JVC GD-V4210PZW Service Manual page 4

3. INSPECTION OF DATA ICS
According to the following procedures, measure with a circuit tester and check OK or NG.
Check the pin 4 or pin 5 of the connector [CN8] on the SIGNAL RELAY PWB (lower left).
Detac h the connecto r [CN8 ] or [CN9 ] on each of the SIGNA L
REL AY PWB s (fo r exampl e : lowe r lef t board ) and chec k the
conduction between the pin 4 (or pin 5) and the ground.
In case of "short" , one of the data ICs connectin g the SIGNAL
RELAY PWB may be defective, and you should check whether
ther e is an y trac e of damag e on th e dat a IC' s surfac e afte r
removing the heat-sink on the data IC.
4. INSPECTION OF POWER ICS
According to the following procedures, measure with a circuit tester and check OK or NG.
The allocation of power ICs to be checked is shown below.
4(No.51767D)
OK: Open
NG: Short
COMMON PWB
PH2001
PH2001
PH2001
SCAN PWB
PH2001
PH2003
PH2001
PH2004
PH2001
PH2002
PH2003