Nokia 105 Rm 908 Keypad Ways ((full))

The Nokia 105 (RM-908) keypad layout works on a matrix system where keys are grouped into specific rows and columns

• Row 1 (R1): Up, Down, Left, Right, OK
• Row 2 (R2): 1, 2, 3, Calling Key (Green)
• Row 3 (R3): 4, 5, 6, * (Star)
• Row 4 (R4): 7, 8, 9, # (Hash)
• Row 5 (R5): 0, End/Power Key (Red)
• Column 1 (C1): 1, 4, 7, *
• Column 2 (C2): 2, 5, 8, 0
• Column 3 (C3): 3, 6, 9, #
• Column 4 (C4): Up, OK, Green, Red/Power
• Column 5 (C5): Left, Right, Down, (Usually unassigned or Flashlight)

For precise jumper placement, referring to a hardware schematic or visual diagram is essential to avoid short-circuiting the board. nokia 105 rm 908 keypad ways

The Golden Rule: Every key has two points—a center point and an outer circle. The Nokia 105 (RM-908) keypad layout works on

: Measure the resistance at the center point of the non-working key. If no value (Open Line) is shown, the track is broken. : Often, simply cleaning the keypad PCB with Isopropyl Alcohol (IPA) resolves intermittent signal issues caused by debris. 3. Jumper Solutions (Hardware Repair) Row 1 (R1): Up, Down, Left, Right, OK

Key Groupings: Keys on this model are often grouped in rows or columns sharing a common line (e.g., keys 1, 2, and 3 often share a track). If an entire row fails, the fault is likely in a shared line leading to the main IC .

Common Keypad Faults in Nokia 105 RM-908

1. Single Key Dead: Usually a dirty contact or a broken track on that specific button.
2. Whole Row/Column Not Working: Indicates a break in a common trace (ROW or COLUMN line) or a missing voltage from the IC.
3. Keypad Lights On but No Function: Often a grounding issue or a corrupted firmware (rare).
4. Water Damage: Corroded vias and tracks require extensive jumper work.

• Example table format: Key | Row pad | Column pad 1 | R1 | C1 2 | R1 | C2 ...