Sanyo VHR-790 Service Manual page 11

2-2. VIDEO CIRCUIT RELAY JIG
2-2-1. TEST EQUIPMENT AND STANDARDS REQUIRED
Color Bar Signal Generator
PAL Color bar signel with 10OOA white level (EBU color bar signel)
Oscilloscope
Vertical sensitivity
:5 mV/DIV, external trigger
Bandwidth : more than 10 MHz
Oscilloscope Probe
Input capacity
: less than 25 pF (10:1)
less than 40 pF (1:1)
Covering frequency : DC - 4OMHZ(10:I)
DC -- 30 MHz(I:I)
Digital Voltmeter
DC range
Alignment Tape
VHJ-0008 or VHJ-0023 : SP mode, color bar, 1 kHz
(Color bar signal waveform is described below. Refer to Fig. 2-2-1)
Relay Jig
VHJ-O067 : 12-wire flat cable for VP-1 PWB assembly
ALIGNMENT TAPE COLOR BAR SIGNAL
'H.Sync Signal
Color bar signal waveform (VHJ-0008)
Fig. 2-2-1
wPv-TCP
(75%) –
m
v u
100%
White
Black
Color bar pattern (VHJ-0008) on monitor TV
Fig. 2-2-2
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-MP41GSY
(ea-
VP-1 PWB Assembly+\
Ralay Jig
VHJ-0067
/~
Cylinder
c Assembiv /1
Fig. 2-2-3
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