Sony KV-32HS500 Training Manual page 13

CH2
.5v
100us
Waveform 2-1
The MS-INS is applied to the B Board/pin B3 and forwarded on to the MS1- Board. The MS-Data
signals are amplified on the HM-Board and then applied to the B Board/pins A4/B4 through A8/B8
where they are converted from differential format to single data lines, and further amplified and applied
to the MS1-Board.
The MS1 Board performs the following functions:
• Memory Stick® System Control
• JPEG Processing
• Memory Stick Decoding
The Memory Stick® JPEG data is then converted into digital Y, CB, CR data on the MS1 Board. The
digital Y, CB, CR data is then sent back to the B Board and is D/A converted to analog component video
signals (Y, CB and CR), which drive the CRT.
Troubleshooting Tips
1) All three boards (HM, Band MS1) are Not Field Repairable.
2) Confirm CN7202/pin 15 (MS-INS) goes low when Memory Stick® is inserted.
3) Confirm CN7202/pin 3 (3.3V supply).
4) Confirm CN7202/pins 5 through 14 have data activity during the following two events:
a. When the Memory Stick® is initially inserted; and
b. When an image is selected for display on the CRT.
5) Confirm the voltages and signals in steps 2, 3 and 4 are applied to CN3603/pins B3, A4/B4
through A8/B8 and B9.
6) If all voltages and signals are applied to the B Board, further troubleshooting will be board swap
due to inaccessibility to connectors on the B Board and MS1 Board.
There is not much signal processing performed on the B Board, so the most likely defect at this point
would be the MS1 Board.
MS - SDI (+)
CH2
.5v
100us
11
2. New Features (DA-4 Chassis)
Waveform 2-2
MS - SDI (-)