Panasonic UF-5500, Service Manual

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62
UF-5500 / 4500
6.13. Operation Board Section
The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array
(IC1) on Operation board and IC300 on Main board.
The key matrix table is shown below.
1. Key Matrix
a. Hard Scan
*LED7 should be set to KSL4. "8 x 5" key matrix is executed by hardware scanning.
b. Soft Scan
2. LED
• Active port---LED2 (IC1-36pin)
• Status---LED3 (IC1-37pin)
• Scan----LED4 (IC1-38pin) (UF-5500 only)
• Lower---LED5 (IC1-41pin)
KIN0 KIN1 KIN2 KIN3 KIN4 KIN5 KIN6 KIN7
KSL0 STOP COPY Lower S16/32 START S8/24 S14/30 S15/31
KSL1 3 6 S7/23 S6/22 9 # S5/21 S13/29
KSL2 2 5 MONITOR 8 0 S12/28 S11/27
KSL3 REDIAL/PAUSE Abbr Dial S2/18 S10/26 Set S9/25 S1/17
KSL4
(LED7) 1 4 7 S4/20 Flash/Sub addr
S3/19
SKIN0(XLED9) SKIN1(XLED10) SKIN2(XLED12)
SKS0
(LED6) Function Clear
SKS1
(LED8) SCAN
(UF-5500 only)
RESOLUTION
(UF-4500 only) RESOLUTION
(UF-5500 only) Contrast
CN2 CN511
IC300
ASIC
LCD MODULE
CN1
8x5
KEYS
MATRIX
(Hard)
3x2
KEYS
MATRIX
(Soft)
LED
MAIN BOARD OPERATION BOARD
GATE ARRAY IC
IC1