List Of Protection Information; Details Of Protection Information; Ps (Power Supply) Protection; Amplifier Dc Voltage Protection L/Rch - Yamaha A-S700 Service Manual

A-S700
•

List of protection information

The protection information is indicated by the
flashing pattern of the POWER indicator. (Fig. 2)
Types of protection function /
PS protection /
AMP DC protection L/R ch /
I protection L/R ch /
TMP protection L/R ch /
Normal
(no protection function) /
•

Details of Protection Information

a. PS (Power Supply) protection
Cause:
Normal value: 1.12 to 3.04V
Detection port: PRV (90 pin of microprocessor
Detected at:
b. Amplifier DC voltage protection L/Rch
Cause:
Normal value: 0.96 to 2.57V
Detection port: PRD (91 pin of microprocessor
Detected at:
20
Flashing 2 /
500mS 500mS
Flashing 4 /
500mS 500mS
Flashing 6 /
500mS 500mS
Flashing 7 /
500mS 500mS
Lit /
The voltage in the power sup-
ply section is abnormal.
IC602 of FUNCTION P.C.B.)
ACL, ACL2, +15, -15, +5S
Abnormal DC voltage of ampli-
fier output L/R
IC602 of FUNCTION P.C.B.)
PRDC (Amplifier output L/Rch
of MAIN P.C.B.)
POWER indicator flashing pattern /
500mS 1000mS 500mS 500mS
500mS 500mS 500mS 500mS 500mS
500mS 500mS 500mS 500mS 500mS
500mS 500mS 500mS 500mS 500mS
Continuous
Fig. 2
: Lit /
: Off /
500mS 1000mS 500mS 500mS
1000mS 500mS 500mS 500mS
500mS 500mS 500mS 500mS 1000mS
500mS 500mS 500mS 500mS 500mS 1000mS
500mS
500mS