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Sharp HC-4000 Service Manual page 12

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CHAPTER 4. DISASSEMBLY AND
ASSEMBLY
This chapter mainly describes the disassembly procedure. For as-
sembly, reverse the disassembly procedures. If any special care is
required for assembly, "Note for assembly" is provided.
Simple and easy replacement procedures of units and parts are omit-
ted.
[Flowchart of disassembly]
1 Memory PWB removal
2
Key bottom cabinet removal
3 Display unit and main PWB unit removal
4
Kry PWB unit removal
1 Memory PWB removal
1. Remove two screws 1 .
2. Remove ROM module cover 2 .
3. Remove one screw 3 .
4. Remove memory PWB 4 .
Battery box unit
B/U Battery cover
Pen unit
6 Key bottom cabinet disassembly
5 Display unit disassembly
7 Main PWB attachment process
1
2
3
4
[Note for assembly]
1. Memory PWB attachment screw tightening
1. memory PWB attachment screw tightening
1) Fit and connect the docking connector of the main PWB and the
docking connector of the memory PWB.
2) Hold the memory PWB and tighten the screw.
* Tightening torque is 1.5Kgf ⋅ cm ± 7%
Note 1) When connecting the docking connectors, fit the main side
and the memory side properly and connect.
If positioning is improper, they may be broken.
Note 2) When removing the memory PWB, remove it from section A
.
If it is removed from the other section, a stress is applied to
the docking connectors.
2. Module cover attachment screw tightening
2.Module cover attachment screw tightening
Memory PWB
Pawl insertion position
1) Insert two pawls of ROM module cover into the lower cabinet pawl
engagement positions to attach.
2) Tighten two ROM module attachment screws.
– 40 –
Docking connectors
Memory PWB
Screw hole
Screw hole
ROM module
cover
Pawl
Screw hole

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Hc-4100