GH688,GA628, Standard Electrical Repairs
4/00021-2/FEA 209 544/1.G 36 (112)
• If VLCD voltage is missing, proceed to section 5.3.
• If the I
2
C-DATA or the I
2
C-CLOCK voltages are missing, check VDIG (~3.2V).
* If VDIG is incorrect, proceed to chapter 3 (“Doesn’t start”-fault).
* If VDIG is correct, measure the resistances of R619 (class A, 2.2 kohms),
R620 (class A, 2.2 kohms), R668 (class A, 10 kohms) and R669 (class A, 10
kohms). Make sure the solderings at D600 pads 3 and 4 are correct.
* If the resistances and the solderings are correct, replace D600 (class B).
Applies for KRC 114 279 (Seiko display):
Measure the voltages at the display pads H622 (fig. 5.5):
Table 5.2
• If VLCD is incorrect, proceed to section 5.3.
• If the I
2
C-DATA or the I
2
C-CLOCK voltages are missing, check VDIG (~3.2V).
* If VDIG is incorrect, proceed to chapter 3 (“Doesn’t start”-fault).
* If VDIG is correct, measure the resistances of R619 (class A, 2.2 kohms),
R620 (class A, 2.2 kohms), R668 (class A, 10 kohms) and R669 (class A, 10
kohms). Make sure the solderings at D600 pads 3 and 4 are correct.
* If the resistances and the solderings are correct, replace D600 (class B).
Pad # Used for Voltage
1 Not in use -
2
I
2
C Clock
~3.2V
3 GND 0V
4 VDIG ~3.2V
5 VLCD ~-2.8V
6
I
2
C Data
~3.2V
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