7-22
PROBLEM
CAUSE
ACTION
2. DATA DISORDER.
2. SYSTEM INITIAL AGAIN OR
DISCHARGE BATTERY.
3. SRAM OF MAIN BOARD DISORDER. 3. DISCHARGE SRAM AGAIN.
4. KEY BOARD FAILED.
4. REPLACE KEY BOARD.
5. MAIN BOARD FAILED.
5. REPLACE MAIN BOARD.
1. CARTRIDGE DETECT SENSOR
MALFUNCTION.
1. POWER RESET.
2. SYSTEM DATA DISORDER.
2. SYSTEM INITIAL AGAIN.
LCD DISPLAYED “NO
INK CARTRIDGE”
3. PRINTER BOARD FAILED.
3. REPLACE PRINTER BOARD.
7.26 NCU/TEL Board Trouble Shooting
7.26.1 Ringing
1. No ringing detection
à
Check the signal output at J4 pin6 (RING DET)
à
Check the status of D8, ZD5, ZD6, C10, R11, R12, PH1.
2. No ringing signal produced
à
Check the signal input at U1 pin21 (FCI)
à
Check the signal output at U1 pin8 (MO)
à
Check the status of C12, ZD7, R16, R17, and C13.
à
Check the status of ZD11, C36, R47, R46, D17
à
Check the wire connections from J8 and J5 to hook board., and R49.
7.26.2 Dialling
1. No dialling
à
Check the wire connections from J7 to keyboard.
à
Check the circuit from J7 to U1 pin13~20.
à
Check the status of S1.
2. DTMF dialling problem
à
Check the status of R40, R41, D15, and D16.
à
Check the status of R1 and C1.
3. Pulse dialling problem
à
Check the signal output at U1 pin 10 (HS/DP)
à
Check the status of R21, R22, R23, R24, Q5, Q6 and Q7.
à
Check the signal output at J4 pin14 (K1_DP)
à
Check the status of K1, K2, C4 and R5.
7.26.3 Handset function
1. Receiving problem
à
Check the status of R36, C28, C29, R34, L9 and L10.
à
Check the receiver inside handset.
2. Speech problem
Summary of Contents for TF-300P
Page 1: ...I TF 300P Field Service Manual Ver 02 July 8 1999 TTIC...
Page 12: ...1 7 1 3 General Appearance 1 3 1 Appearance 1 3 2 Show the operation panel...
Page 84: ...7 23 Check the status of C24 C25 C26 R32 R34 L11 and L12 Check the Microphone inside handset...
Page 100: ...9 1 9 MECHENICAL DRAWING AND PARTS LIST...
Page 101: ...9 2...
Page 102: ...9 3...
Page 103: ...9 4...
Page 104: ...9 5...
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Page 116: ...10 1 10 CIRCUIT DRAWING...
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