Panasonic GPH5D - Manual (Page 46)

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2. Listen to the buzz noise of the SC board; if the buzz noise is not present, a
malfunction of the SC-Board is suspected.
Suggestions: Check the Scan pulse waveform at
TPSC1. (Use TPSS1 of the SS-board to trigger
the oscilloscope.)
Verify the input signals at connector SC2, SC4,
SC20 and SC21.
Verify that the signals of the clock and serial data
lines from the D-board are present at connector
SC20 and SC21.
Figure 37
Figure 36