Repair Instructions
 Sears
SIMPSON 260 METER
© REPAIR PROGRAM
- DIVISION 92
SOURCE 260
MAY, 1976
A .
+
so и
“ни
This booklet is designed as a simple trouble shooting guide to
repair a Simpson 260 meter in your Service Center. All repairs
are NOT covered, only the easy repairs that do not require
major recalibration. If after following the enclosed procedure
the problem has not been resolved, return the meter to the
authorized repair source for your Territory. |
A complete schematic and parts location list is included for
your convenience for Model Series 3, 4, 5, 5P, 6, and 6P.
Repair parts are available from your Territorial Repair Parts
Distribution Center. These parts are listed on ultrafiche in
Division 92, Source 260.
. г
x ”
me”
SERVICE PROCEDURE - SIMPSON 260-3-4-5-5P-6-6P
THE FOLLOWING TESTS CAN BE
PERFORMED TO DETERMINE
DEFECTS AND DEFECTIVE
COMPONENTS:
1. Set the instrument on the Rx1 range,
short the test leads together and adjust
the zero ohms for zero indication on the
meter. If the pointer falls short of zero,
REPLACE THE 1.5 VOLT “D” SIZE
BATTERY. This should restore normal
operation.
2. Next, set the 260 to the Rx10K range and
adjust for zero ohms. If the pointer will
not reach zero, change the four penlite
batteries. (This applies to the 260-3 thru
the series five.) In the 260-5P, change the
15 volt battery. In the 260-6 and 6P, this
battery is a 9 volt transistor radio type
(NEDA 1604).
3. If the pointer does not deflect.in Steps 1
and 2, remove the test leads from their
jacks and short the “common” and
“plus” jacks together with a paper clip.
The 260 should still be set on a resistance
range while making this check. If the
pointer moves, REPLACE THE
DEFECTIVE TEST LEADS.
4. If the pointer did not deflect in Step 3
(260-3 thru 260-5P) remove the
instrument case and check the internal
fuse.
On the 260-6 and 6P, this fuse is
accessible through the battery
compartment.
5. If Steps 1 to 4 do not locate the trouble, or
if the problem involves a single range
only (such as Rx1 or 1 MA) then an odor
or visual test should be made to locate a
burned resistor. The location of the
components are as shown on the
drawings for the ranges most likely to
cause difficulty.
NOTE
1: If a resistor burns out and causes the
printed circuit board to become
crystalized, the entire board must be
replaced because a degree of continuity
is often set up across this area. This
causes inaccuracies in the instrument
and usually another breakdown in a
short time.
NOTE
With the instrument out of the case be
sure to check the switch decks for
smoked areas or burn marks between
contacts. If there is evidence of burn or
arc marks, return unit to your
authorized repair center.
NOTE
Switch replacement, COMPLETE
calibration, meter movement replacement,
or repair is considered a factory repair.
Send the complete unit to your Authorized
Repair Station.
OVERLOAD RELAY ADJUSTMENT
(Model 260-5P and 260-6P)
NOTE
Field adjustments of the Overload Relay
Leaf Switch causes intermittent or erratic
operation of the unit. Replacement is
recommended.
The mechanical adjustment of the relay is
performed as follows;
a.
Refer to the drawing to locate the
adjustment screw for the relay latching
function. This can be adjusted with a
small jeweler’s screwdriver while the
reset button is pushed in.
. With the reset button depressed, turn the
screw out until it does not catch on the
relay. No more than one or two turns
should be required.
. Short the common and plus terminals
and set the range and function switch on
Rx100 and plus DC. This will provide an
indication on the meter when the relay
contacts are open or closed. Meter will
read full scale when contacts are closed.
d. Now push the reset button and turn the
screw clockwise until it just catches on
the relay. This is to be done in small
increments while allowing the button to
spring in and out until it snaps into the
hole.
e. The mechanism should be operated two
or three times to be certain the latching
and switch function is consistent. This
can be accomplished by finger
continuity between shunt R22 and the
positive terminal of the 15 volt battery.
Push in the reset button and then connect
the two points together with the fingers.
This should cause the relay to release as
indicated by the button “popping out”.
NOTE
Finger contact at various points in the
tester can cause the relay to release. Do not
mistake accidental finger contact with the
circuitry with a defective relay or its
adjustment.
ANY REPAIR NOT COVERED IN THESE
PROCEDURES IS CONSIDERED A
FACTORY REPAIR.
TROUBLESHOOTING CHART, MODELS 260-3 THRU 260-6P
с. Defective cali-
bration control
d. Defective re-
sistor
SYMPTOM POSSIBLE DEFECT CURE NOTES
1. Rx! will not zero a. Defective “D” a. Replace
with shorted in- Battery
put. b. Open resistor b. Replace| b. 260-3 thru 5P
= R1,3,16,25.
260-6,6P =
R16,17,19,21.
