START
=?
I
REMOVE AlO7Jl. GROUND A107J1, PIN
I.
I
PRESS: BAND, 3, RESET, BAND, 1
TEST, 0, 9,
RESET(F1, RESET(F),
RESET(F), RESET(F), 3, CLEAR DISPLAY
LOOK AT
A107TP4. ISIT0 V*lOmV?
PRESS: TEST, 0,8,0,0,0,0
IS TP4 10V ?1V?
r
U9 OR 08 BAD.
v
CONNECT A POWER SUPPLY TO
A107J1 PIN 1. VARY THE
VOLTAGE SUCH THAT
A107TP3
VARIES ABOVE AND BELOW
GROUND. WHEN TP3 IS ABOVE
GROUND, IS
A107U14 PIN 7
A
TTL LOW, AND WHEN TP3 IS BE-
LOW GROUND
IS
A107U14 PIN 7
A
TTL HIGH 7
IS Ull PIN
6
THE SAME
VOLTAGE, BUT THE OPPOSITE
POLARITY, AS TP47
A107
U14A BAD.
-
I
U10 OR U11 BAD.
POWER METER
-
7
ZERO DAC BAD.
I
IS TP3 THE SAME VOLTAGE
AS TP4
?
I
U12 OR U13 BAD.
I
w
1
IS U14 PIN 1 A TTL LOW?
Figure 6-18. Power Meter
and
Power Meter Zero
DAC
I
I
YES NO
7
Scans by ArtekMedia © 2007
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