Table of Contents
Advertisement
SECTION 3
Service Infbrmation
3.7.3
Board-Level Repair
Table 3-4 summarizes which of circuit boards is most
likely at fault for the various operating modes. Paragraph
3.8 below lists replacement boards and certain other
parts. If board replacement fails to fix the problem, the
most likely cause of the fault is the wiring between the
boards.
Table 3-4. Board Level Repair Summary
Problem
Probable Cause
1. DC OFFSET VAR
2. OUTPUTATT
3. FCTN OUT ON/OFF
4. START/STOP PHASE VAR
5. WAVEFORM
6. AMF'LITUDEVAR
7. CONT MODE
8. GATE MODE
9. AM
10. FREQUEkCY VAR
Il.
DUTY CYCLE VA&
12. DTJTY CYCLE STABILITY
13. BURST MODE
14. FREQUENCY SWEEP
15. SYNC OUT
16. INT TRIG OUT
17. SWEEP MKR OUT
18. SWEEP SYNC OTJT
19. XDRIVEOUT
B
i
A
AorB
B
A
A'
B
A
A or B
B
A
A
B
A
A
A
A
A: Control circuit board 0JFW408)
B: Analog circuit board WI'-21022)
3.8
REPLACEABLE PARTS
3.8.1
Parts List
Table 3-5 summarizes available Model 3930A replace-
ment parts. Figure 3-9 shows the location of mechanical
Parts.
3.8.2
Ordering Parts
To order a part, or to obtain information on replacement
parts, contact your Keithley representative or the factory.
When ordering parts, include the following information:
l
Instrument model number
0 Instrument serial number
l
Keithley part number
l
Part description
Table 3-5. Replaceable Parts
Description
Analog circuit board
WI?-10408A)
Control circuit board
(NP-21022B)
Fan
Air Filter
Flat head screw
(for air filter)
Fuse holder
Noise Filter (AC Receptacle)
BNC connector
Power switch (internal)
Power switch
(on front panel)
Flexible wire
(for power switch)
Voltage selecting switch
Rotary encoder
Ground terminal
LCD
EL back light (for LCD)
Power transformer
Rear panel
Hexagonal stud
Grommet
SW Spacer
(for power switch)
Collar (for LCD)
BNC bushing
BNC spacer
Spacer (for rotary encoder)
Hexagonal spacer
(for power switch)
Knob (for rotary encoder)
Button (for power switch)
Hexagonal stud
(for NP-10408)
Standoffs (for N&10408)
Battery (rechargeable)
Fuse (100/12Ov)
Fuse (22Oj24Ov)
Part number not available at time of
department.
: pr:
Part
Number
080-33617-OC
080-33625-OC
300-00718-OC
459-00205-0c
600-01241-OC
302-04054-OC
240-03328-OC
310-00347-0(3
332-19141-oc
332-19133-Oc
332-19150-06
332-50057-OC
332-90041-OC
330-05389-00
304-10118-00
lOO-70028-OC
244-10896-00
400-11721-00
606-00187-OC
546-00146-00
520-05356-00
606-02236-00
446-00046-00
540-00157-00
520-05976-00
606-01892-00
486-24060-00
359-03554-00
606-00101-00
529-00185-00
*
FU-96-2
Fu-96-l
Qty.
1
1
1
:
1
1
4
1
1
1
1
1
1
1
1
1
:
3
1
4
4
4
1
2
1
1
2
4
1
1
1
inting; contact repair
3-12
Advertisement
Table of Contents
