Marantz PM-10 Service Manual

[C] PROT_4(FATAL,pin31) is the port for detecting a power amplier ab-
normality or SMPS abnormality
(1) Detection of an abnormality in the DC offset voltage from the Speaker Output terminal.
If the voltage from the Speaker Output terminal exceeds approximately 2.2V (DC), [Q9522, Q9523,
Q9521] will turn on, then the signal from the "PROT_4" will change to "Lo → Hi".
(2) Detection of a rapid drop of voltage in SMPS.
If SMPS ± HV falls below ± 27V, [Q9511, Q9521] turns on and "PROT_4" changes from "Lo → Hi".
When the abnormality mentioned in (1) or (2) is detected, "POW_1 : pin72" and "POW_2 : pin73"
change from "Hi → Lo" and power relay [S8501-S8503] immediately turns off and shuts down.
The STANDBY indicator ickers to inform that an error has occurred.
This protection operation is intended for when a breakdown of the Ampliers circuit or the SMPS occurs
and immediately shuts off the power in order to avoid the risk of damage.
To check whether the ampliers circuit or the SMPS is broken, turn off the unit, then wait for about 1
minute and turn it on again.
This action will deactivate the protection operation.
If the "PROT_4" remains in the "Hi"abnormal state, which constitutes an abnormality, the unit shuts
down approximately 4 seconds later and the STANDBY indicator starts ickering.
If the protection operation is not deactivated even after the power is turned on again, the ampliers
circuit or the SMPS may be broken.
[D] PROT_5(READY,pin40) is the port for detecting abnormalities in the
SMPS and power amplier
(1) Detection of an abnormality in the power ampliers power supply circuit ( ± HV).
If undervoltage (around 30V) or overvoltage (around 101V) is detected for the ± HV of the power
amplier power supply (SMPS), [Q6002, Q6005, Q7002 or Q7005] turns off and "PROT_5" changes
from "Lo → Hi".
(2) Detection of an abnormality in the power ampliers power supply circuit (VDR).
If undervoltage (around 13.5V) or overvoltage (around 19V) is detected for the VDR of the power
amplier power supply (SMPS), [Q6002, Q6005, Q7002 or Q7005] turns off and "PROT_5" changes
from "Lo → Hi".
(3) Detection of abnormal temperature increase in the power amplier.
If an abnormal temperature increase (around 90°C or higher) is detected near the thermistor of the
power amplier, [Q6002, Q6005, Q7002 or Q7005] turns off and "PROT_5" changes from "Lo → Hi".
(4) Detection of overcurrent in the power amplier.
When an overcurrent (around 26A or higher) is detected in the power amplier, [Q6002, Q6005,
Q7002 or Q7005] turns off and "PROT_5" changes from "Lo → Hi".
When the abnormality mentioned in (1) or (4) is detected, "POW_1 : pin72" and "POW_2 : pin73"
change from "Hi → Lo" and power relay [S8501-S8503] immediately turns off and shuts down.
The STANDBY indicator ickers to inform that an error has occurred.
This protection operation is intended for when a breakdown of the Ampliers circuit or the SMPS occurs
and immediately shuts off the power in order to avoid the risk of damage.
To check whether the ampliers circuit or the SMPS is broken, turn off the unit, then wait for about 1
minute and turn it on again.
This action will deactivate the protection operation.
If the "PROT_5" remains in the "Hi"abnormal state, which constitutes an abnormality, the unit shuts
down approximately 4 seconds later and the STANDBY indicator starts ickering.
If the protection operation is not deactivated even after the power is turned on again, the ampliers
circuit or the SMPS may be broken.
54
Caution in
servicing
Electrical Mechanical Repair Information Updating

Marantz PM-10 Specifications

General

Type	Integrated Amplifier
Frequency Response	5 Hz - 50 kHz
Total Harmonic Distortion	0.005%
Dimensions	440 x 168 x 453 mm
Weight	21.5 kg
Damping Factor	500
Available Colors	Silver, Black
Power Output	200W per channel (8Ω)
Input Sensitivity	220 mV / 22 kohm