с. Defective range c. See switch re-
switch placement
2. Rx10k will not a. Defective battery a. Replace! a. 260-3 thru 260-5
zero with shorted B2=4 “AA” cells.
input. 260-5P B2 - Ever-
eady 417 or Equiv.
260-6,6P B2 = 9v
NEDA 1604
b. Open resistor b. Replace| b. 260-3 thru 5P = R4
260-6,6P - R18
с. Defective range c. See switch re-
switch SW1 placement
3. Rx100 will not a. Open resistor a. Replace | a. 260-3 thru 5P = R2
zero with shorted 260-6,6Р = R18
input b. Defective switch b. See switch re-
SW-1 placement
4. 7.5 VAC range a. Open diode D1 or a. Replace] a. See calibration
reads approx. 1/2 D2 procedure
the actual voltage
5. Out-of-tolerance a. Calibration a. Recali- | a. See calibration
indication at full required brate procedure
scale on 2.5 VAC b. D1 or D2 de- b. Replace
range fective
с. Replace] c. 260-3 thru 5P =
R28,31
260-6,6P = R22,25
d. Replace| d. 260-3 thru 5P =
R26,29,30
260-6,6P = R23,24,
26
TROUBLESHOOTING CHART, MODELS 260-3 THRU 260-6P
SYMPTOM POSSIBLE DEFECT CURE NOTES
6. AC voltage range(s) Defective re- a. Replace {a. 260-3 thru 5P =
defective sistors R6, 7, 9, 13
260-6,6P = R27
thru R30
Defective range b. See switch re-
switch SW-1 placement.
7. DC current Open shunt re- a. Replace la. 260-3 thru 5P =
ranges de- sistor R5,17,18,19,22.
fective 260-6,6P = R11
thru R15.
Defective range b. See switch re-
switch (SW-1) placement.
8. DC voltage Open multiplier a. Replace |a. 260-3 thru 5P =
range(s) de- resistors R8,10,12,14, and
fective 15.
260-6,6P = R4
thru R8
b. Defective range b. See switch re-
switch (SW-1) placement.
CALIBRATION CHECK 250 VAC RANGE CALIBRATION
DC VOLTAGE RANGES can be checked for
accuracy by using a battery of proper
voltage for the range being checked while
monitoring the battery voltage being
applied across the test leads with another
260 or equivalent meter.
RESISTANCE RANGES can be checked
for accuracty by measuring a known value
of resistance with the instrument.
AC VOLTAGE CALIBRATION
When the diodes or resistors in the bridge
rectifier have beenreplaced, the 250 AC and
2.5 VAC ranges must be calibrated.
Using the line voltage from an AC outlet as a
calibrating voltage source and an accurate
AC monitoring voltmeter, connect the test
leads and adjust R31 (260-3 thru 260-5P) or
R22 (260-6 and 6P) for the same reading as
the monitoring voltmeter.
2.5 VAC RANGE CALIBRATION
Using an oscillator set to 1 volt RMS output
at 60 hertz as read on a monitoring AC
voltmeter. Set the 260 range switch to the 2.5
VAC range and connect the test leads to the
monitored 1 VAC output of the oscillator.
Adjust R28 (260-3 thru 260-5P) or R25 (260-6
and 6P) for the same reading as the
monitoring voltmeter. This completes the
AC calibration. SEE NOTE ON
FOLLOWING PAGE.
Simpson 260-3 & 4 Parts Location
NOTE: 260-3 DOES NOT USE R-32
a +
==
=
i
ok
: 3 =
POSITION 1 OF THIS SECTION-
IS CONTACT ARM
1
| 1000 V ! = / la!
= SMEG LAT
2 250 V => + 2
= DRM CALIBRATED TO 5000 0.
3 V < 4 MEG. 3
ла = <R-8 *
= + 1800.00 AM
R-10 45,000 *
6 sooMA No R-32 6
7 OMA Bo 3? ZR-I7 200,000 7
Е Faas
8 IOMA Tee. 8
imps à = 255 |
9 MA 3238 №6 112 9
| AV
Bi 15V
Юй = - '0 y
x 2 R21
| R=100 = Ba AW Uy
= E R4 117700
12 R= a AM 2g
ZERO OHMS
p------- + —— | FUNCTION SWITCH-j— ~~ — ~ = ~~ — ~~~ 7
t >
A A 5 +
ый R-22 .025
— сё в
1 -
C-1 | AMP, 250 V
O MFD 400WY
0 wes—()
50.ua D.C. AC. POS. OUTPUT COM. + —
5000V. 5000V.
ty
D
do
=
m
”
о пост
db o o
g ®
> VS Y * YY
x
ts
A
in
o
o
-1000.V.D.C POS SHOWN IN
MEG.=
ALL REST Stat RS ARE
QSATION.
= 1,000,000 OHMS
UNLESS
СНЕ RWISE SPECIFIED
*R32 is adjusted for a circuit current of 50 microamperes, then R27 is adjusted for a circuit resistance of
5,000 ohms.
