TM  5-6115-332-14 P-8-614-14 TO    35C2-3-424-1 Adjust R6 accordingly to subparagraph d., (7), (c). Once  this  is  accomplished  there  are  no  further tests  required. (e) Should the voltage at terminals 20 and 21 of  TB1  remain  ON,  regardless  what  position  the 750  OHM  Rheostat  is  in,  then  proceed  with  the following   steps: NOTE This also applies if NO voltage is detected at terminals 20 and 21 of TB1. Turn   OFF   Electrical   Power spection and repair. before in- Step 1. Inspect the circuit board for burned or  broken  printed  circuit  paths.  Bridge  all  open  cir- cuit  paths  with  solid  22  AWG  wire,  making  certain that  adjacent  circuit  paths  are  not  shorted  by solder  flow. Step 2. If no open circuit paths or loose con nections of components exist, locate RI, R2, VR1 and VR2. With the 110-120 Volts AC Source con- nected to TB1, terminals 24 and 27, a reading of 28 Volts  DC  should  be  detected  with  Positive  polarity at R1 to VR1 junction, and Negative polarity at R2 to  VR2  junction. Step 3. If the voltage is lower or higher than 28  Volts  DC,  check  the  voltage  across  VR1  and CR2. CAUTION If either diode is removed from the cir- cuit board, do not apply the 110-120 AC Voltage Source at any time after diode is removed, until the replacement is con- nected to the circuit Failure to observe this precaution could cause the supply voltage  being  increased  beyond  a  max- imum  limit  for   ARI  causing   complete failure of the device. Step  4. After  checking  the  voltage  across each diode, replace either one of the two or both, that does not regulate the supply voltage to four- teen (14) DC Volts across each diode. 7 - 4 . 2 Change 3 Step 5. After replacing any one of the two (2) diodes  or  if  there  is  no  voltage  detected  across either  or  both  diodes,  check  the  AC  Voltage  bet- ween   terminal   lugs   7   and   8   of   TI   Power Transformer. NOTE Change setting of Multimeter to (AC Volt, 50 Volt range). Voltage  reading  between  36-40  Volts  AC  should  be present.  If  voltage  is  not  present,  T1  Power Transformer  should  be  checked  to  make  certain that  110-120  AC  input  voltage  is  connected  proper- ly, and all wiring connections to T1 are not loose or disconnected.  If  this  procedure  proves  all  wiring connections  to  be  correct,  replace  T1. Step 6. After verifying that 36-40 Volts AC present, locate CR5 and CR9 on the circuit board. Remove the 110-120 Volt AC voltage and discon- nect one end of each CR8, or CR9 nine (9) diodes. Set multimeter on the RX 10,000 OHMS scale. A good  diode  will  have  no  meter  movement  (High Resistance) with test leads applied, in any direc- tion  and  LOW  Resistance  with  test  leads  reversed. Remove and replace CR8, or CR9 if any of the two tests  prove  defective.  Install  serviceable  diodes. Step  7. Locate  Cl,  and  C2  on  the  reverse side  of  the  circuit  board.  With  one  end  of  each capacitor   disconnected   from   the   circuit   board, check  the  resistance  of  each  capacitor  with  the multimeter set for RX 10,000. Connect test lead of the multimeter to the POSITIVE scaled end of C 1. NOTE The meter pointer should deflect to the right  half  side  of  scale,  then  slowly return to somewhere past mid-scale toward left half of scale. If capacitor is shorted or leaky, the pointer will remain on the right lower half of the scale. If capacitor is Open there will be no move- ment of the pointer. Cheek C2 using the above method. Remove and replace Cl and (72, if found to be defective. If in doubt compare the tests of C1 and C2 with a new capacitor, using the results of the comparison for future tests.