Pcb Diagnostic Chart - GMC Tech2 User Manual

Test
0 – Pass
RAM/ROM
1 – ROM read fail
2 – RAM read fail
3 – RAM write and read do
not compare
RS-485 Pass
loopback
Fail – Loopback may not be
connected
RS-232 Pass
loopback
Fail – Loopback may not be
connected
Keypad Test successful
Keypad failed
Exiting the test before all
keys are pressed results in a
failed keypad test.
PCMCIA Card detected
(Tests both Card not present
card slots)
Fail
Display User determines if display is
controller correct.
(Contrast and
Characters)
Sound User determines if
transducer transducer is working
Real-time Time is displayed correctly.
clock
Invalid values are displayed
for date, year, hour, minute,
or second
Diagnostic chart for Tech2 Main Printed Circuit Board (PCB)

PCB Diagnostic Chart

Results
General Motors Tech2 User Guide
Solution
Record type of failure.
Cycle Tech2 power (press
[PWR] and retest.
If problem persists, contact
Customer Support
Check loopback connection.
If problem persists, contact
Customer Support
Check loopback connection.
If problem persists, contact
Customer Support
Cycle Tech2 power and retest
If problem persists, contact
Customer Support
Check that card is inserted
properly.
Cycle Tech2 power and retest
If problem persists, contact
Customer Support
If the display shows a noticeable
failure during tests, contact
Customer Support
If no sound is emitted by
repeatedly selecting Automated
Test or Sound On, contact
Customer Support
Reset clock. Cycle Tech2
power and retest. If time is not
retained, contact Customer
Support
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