Tuttnauer 1730EK, Technical Manual

Page: 52 / 111

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50
Corrections
—
Fix
connectio
ns.
—
Replace f
aulty cables.
—
Replace f
aulty connector.
—
Replace f
aulty connector.

Replace f
aulty power switch
Pos
sib
le ca
use ch
eck
-u
p and tes
ts
—
It is possible that the dual
power
supplies outp
uts 12V, b
ut t
he 5V
circuit is faulty. To i
dentify the faulty
item proceed
as follows:
—
Check the connection between the
two
electronic boards ANL-T2
and
DIG-
T2. —
Check the ca
ble, which transfers the
voltage from the AC-T1/JP2 connector to t
he power supply.
—
Check the input voltage of the electric box, at t
he AC-INPUT co
nnector, on
the AC-T1 bo
ard/JP3.
—
Check if there is no short-circuit at the AC-O
UTPU
T connector on the
AC-
T1 board (JP2). —
Check if there is no short-circuit at the input co
nnector (JP3) or at
the outp
ut
connector (JP5) on t
he ANL-T2
board.
1.6
Check the DC voltages supply t
o the sy
stem.

Check main power switch.
1.6.1
Check the groundi
ng
—
Plug con
nector 26
pin FL
AT of the
test board int
o connector J
P5 mounted
on b
oard ANL-T2.
—
Connect the n
egative probe of the
multitester to TP1 on t
he test board.
Symp
to
m
1. (cont.)