Arcam DiVA AVR250 User manual

DiVA Service
Manual
AVR250 AV Receiver
Issue 1.0
ARCAM
ARCAM
Bringing music & movies to life
Bringing music & movies to life

SERVICE MANUAL
v1.0
AVR250
SURROUND SOUND RECEIVER
CONTENTS Page
DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-28
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-40
IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41-50
ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51-80
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82-84
SERVICE PARTS ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

AVR250 SURROUND SOUND RECEIVER
- 2 -
DISASSEMBLY INSTRUCTIONS
7
6
5
1
3
2
4
9
8
8
2. Pull both sides of the TOP COVER slightly outwards 8 and tilt approx. 35° and then remove in the direction as
indicated by the arrow 9 . Refer to Figure No.2.
1. Remove machine screws M 4.0 x 6.0 ( 1 to 6 ) from the side panels.
Remove tapping screw 3.0 x 8.5 ( 7 )from the back panel.
Refer to Figure No.1.
Figure No.1
Figure No.2

- 3 -
AVR250 SURROUND SOUND RECEIVER
ADJUSTMENT POINTS DIAGRAM
AMP1 board

AVR250 SURROUND SOUND RECEIVER
- 4 -
AMP2 board
TUNER board
OSC RF
VT

- 5 -
AVR250 SURROUND SOUND RECEIVER
VIDEO board

AVR250 SURROUND SOUND RECEIVER
- 6 -
INSTRUMENT SETUP
1
.
FM
MEASUREMENT
Fig. 1
Fig. 2
2. RDS MEASUREMENT
Fig. 3
3. AM MEASUREMENT
Fig. 4
FM
SIGNAL
GENERATOR
ANTENNA
TERMINAL
OUTPUT
TERMINAL
DISTORTION
ANALYZER
DISTORTION
ANALYZER
AC
VOLTMETER
OSCILLOSCOPE
AC
VOLTMETER
OR
OSCILLOSCOPE
AC
VOLTMETER
OR
OSCILLOSCOPE
OUTPUT
TERMINAL
OUTPUT
TERMINAL
L
R
ANTENNA
TERMINAL
ANTENNA
TERMINAL
ANTENNA
TERMINAL
AM LOOP
ANTENNA
(Accessory)
AM LOOP
ANTENNA
60cm
DIGITAL
MILLIVOLT
METER
VT-J954
FM
SIGNAL
GENERATOR
AM
SIGNAL
GENERATOR
FM
SIGNAL
GENERATOR
RDS
GENERATOR
FM
STEREO
GENERATOR
P-901
DC
MILLIVOLT
METER
UNIT
UNIT
UNIT
UNIT
ALIGNMENT PROCEDURES
AMPLIFIER SECTION
Idle Current: Volume at min value, at 8 ohm and 10 min burn in
Step Item Connection Adjustment Adjust for
1FL Channel Voltmeter to P101 on AMP2 Board VR101 10mV±2mV
2 FR Channel Voltmeter to P401 on AMP1 Board VR401 10mV±2mV
3CChannel Voltmeter to P201 on AMP2 Board VR201 10mV±2mV
4SL Channel Voltmeter to P301 on AMP2 Board VR301 6mV±1.5mV
5 SR Channel Voltmeter to P501 on AMP1 Board VR501 6mV±1.5mV
6 BSL Channel Voltmeter to P701 on AMP1 Board VR701 6mV±1.5mV
7 BSR Channel Voltmeter to P601 on AMP1 Board VR601 6mV±1.5mV

- 7 -
AVR250 SURROUND SOUND RECEIVER
FM/RDS SECTION
- FM mono: 1kHz, 75kHz devi., 60dB/µV
- FM stereo: 1kHz, 67.5kHz devi., 60dB/µV
Pilot signal 19kHz 7.5kHz devi.
OUTPUTS
- Connect the non-inductive type resistor of 8 ohms to the all speaker terminals unless otherwise noted.
Item Step
Connec-
tion of
instru-
ment
FM SG output
Stereo
modula-
tor output
Tuning
frequency
Output
indicator
Adjustment
point Adjust for Remarks
FM
IF/RF
1
Fig.1
99.0MHz 1kHz
75kHz devi.
66dBf (60dB)
— 99.0MHz
DC volt-
meter L941 0±100mV FM MUTE/MODE
switch: ON/AUTO
Repeat the steps 1
to 3 until no further
adjustment is neces-
sary.
2AC volt-
meter
IFT on the
front end Maximum
3Distortion
analyzer L942 Minimum
Stereo
Distor-
tion
Fig.2
99.0MHz Ext.
mod. 66dBf
(60dB)
Channel
L or R
1kHz
99.0MHz Distortion
analyzer
IFT on the
front end Minimum
FM MUTE/MODE
switch: ON/AUTO.
Don’t turn more than
+/-180°.
Stereo
Sepa-
ration
Fig.2
99.0MHz Ext.
mod. 66dBf
(60dB)
Channel
L or R
1kHz
99.0MHz Oscillo-
scope R956
Maximum
Separa-
tion
Repeat stereo
distortion and stereo
separation align-
ment until THD at
minimum and sepa-
ration at maximum.
Muting
Level Fig.1 99.0MHz 22dB — 99.0MHz Oscillo-
scope R941 Signal
output
RDS Fig.3
99.0MHz Ext.
mod. 66dBf
(60dB) RDS
4% MOD
— 99.0MHz — — — Decode the RDS
Program Station.
AM SECTION
AM Modulation: 400Hz, 30%
For UL Version
Step AM SG output Tuning frequency Output indicator Adjustment point Adjust for
1— 530kHz Digital DC voltmeter QSC coil on RF block M971 1.35±0.2V
2
600kHz
400Hz 30% mod.
60dB/M
600kHz AC voltmeter RF coil on RF block M971 Maximum
3
600kHz
400Hz 30% mod.
60dB/M
990kHz AC voltmeter L972 Maximum
For CE Version
Step AM SG output Tuning frequency Output indicator Adjustment point Adjust for
1—522kHz or 531kHz Digital DC voltmeter QSC coil on RF block M971 1.35±0.2V (531kHz)
2
600kHz
400Hz 30% mod.
60dB/M
603kHz AC voltmeter RF coil on RF block M971 Maximum
3
600kHz
400Hz 30% mod.
60dB/M
999kHz AC voltmeter L972 Maximum

