Service Manual
Page 14
YES CHECK NO U501 PIN 8 VOLTAGE (5V) ? TROUBLESHOOTING GUIDE 1. YES 1 CHECK U201 PIN 96 PULSE YES CHECK U201 NO CHECK 3.3V LINE NO CHECK X-TAL Waveforms 1 U201-#96 - 14 - YES CHECK KEY CONTROL CONNECTOR ROUTINE CHECK POWER BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN90 (3.3V) VOLTAGE ? NO POWER NO POWER (POWER INDICATOR OFF) CHECK J705 NO VOLTAGE PIN5, PIN6 (5V)?
YES CHECK NO U501 PIN 8 VOLTAGE (5V) ? TROUBLESHOOTING GUIDE 1. YES 1 CHECK U201 PIN 96 PULSE YES CHECK U201 NO CHECK 3.3V LINE NO CHECK X-TAL Waveforms 1 U201-#96 - 14 - YES CHECK KEY CONTROL CONNECTOR ROUTINE CHECK POWER BOARD, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK 5VS LINE (OPEN CHECK) NO PROBLEM IS U201 PIN90 (3.3V) VOLTAGE ? NO POWER NO POWER (POWER INDICATOR OFF) CHECK J705 NO VOLTAGE PIN5, PIN6 (5V)?