Hitachi 61HDX98B Manual page 100

WAVEFORMS FOR DM-1 TROUBLESHOOTING (See Page 09-06 for DC Voltages)
After checking all the DC voltages between the DM-1 and the Main chassis, investigate the Waveforms.
Check on Connector PMS2 Pin 3 (IP. Request)
Check on Connector PMS2 Pin 4 (IP. Clock)
If measuring from any PMZ Connector as Reference, other that Ground, make sure the Scope isn't grounded.
Damage to the DM-1 module will occur. Reference Pin example: Pin 2,4,6,8,10, & 12
WAVEFORMS FOR DM-1 VIDEO TROUBLESHOOTING
(See Page 09-06 for DC Voltages)
Check on Connector PMT1 Pin 1 (Video NTSC)
Check on Connector PMS2 Pin 14 (NTSC Y)
Check on Connector PMS2 Pin 5 (IP. TX)
Waveform only available during Power On and Off
Check on Connector PMS2 Pin 6 (IP. RX)
WARNING!
Check on Connector PMS2 Pin 12 (NTSC V Cr)
Check on Connector PMS2 Pin 10 (NTSC U Cb)
Page 09-08