IDEAL INDUSTRIES 61-796, Technical Manual

Page: 10 / 11

Form number TM61796
Rev 2 May 2008
Page 8
Troubleshooting
Symptoms Possible Causes Remedies
No batteries Install the batteries
Faulty battery polarity Install the batteries in correct polarity
Battery terminal oxidized Replace new battery terminal
Wire broken
Solder wire
Q1 or Q8 broken Replace Q1 (IC-7809FA) or Q8 (IC-
78L05)
Poor contact of battery
harness Replace the battery contacts
The LCD has no display
Insufficient capacity of
battery Replace the batteries
Unable to measure due
to unclear LCD U4 or U21 broken Replace U4 (IC-27M2) or U21 (IC-
5106Q)
Digit incomplete U21 broken Replace U21 (IC-5106Q)
Vague font U4 broken Replace U4 (IC-27M2)
Reading not stable U21 or CON2 broken Replace U21 (IC-5106Q) or CON2
Power transformer broken Replace power transformer (PT-1505) Hz no reading
C6, C10 broken Replace C6 (CPE-220uF) C10 (CDM-
1uF)
C21 or Z2 broken Replace C21 (CPE-22uF) or Z2 (TVS-
6.5CA)
Fuse broken Replace Fuse
ACV no reading
U14 broken Replace U14 (IC-062)
ACV reading abnormal Diode broken Replace Diode
ACV ≠ 0 (no test) Z2 broken Replace Z2 (TVS-6.5CA)
Power transformer broken Replace power transformer (PT-1505)
L2 broken
Replace L2 (IND-254K)
Ω reading shows “1”
U4 broken Replace U4 (IC-27M2)
When measuring “ Ω ”
LED no indication
Q5 or Q6 broken Replace Q5 (TRA-A673) OR Q6
(TRA-A673)
When “2K Ω ” range, not
going to zero
U13 broken Replace U13 (IC-4053)
When “20 Ω ” range, not
going to zero
U3, Q6 broken Replace U3 (IC-LM358) Q6 (TRA-
A673)
When measuring “ Ω ”,
the reading drops
gradually
U3 broken Replace U3 (IC-LM358)
Unable to measure “ Ω ” Fuse broken
Replace Fuse