OVERALL SCHEMATIC. SIMPSON VOL T-OHM-MILLIAMMETER 260
PESITION “1 OF THIS SECTION
15S CONTACT ARM
= = === === ===> === с не же ке =
SERIES 4 & SERIES 4M
| 1000 V ! |
ЕН 3 vea
2 250v SISMEG 1-WATT 2 33
- 2 ri CALIBRATED T0 5000 £3 в >
3 50 V Z 4 MEG. 3 3
50ua | * > R-8 в 3
4 10V " 3 e 4 5 3
= 150,000 :
5 25V — 000. 5 |
R-10 45,000
6 SOOMA Mm — ‘ 6
= R19 В
7 ICO MA 3 ZRI7 | 7
в 2 ris 20.452
8 10 MA в Tes a
AMPS SR-5
9 IMA = $238 9
B1 ISV
10 Rai lo
+! -
it R=100 _ H
— Be
x = 6\
12 R= 00008 o 36 12 "E
ZERO OMMS © 4000
poo == | FUNCTION SWITCH-|—————---—-——- 7
' > |
I +
A -ocq АЦ А |
B +DC B a B —— R22 .025
cC ACH #—mm 1 cl »—— сё =
VW é - Fi
R-20 Sac с. | AMP, 250 V _ SWITCHES SHOWN IN
BOMEG ZWATT R-21 0.1 MFD 4000 Y т
O MEG. = 000,000 ONMS
O Ye 20.2 MEG 2WATT с 10 AUPS ALL RESISTORS A ARE
aa € AC. | OUTPUT OM.
5006. ОМ, POS + OTHERWISE SPECIERD
OVERALL SCHEMATIC, SIMPSON Y OLT-OHM-MILLIAMMETER 26
O SERIES IH
D6 Thru R11
under overload
protection module
DE
ar
07
dr
era =
Simpson 260-5 & 5P Parts Location
NOTE: 260-5 DOES NOT HAVE
PROTECTION BOARD
POSITION 1 OF THIS SECT SON
IS CONTACT ARMES ——RANGE SELECTOR SWITCH — ——
| 1000 Y
R-9
2 250 Y 2 3.75 MEG. +WATT
y 3 ¡MEG
3 тома R-7 |
4 ov 200,000
R-6
5 25V 37500
R-c6
6 500 MÁ 7500
7 ЮО МА Rae
8 10M
AMES
9 1 MA D-2
SWITCHES SHOWN IN
e V. 0 ANA
TT Re
5000V. 5000V. ERWI
Fi
1 AMP, 250 V
SCHEMATIC DIAGRAM
MODEL 260-5
R25
ZERO Gums |
R24
= = ———
™
TT
=" a
A NL
Pt Te Pe Ae Tt es Pr,
on PPA af A R22
| ‘
|
10 AMPS
| PA Sw-2, DECK-IR O
\ - - \ — +
- - 7 Te [a
| | 7 в + y 5 Sw-4
| geet 2F G 345 В, C8 0 ? 12 (RELAY CONTACIS} 7
к. a 9 DECK- © a FI
4 „Ты ыы Pa | OD —
и NE A COMMON
| = !
1
R19 R18 RS
| ® ©—
| Sw-2, DECK-1F
! < < 5 | -
-- > < << o x м I
à 3 238 à 9 E E E o. 8 © 2 8° % [or SB e
o un uu - N 5 9 ce - x x x | + 400 wy
POS. OUTPUT AC
5000v 5000v
MODEL 260-5P - SCHEMATIC
he
E
ty
‘om
ka
ae
Luk
(= |
ih
re =
wi
a
LE
a
pi
La
Pa
e
hue
ee
oa
AR
EA
a
Le
i
In
| ETA 1
Simpson 260-6 & 6P Parts Location
NOTE: 260-6 DOES NOT HAVE
PROTECTION BOARD
FUNCTION SWITCH
1 —DC y
2 +aC
3 AC
+ JOLUAMPS +iv 1000V. + OUTPUT COMMON +10A. 104.
250MV AC. DC
SCHEMATIC DIAGRAM
MODEL 260-6
— — Biel ети = = — = има ——
SwW-1
RANGE ЗМИТСН—— -- — — —— — — — — — —— —— ——— ——
+1.
1
e
y #
5oov.
IGOON.
250V.
MY,
зо“.
H AMPS,
10V.
2.5V.
Y.
500 MA.
TRANSIT
100мА. Ш B————a | | TB Ш о ———;--
I
19 MA.
AMPS
LMA.
EXT
RX 10
RX 19,000
RANGE SWITCH 13 IN
FUNCTION SWITCH IS IN
UNLESS OTHERWISE SPECIFIED:
RESISTOR VA
LUES AR
CAPACITANCE 15 IN
K = 1,000 OHMS
IM
MICRO
1,000,000 OHMS.
SCHEMATIC DIAGRAM
+ и MODEL 260-6P
VOLT POSITION.
D.C. POSITION.
E IN OHMS.
FARADS.
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertising