
or overheating often saves much time.
Once the malfunction is defined, begin the isolation
procedure by selecting an indication in table 6-1
Indication: Fuse blown, no power indication or no outputs.
1.
Set all controls in their initial positions (refer to paragraph 6.4).
2.
Ensure line voltage matches instrument configuration (refer to Section 2).
Check fuse.
Check C1 ( + ) and C2 (-) for
3.
4.
Check indicator lamp.
Check C4 ( + ) for + 15 Vdc.
5.
Check C5 ( -) for -15 Vdc.
6.
6-2
Position
........ . ... . . 1 K
.
ru
. . . . . . . . . . . .. OFF
. MAX
6·2.
Table
Power Supplies and Generator Loop
Check
±
20 to 26V unregulated dc.
which best describes the malfunction and proceed to
the referenced troubleshooting table.
Follow through the checks in the troubleshooting table,
using schematics and assemblies as a guide. When
positive results are not obtained, perform the in
dicated corrective procedure.
6·1.
Table
Fault Isolation
Indication
1.
Fuse blown, no power indication or no
outputs.
2.
Function outputs missing or clipped
when TIL sync OK. Triangle problem.
3.
Sine waveform problem.
4.
Square waveform problem.
TIL sync output problem.
5.
6.
Generator frequency does not respond
correctly to dial and VCG input.
7. Waveform symmetry problem.
8.
Problem on bottom three ranges only.
9.
Generator trigger and gate mode prob-
lem.
If Faulty, Check
Replace fuse; check for nor
mal operation.
a. CR1 - CR4.
b. C1, C2.
c. SW1.
d. T1, RV1, F1 (bracket as
sembly).
DS1 and VR2, wiring E34
and E33.
a. VR1.
b. Excessive
board jumpers to isolate
cause.
a. 02.
b. U2, Q1.
c. Excessive
board
cause.
Table
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-10
loading;
use
loading;
use
jumpers tOi50late
Hide quick links:
Advertisement
Table of Contents