AVR250 SURROUND SOUND RECEIVER
- 8 -
VIDEO BOARD SECTION
1 Required measurement equipment : 100KHz Scope, DVD player
DVD test disc : TDV-540A
2 Connect the DVD Player into AVR250 composite Video IN; connect the component Video to TV (or connect 75 ohm
loading resistor).
3 Play TDV-540A T2-C1 (75% colour-bar UL NTSC / CE PAL).
4 Turn RV803 to adjust the component video Y voltage to 1000±75mV.
5 Turn RV804 to adjust the component video Cb voltage to 550mV±30mV.
6 Turn RV805 to adjust the component video Cr voltage to 600mV±30mV.

- 9 -
AVR250 SURROUND SOUND RECEIVER
IMPORTANT NOTES
1. Show the software version
Press “DVD” and “SAT” at the same time.
2. Light up all the icon on the VFL
Press “CD” and “TAPE” at the same time.
3. Reset
Press “FM MUTE” and “PRESET/TUNE” at the same time. When VFL shows “Resetl1 REQ?”, press “OK” button.
For CE version, the 9K/10KHz switch should be set to 9KHz and the voltage should be 230V AC.
For UL version, the 9K/10KHz switch should be set to 10KHz and the voltage should be 115V AC.
The 4/8 ohm switch should be set in 4ohm position in all version.
Ground-SW: GROUND.
4. Upgrade MCU software
The software of main CPU P89C669 can be upgraded via RS232. The programming steps are as follows:
• Connect the AVR250 to the computer.
• On AVR250, press the buttons ‘RDS INFO’ and ‘STORE’ at the same time. Then the front panel should display
‘Program Req..:’. Then press ‘OK’ button. Or you can press ‘RDS INFO’ and ‘STORE’ for 3 seconds. Front panel
will then display ‘Program..’. The AVR250 is ready to be programmed.
Note: when the program process is stopped unexpectedly, the program in IC may be erased. You can press these
two buttons for 3 seconds for programming.
• Run the ‘AVR250test.exe’ and click the button ‘Program to CPU’. Select the appropriate COM Port and click the
“Browse…” to load the hex file.
• Then click the button ‘Program’. Upon the upgrade process is completed, a pop window will be shown.
Note: Please try it again if there is error response.

AVR250 SURROUND SOUND RECEIVER
- 10 -
WIRING DIAGRAM
POWER PCB
SW PCB
PSU PCB
RECT PCB
PMAIN PCB
AMP2 PCB AMP1 PCB MULTI PCB
MAIN PCB
AUDIO PCB
TUNER PCB
DSP PCB
VIDEO PCB
KEY PCB
PHONE PCB
VOL PCB
LED PCB
COM PCB
CON1 PCB
CON2 PCB
Toroidal
Transformer
RS232 PCB
SP401
P/N: 1681-7000-A

- 11 -
AVR250 SURROUND SOUND RECEIVER
KEY board
PCB LAYOUT

AVR250 SURROUND SOUND RECEIVER
- 12 -
AMP2 board
component side

- 13 -
AVR250 SURROUND SOUND RECEIVER
AMP2 board
copper side

AVR250 SURROUND SOUND RECEIVER
- 14 -
AUDIO board component side
CON1 board component side
CON1 board copper side
SW board component side
SW board copper side

- 15 -
AVR250 SURROUND SOUND RECEIVER
AUDIO board copper side
VOL board PHONE board

AVR250 SURROUND SOUND RECEIVER
- 16 -
COM board component side COM board copper side
POWER board component side POWER board copper side
LED board component side LED board copper side
RECT board component side RECT board copper side

- 17 -
AVR250 SURROUND SOUND RECEIVER
CON2 board component side CON2 board copper side
PSU board

AVR250 SURROUND SOUND RECEIVER
- 18 -
DSP board component side

- 19 -
AVR250 SURROUND SOUND RECEIVER
DSP board copper side