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OHMS
CHECK POWER SUPPLIES
G
I
CHECK DC VOLTS
I
REPLACE LAMP DS1410.
ALSO CHECK CR1301
A N D
C R 1 3 0 2
FOR
GOOD?
LEAKAGE. THEY MAY
HAVE BEEN DAMAGED
W H E N
L A M P
W A S
y
u
INPUT SHORTED
I S
DISPLAY
E-i,
2,
3
ZERO
w
Yes
7 1
CONNECT
A
KNOWN RESISTOR TO
DM
INPUT
WHICH
I S
CLOSE IN
VALUE TO FULL
SCALE.
MEASURE
VOLTAGE
FROM VOLTSIR TO
LO
INPUT.
FOR FULL
SCALE READING.
VOLTAGE
ACROSS
RESISTOR
BEING MEASURED SHOULD B E
0.2
v
FOR 200
n
RANGE; 0.2
v
FOR
L O
L-2
AND REST OF RANGES AND 2 V
FOR HI R AND
REST OF RANGES.
N O T E
T H A T
R E S I S T A N C E
MEASURED
BY DM 505 WlLL BE
PARALLEL
COMBINAT ION
OF
R E S I S T O R
AND
T E S T M'ETER
RESISTANCE.
t
CHECK PATH FROM VOLTS/fi INPUT
TO
A D C
INPUT
(U1201-15).
VOLTAGE
A T
THESE
POlNTS
S H O U L D
B E
E Q U A L .
WMEM
MEASURING VOLTAGE AT U1201-15
THE
MEASUREMENT
DEVICE
READfNG WlLL BE THE UNLOADED
VOLTAGE MULTIPLIED
..arr,
WHERE
Am
IS
MEASUREMENT
DEVICE RESISTANCE.
MEASURE
VOLTAGE
FROM
U1311-2
T O
U1311-6. IT SHOULD
BE
10
V
ON 200
fi
RANGE;
l O V
FOR
M I R
AND
REST OF
RANGES; AND
1 VFOR PO
n
ANDREST
OF
RANGES.
CHECK
C U R R E N T
SOURCE
Q1311 AND
ASSOMATED COMPO-
NENTS. IF THESE ARE
OK,
CHECK
R1304,
R1413,
R1305.
ALSO
CHECK
U1311.
/
VOLTAGES
A T U1311-2
AND
CHECK OP
AMP W311
A N D
PROTECTION
DIODES CRt301 AND
CR1302.
Fig
&7.
CHECK kR SWITCt
S2-F-1,2,3 ANQS2-F*
6 ;
ATTEFFUAT
SWLTCHES;
PRO71
TlON DIODES CR1
AND
CR1302;
R l r
AND W317.
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