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WAVEFORMS FOR DM-1 VIDEO TROUBLESHOOTING (Continued)
After checking all the DC voltages between the DM-1 and the Main chassis, investigate the Waveforms.
Check on Connector PM2 Pin 1 (Y 2.14)
=4x?
lO.OJ&
PMZ Pin 1 Using Pin 2 aa Rcfrence
Vp-p = 737.5 mV
Freq = 33.73kl-h
DC = -0.5Vdc
Check on Connector PM2 Pin 2 (Y. Ref)
PMZ Pin 2 Measured from Ground
Vp-p = 309.4
mV
Freq = 33.73kHz
DC = 0.24 Vdc
Vp-p = 4.03 mV Freq = 33.78 k&z
DC = -0.17 Vdr;
Check on Connector PM2 Pin 3 (2H Pr 2.14)
2rnD
5.
oog/
PMZ Pin 3 using Pin 4 as Reference
VP-p = 537.5 mV
Freq = 33.70
kHz
DC = -0.34 Vdc
Check on Connector PMZ Pin 3 (2H Pr 2.14)
PM2 Pin 3 Measured R-om Ground
WARNING!
If measuring from any PMZ Connector as Reference, other than 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
Check on Connector PMZ Pin 9 (V. Sync)
I.00"
5.OOp/
r
PMZ Pin 9 Measured Ram Ground
'i
Vp-p = 4.406
V Frcq = 59.97 Hz
DC = 0.03Vdc
Check on Connector PMZ Pin 11 (H. Sync)
I.OOV
,0.0-g/
PMZ Fin 11 Measured from Ground
H. dyne
Vp-p = 4.791 V Freq = 33.78 kHz
DC = 0.12 Vdc
Check on Connector PMZ Pin 5 (2H Pb 2.14)
2m'c
5.OOg/
PMZ Fin 5 using Fin 6 ae Reference
Vpp = 725.0 mV Freq = 33.79 kHz
DC = -0.34 Vdc
Check on Connector PMZ Pin 5 (2H Pb 2.14)
PMZ Pin 5 Measured from Ground
Vp-p = 396.9 mV Freq = 33.78 kHz
DC = -017 Vdc
I
PAGE 02-09
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