Harman Kardon AVR 235 (serv.man11) Service Manual ▷ View online
1
2
1
1. Removing the Top Cabinet
Remove the Screws
5
4
6
DISASSEMBLY
~
13
11
10
7
9
13
3
12
8
7
5
6
8
9
4
3
2
1
Remove the Screws
2. Removing the Front Panel
1
9
~
6
3
8
4
7
Remove the Screws
4. Removing the Main PCB
1
2
5
~
1
8
21
36
~
1
38
Remove the Screws
27
26
18
17
16
15
14
29
28
13
12
11
10
9
8
30
32
33
34 35
5
7
6
4
3
2
1 19 20
3. Removing the Rear Panel
24
22 23
25
31
AVR235/230
SAFETY PRECAUTIONS
The following check should be performed for the continued
protection of the customer and service technician.
protection of the customer and service technician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground (water
pipe, conduit, etc.) by connecting a leakage current tester
between the earth ground and all exposed metal parts of the
appliance (input/output terminals, screwheads, metal
overlays, control shaft, etc.). Plug the AC line cord of the
appliance directly into a 2
pipe, conduit, etc.) by connecting a leakage current tester
between the earth ground and all exposed metal parts of the
appliance (input/output terminals, screwheads, metal
overlays, control shaft, etc.). Plug the AC line cord of the
appliance directly into a 2
5
0V AC
5
0Hz outlet and turn the
AC power switch on. Any current measured must not exceed
o.5mA.
o.5mA.
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A
POTENTIAL SHOCK HAZARD AND MUST BE
CORRECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.
OUTLINED ABOVE ARE INDICATIVE OF A
POTENTIAL SHOCK HAZARD AND MUST BE
CORRECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.
Device
under
test
Test all
exposed metal
surfaces
exposed metal
surfaces
Also test with
plug reversed
(Using AC adapter
plug as required)
plug reversed
(Using AC adapter
plug as required)
AC Leakage Test
Leakage
current
tester
current
tester
Reading should
not be above
0.5mA
not be above
0.5mA
Earth
ground
ground
AMPLIFIER SECTION BIAS ADJUSTMENT
CUP11651Y
(
BIAS
PCB)
Measurement condition
. No input signal or volume position is minimum.
Standard value.
. Ideal current = 48mA (
±
5%)
. Ideal DC Voltage = 2
5
.
92
mV (
±
5%)
DC VOLTMETER..............Connect to CN
81
,CN
82
,CN
83
,CN
8
4,CN
8
5
,CN86,CN87
NO.
Channel
Adjust for
Adjustment
1 Front Left 2
5
.
92
mV (±5%) VR
83
CN
82
VR
86
2 Front Right 2
5
.
92
mV (±5%)
2
5
.
92
mV (±5%)
2
5
.
92
mV (±5%)
2
5
.
92
mV (±5%)
VR
84
CN
86
VR
82
3 Center VR
85
4 Surround Left VR
86
CN
81
VR
87
5 Surround Right VR
87
VR
81
CN
87
6
7
Surround Back Left
Surround Back Right
2
5
.
92
mV (±5%)
2
5
.
92
mV (±5%)
VR
82
VR
81
......
......
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