24
25
392 SERIES TROUBLE SHOOTING PROCEDURE
Step Problem Action to be Performed If Correct If Incorrect
13.
Set the Wahl Calibrator to 212°F
and insert into the T/C connector.
Use DVM to measure the follow-
ing voltages U3-12 should be .255
to .275V U3-13 should be .071 to
.079V
*U3-1 should be .580 to .620V
*U3-3 should be .660 to .710V
Proceed to
next meas-
urement.
If any voltage is
incorrect, check
R1-R17, R35,
R36, CR6 and
CR7. Also check
wires from con-
nector to circuit
board.
*U34 should be .660 to .710V
U3-14 should be .017 to .079V
U3-15 should be .580 to .620V
Proceed to
next step.
Replace U3 and
if problem is not
corrected, go to
Step 16.
14.
Check the output of U1-4 for a 0
to 6 volt square wave of approx.
10 kHz æ 2 kHz.
Replace CR1
and CR2.
Proceed to next
step.
15.
Check for a sawtooth wave at U1-
1. It should have a voltage level of
1.8 to +4.2 volts.
Replace U1.
If display
still reads
-OL-replace
U4.
Replace C67 and
recheck
U1-1. If problem
is not corrected
go to step 16.
16.
Return unit to factory for repair.
*NOTE: Does not apply to 392MX and 392M with Serial Numbers before N120
11.0 ACCESSORIES
392 SERIES CALIBRATORS
Model Number Usable With Meter Calibration Points
CAL392-HT
392E, 392EX, 392EVX,
392M, 392MX, 392VX
and 700M
-58°F, 32°F, 212°F, 284°F, 752°F
-50°C, 0°C, 100°C, 140°, 400°C
CAL392HP-HT 392HP only
CAL392-LT
392E, 392EX, 392EVX,
392M, 392MX, 392VX
Ice Point to Boil
Calibrator
32°F, 68°F, 104°F, 140°F, 212°
0°C, 20°C, 40°C, 60°C, 100°C
CAL392HP-LT
392HP only
Ice Point to Boil
Calibrator
392 SERIES METER ACCESSORIES
Model Number Description
DA-4 Silicone Paste
DA-6 Belt-Clip Meter Case with Hand Strap
DA-10 Nylon Safety Wrist Strap
DA-60 Shock-Proof attache-style Instrument Case
11681-1 Spare NiCad Battery Pack
11681-2 Spare NiCad Pack for -S Models
MN1604 Standard 9V Alkaline Battery
MA150 Battery Recharger, 120V AC 50/60Hz
MA150E Battery Recharger, 220V AC 50/60Hz, European
METER OPTIONS
392NIST
Certificate with 3 Standard Calibration Points between 32°F (0°C)
& 500°F (250°C) Meter calibration includes one probe.
392NIST-1
Certificate with 3 User-specified Calibration Points between -40°F
(-40°C) & 600°F (315°C) Meter calibration includes one probe.
(20 pagine)
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