Block Diagram; Power Supply - Harman Kardon ca-260 Technical Manual

ALIGNMENT PROCEDURES
(REFER TO PAGES 9 AND 10 )
-Idling current adjustment
Conditions:
-Connect the DC
voltmeter between TPl and TP2 and
between TP3 and TP4.
-Connect a 13.
8V power supply to the 12V
Battery
Power In terminal.
-After the power on
, wait for 5 minutes before measur-
ing to be sure of the most stable operation.
Inspection:
-Confirm that the idling current is 50mA :t
20mA
(voltage: 33mV:t 13mV).
If the current measured does not fall within the range
specified
, adjust it with the procedure below.
Adjustment
Note: When replacing or disconnecting a resistor
, disconnect the power supply first.
Current
Voltage
Procedure
less than 29mA less than 19mV
Add R481 and R482 between TP5 and TP6 and between TP7 and TP8.
71mA ~ 100mA
46mV ~ 66mV
After cutting out R477 and R478 , add R481 and R482 between TP5
and TP6 and between TP7 and TP8.
101mA ~ 200mA
67mV ~ 132mV
After cutting out R479 and R480, add R481 and R482 between TP5
and TP6 and between TP7 and TP8.
201 mA ~ 250mA
133mV ~ 165mV
Cut out R477 and R478.
more than 251 mA
more than 166m V
Cut out R479 and R480.
After the adjustment is complete , let the unit settle down for 10 minutes
, than double-check that the idling current is set
properly.
BLOCK DIAGRAM
AMPLI FIER
Line Input
Output
High Level Input
Input
Select
Switches
FILTER
POWER
AMP
High/Low Pass
Fi Iter Switch
Input
Select
Line Input Switches
Output
FILTER
POWER
AMP
POWER SUPPLY
+13.
Switching
Circui t
+ 31.0V
Remote
- 31.0V
+ 35.
5 V
GND
- 35.
5 V
Protect Signa! Input
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