Service Guide
Page 14
YES CHECK KEY CONTROL CONNECTOR ROUTINE CHECK POWER NO BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO CHECK 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN114 (3.3V) VOLTAGE ? NO POWER NO POWER (POWER INDICATOR OFF) CHECK J705 VOLTAGE PIN5, PIN6 (5V)? CHECK 3.3V LINE CHECK X-TAL YES CHECK U201 PIN 122 PULSE YES CHECK U201 NO NO - 12 - TROUBLESHOOTING GUIDE 1. YES CHECK U501 PIN 8 Voltage (5V) ?
YES CHECK KEY CONTROL CONNECTOR ROUTINE CHECK POWER NO BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE NO CHECK 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN114 (3.3V) VOLTAGE ? NO POWER NO POWER (POWER INDICATOR OFF) CHECK J705 VOLTAGE PIN5, PIN6 (5V)? CHECK 3.3V LINE CHECK X-TAL YES CHECK U201 PIN 122 PULSE YES CHECK U201 NO NO - 12 - TROUBLESHOOTING GUIDE 1. YES CHECK U501 PIN 8 Voltage (5V) ?