Circuit Description - Sherwood RX-4109B/B Service Manual

UPD78F0502M(T)5A4-A: IC301
1. Pin Description
PROTECT
VOL_DN
VOL_UP
REMOCON
P_CHECK
RESET
FLMDO
VREC
TREC
REGC
GND
VDD
NC
TUNED
L_MUTE

CIRCUIT DESCRIPTION

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
KEY2
29
KEY1
28 GND
27 Avref
26
FLT & PLL CLK
25
PLL_DI
24
FLT &PLL DA_OUT
23
FUNC_DA
22 FUNC_CLK
21 FLT_CE
20
PLL_CE
19
FUNC_CE
18
ST/BY_RLY & FLT B+
17 NC
16 ST/BY_LED