2
ICD-47
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 2
2. GENERAL ................................................................... 3
3. DISASSEMBLY
Disassembly Flow ........................................................... 4
Lid, Battery Case ............................................................ 4
“Case (Front) Section”, “Case (Rear) Section” ............. 4
MAIN Board ................................................................... 5
Installation “MAIN Board”,
“Microphone, Electric Condenser” (MIC101) ............... 5
4. TEST MODE.............................................................. 6
5. DIAGRAMS
5-1. Block Diagram ................................................................ 7
5-2. Printed Wiring Board ...................................................... 8
5-3. Schematic Diagram ......................................................... 9
5-4. IC Pin Function Description ........................................... 12
6. EXPLODED VIEW................................................... 15
7. ELECTRICAL PARTS LIST ............................... 16
CAUTION ON REPLACING FLASH MEMORY
The BAD-BLOCK check* must be executed, when the flash
memory (IC702) in this set was replaced.
The set will not operation normally, unless this check is finished.
* The BAD-BLOCK check detects an area (bad-block) in the flash
memory where data validity cannot be guaranteed, and saves this
information in the TOC-AREA so that a bad-block is not used.
BAD-BLOCK check Procedure:
1. Apply 1.5V from regulated power supply to the battery termi-
nals.
2. Once the power is supplied, the check starts and then proceeds
for approx. 45 seconds. (Be sure to keep applying the power
and pin yj or TP13 (green)/Pin yh or TP14 (red) signal “H”
during the check)
* Green/red LED of [OPR] indicator don't light up, therefore
it cannot be seen visually. Check the signal of pin yh , yj or
TP13, 14.
3. When the check completes, the result is shown as follows.
OK:Pin yh or TP14 signal “L” (Pin yj or TP13 Signal “H”)
NG:Pin yj or TP13 signal “H” (Pin yh or TP14 signal “L”)
4. In case of OK, press the [STOP] button.
Note:
• In case of NG, check system controller IC (IC701), flash memory IC
(IC702) and the peripheral circuit. (Particularly, check carefully the sol-
dering of the flash memory)
• After finishing the BAD-BLOCK check, assemble the set, load the dry
battery, and confirm if the set operates normally.
SECTION 1
SERVICING NOTES
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C dur-
ing repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board. (within 3 times)
• Be careful not to apply force on the conductor when soldering
or unsoldering.
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
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