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© 2002 SCCE Training Group
Electrical faults
Contact service
If after connecting the power supply "contact service" appears on display, check following measurements:
Check VBB = 2.8V DC at U501 Pin 3(main enable voltage for MCU located on UI module).
Check PURX = 2.8 VDC at R301. If VBB and / or both signals not ok, check the board to board
connector J301 for mechanical damage or cold solderings. Change or resolder the connector, otherwise
check the VBB -/PURX - line on CMT module for shorts or disconnections.
Check Vbat = 4V DC at U501 Pin 1. If not ok, check VB line for shorts or disconnection.
Check UC_VCC = 2.8V DC at U501 Pin 5. If not ok, check regulator U501 and surrounding components for shorts or diconnections
and resolder or change the faulty components.
Check 32.768kHz (Vpp = 400mV) from Y301 at P308 / C316. (See picture below)
If no frequence is measureable check voltage at Y301 (Out: P308 = 2.15 VDC / In: C315 = 1.45 VDC). If voltage is ok, change
Y301. If the voltage is not ok, check MCU U301.
Note!
After connecting the power supply to the jig, the following measurements are only measureable for about 10
seconds.
Check DVCC = 2.8V DC at U502 Pin 5
Check CVCC = 1.6V DC at U505 Pin 5
Check AVCC = 2.8V DC at U503 Pin 5
Check USB_VCC = 3.1V DC at U506 Pin 4
Check DSP_RST = 2.8V DC at MCU U301 Pin 2
If no signals are measureable, check at all regulators Vbat = 4V DC and the enable signals (DVCC_ON e.g.)
DVCC_ON = 2.8V DC at U502 Pin 3, Vbat = 4V DC at Pin 1
CVCC_ON = 2.8V DC at U505 Pin 1, Vbat = 4V DC at Pin 5
AVCC_ON = 2.8V DC at U503 Pin 3, Vbat = 4V DC at Pin 1
USB_ON = 2.8V DC at U506 Pin 3, Vbat = 4V DC at Pin 1
If the enable signals not measureable probably the U301 MCU is faulty or the MCU SW is not working, then change the UI
module, because the MCU is not changeable yet.
npm_5_repair_v1_0.doc
CONFIDENTIAL
Product NPM-5
Introduction
Date 08.04.2002
Checked by:
SCCE Training Group
8(11)
Repairhints
Version 1.0 Approved
Approved by:
SCCE
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