JVC TH-A30 Service Manual page 13

Description of major ICs
BA5954 (MU9) : Motor driver
1. Block diagram
28 27
STAND
+
-
-BY
THERMAL
SHUT DOWN
+ -
20k
-
+
7.5k
10k
1 2
2. Pin function
Pin No. Symbol
1 VINFC
2 CFCerr1
3 CFCerr2
4 VinSL +
5 VinSL -
6 VOSL
7 VNFFC
8 VCC
9 PVcc1
10 PGND
11 VOSL -
12 VOSL +
13 VOFC -
14 VOFC +
15 VOTK +
16 VOTK -
17 VOLD +
18 VOLD -
19 PGND
20 VNFTK
21 PVcc2
22 PreGND
23 VinLD
24 CTKerr2
25 CTKerr1
26 VinTK
27 BIAS
28 STBY
26 25 24 23 22
10k
PreGND
7.5k
10k
20k
2
7.5k
DET.AMP.
+ -
DET.AMP.
7.5k
2
+
-
10k
+ -
3 4 5 6 7
Function
Focus driver input
Capacitor connection terminal for error amplifier filter
Capacitor connection terminal for error amplifier filter
Operational amplifier input for thread driver (+)
Operational amplifier input for thread driver (-)
Operational amplifier output for thread driver
Focal driver return terminal
Pre VCC, thread driver part power VCC
Power
Loading driver part power VCC
Thread driver part output (-)
Thread driver part output (+)
Focus driver part output (-)
Focus driver part output (+)
Tracking driver output (+)
Tracking driver output (-)
Loading driver output (+)
Loading driver output (-)
Power GND
Tracking driver return terminal
Actuator driver part power VCC
Pre GND
Loading driver input
Capacitor connection terminal for error amplifer filter
Capacitor connection terminal for error amplifer filter
Tracking driver input
Bias input
Standby terminal
21 20 19 18 17 16 15
PV 2 PGND
CC
15k
LOADING ACTUATOR
-
DRIVER DRIVER
+
SLED ACTUATOR
DRIVER DRIVER
25k
V PV 1 PGND
CC CC
8 9 10 11 12 13 14
PV 1
CC
PV 2
CC
V
CC
TH-A30
1-13