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Service Manual FILE No. Ultra-Low Temp. Freezer MDF-193 MDF-192(N) SANYO Electric Co., Ltd. Biomedical Business Division MDF 193AT RoHS This product does not contain any hazardous substances prohibited by the RoHS Directive. (You will find ‘RSF’ mark near the rating plate on the RoHS compliant product.) WARNING * You are requested to use RoHS compliant parts for maintenance or repair.
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Effective models This service manual is effective following models. Model name Product code Voltage and Frequency MDF-193 823 011 53 220V 60Hz 823 011 54 220/230/240V 50Hz MDF-192(N) 823 011 52 220V 50Hz...
Contents S p e c i f i c a t i o n s - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - S t r u c t u r a l s p e c i f i c a t i o n s - C o n t r o l s p e c i f i c a t i o n s - P e r f o r m a n c e s p e c i f i c a t i o n s...
Item MDF-193/192(N) In the event of any abnormality occurred among temp. sensor and comp. protect sensor, error code and chamber temperature are Self diagnosis function alternately displayed. ALARM lamp blinks, remote alarm activates and intermittent buzzer tone is emitted. The alarm buzzer is silenced by pressing alarm buzzer stop key...
Refrigeration Circuit Note : Ensure to charge gas from the charging point at EX tank. Cascade condenser Capillary tube Condenser shunt Pre-condenser Capillary tube Pre-condenser Capillary tube (EX) Compressor EX tank × Point to pull vacuum • • • •...
Connections on PCB Following table shows the connections on Temp. control PCB. Connector Connects to Usage Voltage 1- 2:10.3VAC To supply the power to Temp. 3:GND Power transformer control PCB. 4- 5:18.5VAC 1:6VDC To supply the power to alarm during #1-#2: Battery, Battery SW 2 GND power failure.
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Control specifications Keys on control panel BUZZER In alarm condition, buzzer stops sounding with this key pressed. Remote alarm output and alarm message would not be off. ALARM With this key pressed to activate alarm test mode to be forcibly step into alarm condition (ALARM lamp blinks and intermittent buzzer sounds).
Function mode Setting range : 00~32 Display range 00~39 00, 04, 05, 08~14, 16~20, 23, 26~31 and 33~39 are unused. Setting procedure : In chamber temperature display, keep pressing key over 5 seconds to enter function mode (F00 is displayed). Change the blinking 1 digit to desired function code with key and...
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Setting procedure: In chamber temperature display, keep pressing key over 5seconds to display “F00”. Input the desired function code with key and key. Press ENT key to be function mode available. Note) You should input service code in F06 prior to use F07, F15, F17, F21, F22, F24 and F32.
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F24: <Purpose> Display of chamber temperature (digit in decimal point is displayed) <Operation> In F24 displayed, press ENT key to display “000” (initial value) Change the value to “001” with key and press ENT key. Ex.) -85.1 Service code should be input in F06 prior to use this mode. F25: <Purpose>...
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Sensor error (1) Temp. sensor Open circuit: E01 and 50 are displayed alternately, the buzzer beeps intermittently and remote alarm contact outputs. The compressor would be allowed to turn on. Press BUZZER key to stop the buzzer beeping. Short circuit: E02 and -170 are displayed alternately, the buzzer beeps intermittently and remote alarm contact outputs.
Parts layout Front view Temperature display area Back side of temperature display area Display PCB Buzzer SW Back side of control panel Back-up test SW (AT type only) Back-up SW (AT type only) Power transformer Battery SW Power SW Switch PCB Control panel Power SW Temperature recorder...
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Lower part of left side Back side Comp. protect sensor Cascade Condensing fan motor Cover for claster Lower part of back side Claster Compressor Expansion tank Running capacitor Starting relay Temp. control relay Lower part of back side Electric BOX Starting capacitor Power cable Remote alarm terminal...
Test data AT30 Pull-down & Pull-up Temperture 1/2H 220V50Hz 1/2H 220V60Hz 1/2H (Pull-up -100 Time[hour] AT30 Pull-down Temperture 220V60Hz 1/2H 220V60Hz EVA OUT 220V60Hz EVA IN 220V60Hz -110 Time[hour] 1/2H 220V50Hz EVA OUT 220V50Hz EVA IN 220V50Hz -110 Time[hour]...
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AT35 Pull-down Current-Input 220V60H Input 220V60Hz Current 220V60Hz Time[hour] AT35 Pull-down Current-Input 220V50Hz Input 220V50Hz Current 220V50Hz Time[hour]...
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Temperature uniformity - 15 points measured (Reference data)
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Distribution data Temperature of the cycle in each area SV=-80 , air temperature) Amount of power consumption Unit: (SV-80 AT 20 Unit kWh/day 50Hz 60Hz AT 20 AT 30 50Hz 60Hz 50Hz 60Hz Mid of cycle Differential Mid of cycle Differential -73.3 -83.9...
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Distribution data Temperature of the cycle in each area SV=-70 , air temperature) Amount of power consumption Unit: (SV-70 AT 20 Unit kWh/day 50Hz 60Hz AT 20 AT 30 Differential Differential 50Hz 60Hz 50Hz 60Hz Mid of cycle Mid of cycle -63.4 -73.9 -68.7...