IBM 6656HG2 Service Manual - Page 14

Troubleshooting Guide

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Page 14 highlights

TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK J801'S NO VOLTAGE (12V) ? YES CHECK X501'S WAVEFROM NO OSCILLATE AS 24MHZ ? YES CHECK U803 PIN 2, 3 NO WAVEFROM? 200kHz 12V YES 40% duty CHECK KEY CONTROL CONNECTOR ROUTINE CHECK ADAPTER, AND FIND OUT SHORT POINT OF EACH DC LINE OF 2.5V AND 3.3V CHECK X501. CHECK U803 AND L805'S OPEN - 14 -

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TROUBLESHOOTING GUIDE
1. NO POWER
CHECK X501.
CHECK
X501’S WAVEFROM
OSCILLATE AS
24MHZ ?
NO
NO POWER
(POWER INDICATOR OFF)
CHECK ADAPTER,
AND FIND OUT
SHORT POINT OF
EACH DC LINE OF
2.5V
AND 3.3V
CHECK J801’S
VOLTAGE
(12V) ?
NO
CHECK U803 AND
L805’S OPEN
CHECK
U803 PIN 2, 3
WAVEFROM?
NO
YES
YES
YES
CHECK KEY CONTROL
CONNECTOR ROUTINE
200kHz
40% duty
12V