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TROUBLESHOOTING & REPAIR |
MAIN TRANSFORMER AND OUTPUT CHOKE
REMOVAL AND REPLACEMENT (continued)
FIGURE F.17 — MAIN TRANSFORMER REMOVAL.
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LEAD
X1
OUTPUT
CHOKE POSITIVE 
LEAD
OUTPUT
CHOKE
LEAD
NOTE:
LEAD 
X4
LEADS
X2 AND X3
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MAIN
TRANSFORMER
POWER
ENHANCEMENT
CHOKE
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PROCEDURE
1.Disconnect main input power to the machine.
2.Remove the case side panels using a 3/8 in. nutdriver.
3.Test that the capacitors are discharged using a volt ohmmeter. Polarity must be observed.
4.Remove lead X1 from the left side SCR heat sink assembly using a 1/2 in. sock- et wrench, extender and universal adapter. See Figure F.17.
5.Remove lead X4 from the right side heat sink assembly using a 1/2 in. sock- et wrench, extender and universal adapter.
6.Remove the two transformer secondary leads X2 and X3 (braided copper strap) from the negative capacitor bank buss bar using two 1/2 in. open end wrench- es.
7.Disconnect and label all transformer leads from the reconnect panel using a 3/8 in. open end wrench.
8.Disconnect and label all leads from the input power switch.
9.Remove the power switch.
10.Disconnect thermostat leads #320 and #320B from the SCR Rectifier.