Sanyo VHR-757G Service Manual page 11

6 2-2. VIDEO CIRCUIT RELAY JIG
2-2-1. TEST EQUIPMENT AND STANDARDS REQUIRED
Color Bar Signal Generator PAL Color bar signel with 100% white level (EBU color bar signel)
Oscilloscope Vertical sensitivity
Bandwidth
Oscilloscope Probe Input capacity
Covering frequency
VHJ-0008 or VHJ-0023
: 5 mV/DIV, external trigger
::more than 10 MHz :
: less than 25 pF (10:1)
less than 40 pF (1:1)
: DC ~ 40 MHz (10:1)
DC ~ 30 MHz (1:1)
: SP mode, color bar, 1 kHz
(Color bar signal waveform is described below. Refer to Fig. 2-2-1)
: 12-wire flat cable for VP-1 PWB assembly
WPV-TCS
H.Sync Signal
Color bar signal waveform (VHJ-0008)
Fig. 2-2-1
WPV-TCP
3
3
&
> =
100%
ye | a |e
Color bar pattern (VHJ-0008) on monitor TV
Fig. 2-2-2
(75%)
RELAY JIG
Connect the flat cable end from the cylinder assembly to the
VP-1 PWB assembly using the relay jig to provide simple
repairing of the VP-1 PWB assembly, as shown in Fig.2-2-3.
Further, when adjusting the VP-1 PWB assembly, be sure to
make contact an end of shield case with bracket of the VP-1
PWB assembly to maintain the shield effect. If the VP-1 PWB
assembly does not contact, there is insufficient ground and no
proper play back image can be obtained.
RJ-MP4/GSY
Relay Jig
VHJ-0067
Flat Cable
Assembly
Fig. 2-2-3
=41=