REV.-A
Table 5-4. TAMA Board Unit Repair (Continued)
Problem Symptom
Cause
Check point
Solution
rhe Carriage The Carriage
IC
3B or
IC
At
IC
1A, check the input signal at pin 5
Replace 3B
)perates
does not op- IA is and the output waveform at pin 1 or 1A.
]bnormally.
crate at all defective.
Pin
1
Pin
5
+
I
50
v 5V
+
21r
s
Carriage op- The refer- Check transistor Q 17,
Q18
and Q19.
Replace
eration is
un- ence Volt-
Q17,
Q18
or
stable (lack age
generat-
Q19.
of torque) ing circuit is
faulty.
5-15
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