When Checking The Ditital Pcb; When Checking The Main Pcb - Yamaha YHT-196 Service Manual

HTR-2064/NS-B20/NS-C20/NS-SWP20
When checking the DIGITAL P.C.B.
• Put the rubber sheet and cloth over this unit, and place the DIGITAL P.C.B. on them. (Fig. 4)
• Connect ST201 on DIGITAL P.C.B. to the chassis with a ground lead or the like. (Fig. 4)
• Reconnect all cables (connectors) that have been disconnected. Be sure to use the P.C.B. CHECKING JIG (Part No.
WW483800) to connect between the following connectors.
CB263 on DIGITAL P.C.B. – CB196 on OPERATION (4) P.C.B.
CB264 on DIGITAL P.C.B. – CB195 on OPERATION (4) P.C.B.
• When connecting the flexible flat cable, be careful with polarity.
Rubber sheet and cloth
When checking the MAIN (1) P.C.B.
a. Remove the top cover. (Fig. 1)
b. Remove 3 screws ( ⑨ ). (Fig. 3)
c. Remove 5 screws ( ⑩ ) and 4 screws ( ⑪ ). (Fig. 5)
d. Place the P.C.B.s (with rear panel) upright. (Fig. 6)
e. Connect the heatsink, rear panel and MAIN (1) P.C.B. (G3) to the chassis with a ground lead or the like. (Fig. 6)
⑩ ⑪
⑩
20
ST201
Ground lead
⑩
Fig. 5
DIGITAL P.C.B.
CB263
CB264
P.C.B. CHECKING JIG
CB195
Chassis
Fig. 4
Rear panel
MAIN (1) P.C.B.
Heatsink
OPERATION (4) P.C.B.
CB196
Ground lead
G3
Chassis
Ground lead
Fig. 6