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Harman Consumer Group 250 Crossways Park Dr. Woodbury, New York 11797
Email Techsupport@harman.com
Web www.harmanservice.com
DPR 1005 / 2005 Block Diagram
A: Voltage Doubler and inrush
B: Over Voltage protect
C: Over Current protect
D: Over Current / Voltage protect
E: Multi Voltage SMPS
F: Mosfet Bridge
Figure 1
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Harman Consumer Group 250 Crossways Park Dr. Woodbury, New York 11797
Email Techsupport@harman.com
Web www.harmanservice.com
Operation summary
Applied AC line voltage for stand by.
AC line voltage from the re lay board goes to connector CN101 and supplies the
voltage for transformer (T101). T101 suppl ies standby and run voltages +18VAB,
ST5V H8.4V (AC for display). These are t he source voltages for the micro (IC62)
for stand by operation.
The applied AC flows through inrush resi stors R105 and R104 then rectified by
BD101 to charge C106 and C107. BD101 with C106 and107 are configured as
voltage doublers for 120 operation. Ju mper J102 is removed for 240 volt
operation. In either 120 or 240 volt operation 300 volts is developed for
secondary transformer T102.
Stand by to power on
When a High signal is received to connecto r P-S/W (from micro on main board)
Q201 turns on. Q201 controls optoisolator PC102. PC102 controls U101 at pin 3.
U101 is the driver IC for the SMPS that supplies run voltages +5VA, +5vd, +12V,-
12V, +18V, +24V, +44V for the main board.
Other activities at power on
When voltage is developed at D101 and C1 08 (off T102 of the SMPS) RL101
closes (Pins 3, 4 make contact) A shor t is produced across the in rush resistors
R105 and R104 (5W 15 -„¦) Current now flows through RL101 and not the inrush
resistors.
At the same time voltage is applied to relay SK41 (located on the Outlet Board
(rear relay board)). Its contacts are wir ed across the main power switch and is
used to prevent all the receivers current from flowing through the main power
switch (the switch is rated for 8amps, relay for 20 amps).
Power on
Once the secondary voltages are developed from T102 (smps), the micro \
sends
a signal to power on (4volt high) the high current SMPS used for the D2 audio
module (cn201 pin 11 P-CON, CN2 pin 1 PWR CNTR-2). IC U1 (PWM KA3525)
pin 10 goes low, and a PWM signal is devel oped to pins 11,14 (out A/B) to two
driver Transformers (T201, T202), then to a Mosfet Bridge to drive T103.
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