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Service Bulletin 04004
MODELS : DTR-6.4,DTR-5.4
SUBJECT : The contents of memory return to the initial value or the control keys cannot operate.
Symptom: The contents of memory return to the initial setting or the control keys cannot operate.(In this case, please pull out and re-supply a power
cord at once (reset microprocessor), and confirm whether the contents of a memory have disappeared.)
Cause: Noise may join on the line of a clock and data from main microprocessor to a sub microprocessor, and a product may become the
symptom above.
Procedure for service: Replace the filters of R7095 and R7096 on the DSP printed Circuit Board NADG-7952. Replace with new part number 230955R2.
CIRCUIT NO. PART NAME SPEC. AFTER CHANGE NEW PART NO. AFTER
CHANGE
SPEC. BEFORE CHANGE ORIGINAL PART NO. BEFORE
CHANGE
R7095,R7096 EMI FILTER BK1608HS102-T 230955R2 BK1608LM182-T 230958R1
6/21/04
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